feat: Add solutions for Codeforces problems 1997 A, B, C, and D
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ShazidMahsrafi
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2cbe3ba219
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70c8441a83
53
Codes/1997 A - Strong Password/1997A.cpp
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53
Codes/1997 A - Strong Password/1997A.cpp
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@ -0,0 +1,53 @@
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#include <bits/stdc++.h>
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using namespace std;
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#ifdef ONLINE_JUDGE
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#define dbg(...)
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#else
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#include "Assets/debug.h"
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#endif
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#define int long long
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#define ll long long
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#define endl '\n'
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#define ff first
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#define ss second
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#define ins insert
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#define pb push_back
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#define ppb pop_back
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#define sz(x) (int)(x).size()
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#define all(x) x.begin(), x.end()
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#define rep(i,a,b) for(int i=a; i<b; ++i)
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#define rrep(i,a,b) for(int i=a; i>=b; --i)
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#define yn(f) f? cout<<"YES\n":cout<<"NO\n"
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#define FAST (ios_base::sync_with_stdio(false), cin.tie(nullptr));
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ll pow(ll x,ll y,ll m=1e9+7) {ll ans=1;x%=m;while(y){if(y&1)ans=(ans*x)%m;x=(x*x)%m;y>>=1;}return ans;}
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void solve()
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{
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string s;
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cin>>s;
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for(int i=1; i<s.size(); ++i)
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{
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if(s[i]==s[i-1])
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{
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if(s[i]=='a') s.insert(s.begin()+i,'b');
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else s.insert(s.begin()+i,'a');
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cout<<s<<endl;
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return;
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}
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}
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if(s.back()=='a') s.append("b");
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else s.append("a");
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cout<<s<<endl;
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}
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signed main()
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{
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FAST;
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int TCS = 1;
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cin >> TCS;
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for (int TC = 1; TC <= TCS; ++TC)
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{
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// cout<<"Case "<<TC<<": ";
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solve();
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}
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}
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65
Codes/1997 B - Make Three Regions/1997B.cpp
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65
Codes/1997 B - Make Three Regions/1997B.cpp
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@ -0,0 +1,65 @@
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#include <bits/stdc++.h>
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using namespace std;
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#ifdef ONLINE_JUDGE
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#define dbg(...)
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#else
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#include "Assets/debug.h"
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#endif
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#define int long long
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#define ll long long
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#define endl '\n'
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#define ff first
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#define ss second
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#define ins insert
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#define pb push_back
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#define ppb pop_back
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#define sz(x) (int)(x).size()
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#define all(x) x.begin(), x.end()
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#define rep(i,a,b) for(int i=a; i<b; ++i)
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#define rrep(i,a,b) for(int i=a; i>=b; --i)
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#define yn(f) f? cout<<"YES\n":cout<<"NO\n"
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#define FAST (ios_base::sync_with_stdio(false), cin.tie(nullptr));
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ll pow(ll x,ll y,ll m=1e9+7) {ll ans=1;x%=m;while(y){if(y&1)ans=(ans*x)%m;x=(x*x)%m;y>>=1;}return ans;}
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void solve()
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{
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int n;
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cin>>n;
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vector<string>v(2);
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for(auto &i:v) cin>>i;
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dbg(n,v);
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int ans=0;
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rep(i,0,2)
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{
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rep(j,0,n)
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{
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int ct=0;
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if(j+1<n && v[i][j+1]=='.') ct++;
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if(j-1>=0 && v[i][j-1]=='.') ct++;
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dbg(ct);
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if(ct<2) continue;
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if(i==0)
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{
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if(v[i+1][j]=='.' && v[i+1][j-1]=='x' && v[i+1][j+1]=='x') ans++;
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}
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else
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{
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if(v[i-1][j]=='.' && v[i-1][j-1]=='x' && v[i-1][j+1]=='x') ans++;
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}
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}
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}
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cout<<ans<<endl;
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dbg(ans);
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}
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signed main()
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{
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FAST;
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int TCS = 1;
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cin >> TCS;
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for (int TC = 1; TC <= TCS; ++TC)
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{
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// cout<<"Case "<<TC<<": ";
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solve();
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}
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}
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72
Codes/1997 C - Even Positions/1997C.cpp
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72
Codes/1997 C - Even Positions/1997C.cpp
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@ -0,0 +1,72 @@
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#include <bits/stdc++.h>
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using namespace std;
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#ifdef ONLINE_JUDGE
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#define dbg(...)
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#else
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#include "Assets/debug.h"
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#endif
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#define int long long
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#define ll long long
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#define endl '\n'
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#define ff first
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#define ss second
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#define ins insert
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#define pb push_back
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#define ppb pop_back
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#define sz(x) (int)(x).size()
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#define all(x) x.begin(), x.end()
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#define rep(i,a,b) for(int i=a; i<b; ++i)
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#define rrep(i,a,b) for(int i=a; i>=b; --i)
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#define yn(f) f? cout<<"YES\n":cout<<"NO\n"
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#define FAST (ios_base::sync_with_stdio(false), cin.tie(nullptr));
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ll pow(ll x,ll y,ll m=1e9+7) {ll ans=1;x%=m;while(y){if(y&1)ans=(ans*x)%m;x=(x*x)%m;y>>=1;}return ans;}
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void solve()
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{
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int n;
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string s;
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cin>>n>>s;
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int ct=0,cost=0;
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vector<int>v;
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for(int i=0; i<n; ++i)
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{
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if(s[i]=='(')
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{
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ct++;
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v.push_back(i);
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}
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else if(s[i]==')')
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{
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ct--;
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cost += i-v.back();
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v.pop_back();
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}
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else
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{
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if(ct)
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{
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ct--;
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cost += i-v.back();
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v.pop_back();
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}
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else
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{
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ct++;
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v.push_back(i);
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}
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}
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}
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cout<<cost<<endl;
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}
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signed main()
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{
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FAST;
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int TCS = 1;
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cin >> TCS;
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for (int TC = 1; TC <= TCS; ++TC)
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{
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// cout<<"Case "<<TC<<": ";
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solve();
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}
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}
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61
Codes/1997 D - Maximize the Root/1997D.cpp
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61
Codes/1997 D - Maximize the Root/1997D.cpp
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#include <bits/stdc++.h>
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using namespace std;
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#ifdef ONLINE_JUDGE
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#define dbg(...)
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#else
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#include "Assets/debug.h"
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#endif
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#define int long long
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#define ll long long
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#define endl '\n'
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#define ff first
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#define ss second
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#define ins insert
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#define pb push_back
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#define ppb pop_back
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#define sz(x) (int)(x).size()
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#define all(x) x.begin(), x.end()
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#define rep(i,a,b) for(int i=a; i<b; ++i)
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#define rrep(i,a,b) for(int i=a; i>=b; --i)
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#define yn(f) f? cout<<"YES\n":cout<<"NO\n"
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#define FAST (ios_base::sync_with_stdio(false), cin.tie(nullptr));
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ll pow(ll x,ll y,ll m=1e9+7) {ll ans=1;x%=m;while(y){if(y&1)ans=(ans*x)%m;x=(x*x)%m;y>>=1;}return ans;}
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void solve()
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{
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int n;
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cin>>n;
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vector<int>adj[n], v(n);
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for(auto &i:v) cin>>i;
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rep(i,1,n)
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{
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int p;
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cin>>p;
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p--;
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adj[p].pb(i);
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}
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function<int (int node)> dfs = [&](int node)->int
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{
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int mn = INT_MAX;
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for(auto child:adj[node])
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mn = min(mn, dfs(child));
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dbg(mn);
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if(node == 0) return mn+v[0];
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if(mn == INT_MAX) return v[node];
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if(v[node] >= mn) return mn;
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return (mn+v[node])/2;
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};
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cout<<dfs(0)<<endl;
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}
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signed main()
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{
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FAST;
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int TCS = 1;
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cin >> TCS;
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for (int TC = 1; TC <= TCS; ++TC)
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{
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// cout<<"Case "<<TC<<": ";
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solve();
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}
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}
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@ -377,6 +377,10 @@ This repository contains my solutions of Codeforces problems. They are in C++ la
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| 365 | 1996 B | Scale | [Question](https://codeforces.com/problemset/problem/1996/B) | [Solution](https://github.com/ShazidMashrafi/Codeforces-Solutions/tree/master/Codes/1996%20B%20-%20Scale)
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| 366 | 1996 C | Sort | [Question](https://codeforces.com/problemset/problem/1996/C) | [Solution](https://github.com/ShazidMashrafi/Codeforces-Solutions/tree/master/Codes/1996%20C%20-%20Sort)
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| 367 | 1996 D | Fun | [Question](https://codeforces.com/problemset/problem/1996/D) | [Solution](https://github.com/ShazidMashrafi/Codeforces-Solutions/tree/master/Codes/1996%20D%20-%20Fun)
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| 368 | 1997 A | Strong Password | [Question](https://codeforces.com/problemset/problem/1997/A) | [Solution](https://github.com/ShazidMashrafi/Codeforces-Solutions/tree/master/Codes/1997%20A%20-%20Strong%20Password)
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| 369 | 1997 B | Make Three Regions | [Question](https://codeforces.com/problemset/problem/1997/B) | [Solution](https://github.com/ShazidMashrafi/Codeforces-Solutions/tree/master/Codes/1997%20B%20-%20Make%20Three%20Regions)
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| 370 | 1997 C | Even Positions | [Question](https://codeforces.com/problemset/problem/1997/C) | [Solution](https://github.com/ShazidMashrafi/Codeforces-Solutions/tree/master/Codes/1997%20C%20-%20Even%20Positions)
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| 371 | 1997 D | Maximize the Root | [Question](https://codeforces.com/problemset/problem/1997/D) | [Solution](https://github.com/ShazidMashrafi/Codeforces-Solutions/tree/master/Codes/1997%20D%20-%20Maximize%20the%20Root)
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