initial commit

1901A Line Trip/1901A.cpp

@@ -0,0 +1,97 @@
+#include<bits/stdc++.h>
+using namespace std;
+
+// Short forms
+#define int                 long long
+#define ll                  long long
+#define lld                 long double
+#define ull                 unsigned long long
+#define endl                '\n'
+#define ff                  first
+#define ss                  second
+#define all(x)              x.begin(), x.end()
+#define sz(x)               (int)(x).size()
+#define pb                  push_back
+#define ppb                 pop_back
+#define mp                  make_pair
+#define ins                 insert
+
+// STLs
+#define PII                 pair<int, int>
+#define VI                  vector<int>
+#define VVI                 vector<vector<int>>
+#define SI                  set<int>
+#define SC                  set<char>
+#define MII                 map<int,int>
+#define VLL                 vector<ll>
+#define VVL                 vector<vector<ll>>
+#define SL                  set<ll>
+
+// Outputs
+#define yes                 cout<<"YES"<<endl
+#define no                  cout<<"NO"<<endl
+
+// Constants
+#define PI                  3.141592653589793238
+#define INF                 LONG_LONG_MAX
+#define MOD                 1e9+7
+
+// Faster Input Output
+#define FAST_IO             (ios_base:: sync_with_stdio(false),cin.tie(NULL));
+
+// Maths
+ll fact(ll n)          { if(n==0) return 1; ll res = 1; for (ll i = 2; i <= n; i++) res = res * i; return res; }
+ll nPr(ll n, ll r)     { return fact(n) / fact(n - r); }
+ll nCr(ll n, ll r)     { return fact(n) / (fact(r) * fact(n - r)); }
+ll gcd(ll a, ll b)     { if (b == 0) return a; return gcd(b, a % b); }
+ll lcm(ll a, ll b)     { return (a * b) / gcd(a, b);}
+ll mypow(ll a, ll b)   { ll ans = 1; while(b){ if (b&1) ans = (ans*a) ; b /= 2; a = (a*a); } return ans; }
+bool isPrime(ll n)     { if(n <= 1) return false; for(ll i = 2; i <= sqrt(n); i++) if(n % i == 0) return false; return true; }
+
+//Debugging
+#ifndef ONLINE_JUDGE
+#define dbg(x) cerr << #x <<" "; _print(x); cerr << endl;
+#define dbgin(x) cerr << #x <<" "; _print(x); cerr << "; ";
+#else
+#define dbg(x)
+#define dbgin(x)
+#endif
+ 
+void _print(int t) {cerr << t;}void _print(string t) {cerr << t;}void _print(char t) {cerr << t;}
+void _print(lld t) {cerr << t;}void _print(double t) {cerr << t;}void _print(ull t) {cerr << t;}
+template <class T, class V> void _print(pair <T, V> p);
+template <class T> void _print(vector <T> v);template <class T> void _print(set <T> v);
+template <class T, class V> void _print(map <T, V> v);template <class T> void _print(multiset <T> v);
+template <class T, class V> void _print(pair <T, V> p) {cerr << "{"; _print(p.first); cerr << ","; _print(p.second); cerr << "}";}
+template <class T> void _print(vector <T> v) {cerr << "[ "; for (T i : v) {_print(i); cerr << " ";} cerr << "]";}
+template <class T> void _print(set <T> v) {cerr << "[ "; for (T i : v) {_print(i); cerr << " ";} cerr << "]";}
+template <class T> void _print(multiset <T> v) {cerr << "[ "; for (T i : v) {_print(i); cerr << " ";} cerr << "]";}
+template <class T, class V> void _print(map <T, V> v) {cerr << "[ "; for (auto i : v) {_print(i); cerr << " ";} cerr << "]";}
+ 
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+void solve()
+{
+    int n,x;
+    cin>>n>>x;
+    VI v(n);
+    for(int i=0; i<n; ++i)
+        cin>>v[i];
+    int mx=0;
+    for(int i=1; i<n; ++i)
+    {
+        int dis=v[i]-v[i-1];
+        mx=max(mx,dis);
+    }
+    int ans=max(max(mx,2*(x-*--v.end())),*v.begin());
+    cout<<ans<<endl;
+}
+
+int32_t main()
+{
+    FAST_IO;
+    int TC = 1;
+    cin >> TC;
+    while (TC--) solve();
+}