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added 1957C

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ShazidMahsrafi 2024-04-24 00:39:34 +06:00
parent 47fba30140
commit bb3c443352
2 changed files with 57 additions and 8 deletions
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51
Codes/1957 C - How Does the Rook Move/1957C.cpp Normal file
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#include<bits/stdc++.h>
#ifdef ONLINE_JUDGE
#define dbg(...)
#else
#include "debug.h"
#endif
using namespace std;
#define ll long long
#define endl '\n'
#define all(x) x.begin(), x.end()
#define sz(x) (int)(x).size()
#define yes cout<<"YES"<<endl
#define no cout<<"NO"<<endl
#define FAST (ios_base:: sync_with_stdio(false),cin.tie(NULL));
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;}
const int N=3e5+10, M=1e9+7;
int dp[N];
int func(int n)
{
if(n==0 || n==1)
return 1;
if(dp[n]!=-1) return dp[n];
dp[n]=(func(n-1)+(2ll*(n-1)*func(n-2))%M)%M;
return dp[n];
}
void solve()
{
int n,k;
cin>>n>>k;
memset(dp,-1,sizeof(dp));
int used=0;
for(int i=0; i<k; ++i)
{
int r,c;
cin>>r>>c;
used += 2-(r==c);
}
int m=n-used;
int ans=func(m);
cout<<ans<<endl;
}
signed main()
{
FAST;
int TC = 1;
cin >> TC;
while (TC--) solve();
}

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Readme.md
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@ -302,16 +302,14 @@ This repository contains my solutions of Codeforces problems. They are in C++ la
| 290 | 1956 C | Nene's Magical Matrix | [Question](https://codeforces.com/problemset/problem/1956/C) | [Solution](https://github.com/ShazidMashrafi/Codeforces-Solutions/tree/master/Codes/1956%20C%20-%20Nene's%20Magical%20Matrix)
| 291 | 1957 A | Stickogon | [Question](https://codeforces.com/problemset/problem/1957/A) | [Solution](https://github.com/ShazidMashrafi/Codeforces-Solutions/tree/master/Codes/1957%20A%20-%20Stickogon)
| 292 | 1957 B | A BIT of a Construction | [Question](https://codeforces.com/problemset/problem/1957/B) | [Solution](https://github.com/ShazidMashrafi/Codeforces-Solutions/tree/master/Codes/1957%20B%20-%20A%20BIT%20of%20a%20Construction)
| 293 | 1957 C | How Does the Rook Move | [Question](https://codeforces.com/problemset/problem/1957/C) | [Solution](https://github.com/ShazidMashrafi/Codeforces-Solutions/tree/master/Codes/1957%20C%20-%20How%20Does%20the%20Rook%20Move)
# Codeforces Solutions
This repository contains my solutions of Codeforces problems. They are in C++ language.
#### If this repository helped you out, please consider giving it a :star:
</div>
<div align="center">
## About Me :eyes:
## Index
#### Sorted by Problem ID
| Index | Problem ID | Problem Name | Question | Solution |
| :-----: | :--------: | :----------: | :------: | :------: |
I am Shazid Mashrafi.
I am currently studying Computer Science and Engineering & trying to work my way up in the programming world.
Visit my [Website](https://shazidmashrafi.com) and [Codeforces](https://codeforces.com/profile/ShazidMashrafi) account.