oj.uz

답안 #935450

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
935450 2024-02-29T06:07:40 Z Mohammadamin__Sh Sumtree (INOI20_sumtree) C++17
10 / 100
 76 ms 25988 KB 
//In His Name
#include <bits/stdc++.h>
//#pragma GCC optimize("O3,unroll-loops")
//#pragma GCC target("avx2")
using namespace std;
#define ll long long
#define int ll
typedef pair<int, int> pii;
#define F first
#define S second
#define pb push_back
#define bug(x) cout << "Ah shit , here we go again : " << x <<endl
#define all(x) x.begin() , x.end()
const int maxn = 5e5 + 10, MOD = 1e9 + 7;
const ll INF = 1e18 + 100;

int n , r ,q  , fact[maxn];
vector<int> adj[maxn];

ll Power(ll x , ll y){
    if(y < 0 or x < 0) return 0;
    if(y == 0) return 1;
    ll tmp = Power(x , y/2);
    tmp = 1ll * tmp * tmp % MOD;
    if(y&1) tmp = 1ll * x * tmp % MOD;
    return tmp % MOD;
}

ll tarkib(int x , int y){
    if(x == 0 or x == y) return 1;
    if(x > y) return 0;
    ll zir = fact[x] * fact[y-x] % MOD;
    ll res = 1ll * fact[y] * Power(zir , MOD-2);
    return res%MOD;
}

int32_t main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0) , cout.tie(0);

    fact[0] = 1;
    for(int i = 1 ; i < maxn ; i++) fact[i] = (fact[i-1]*i) % MOD;

    cin >> n >> r;
    for(int i = 1 ; i <= n-1 ; i++){
        int u , v;
        cin >> u >> v;
        adj[u].pb(v);
        adj[v].pb(u);
    }
    cin >> q;
    cout << tarkib(n-1 , r+n-1) << '\n';
    //for(int i = 1 ; i <= q ;i++ ) cout << 1 << '\n';
}

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 68 ms 23380 KB Output is correct
2 Correct 62 ms 25872 KB Output is correct
3 Correct 61 ms 25688 KB Output is correct
4 Correct 65 ms 25860 KB Output is correct
5 Correct 57 ms 24880 KB Output is correct
6 Correct 8 ms 16216 KB Output is correct
7 Correct 8 ms 16220 KB Output is correct
8 Correct 7 ms 16220 KB Output is correct
9 Correct 76 ms 25756 KB Output is correct
10 Correct 60 ms 25940 KB Output is correct
11 Correct 72 ms 25988 KB Output is correct
12 Correct 64 ms 25424 KB Output is correct
13 Correct 59 ms 24660 KB Output is correct

Subtask #2
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 7 ms 15964 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 67 ms 23632 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 62 ms 23488 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 68 ms 23380 KB Output is correct
2 Correct 62 ms 25872 KB Output is correct
3 Correct 61 ms 25688 KB Output is correct
4 Correct 65 ms 25860 KB Output is correct
5 Correct 57 ms 24880 KB Output is correct
6 Correct 8 ms 16216 KB Output is correct
7 Correct 8 ms 16220 KB Output is correct
8 Correct 7 ms 16220 KB Output is correct
9 Correct 76 ms 25756 KB Output is correct
10 Correct 60 ms 25940 KB Output is correct
11 Correct 72 ms 25988 KB Output is correct
12 Correct 64 ms 25424 KB Output is correct
13 Correct 59 ms 24660 KB Output is correct
14 Incorrect 7 ms 15964 KB Output isn't correct
15 Halted 0 ms 0 KB -