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답안 #935492

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
935492 2024-02-29T08:04:05 Z PM1 Sumtree (INOI20_sumtree) C++17
10 / 100
 86 ms 9692 KB 
#include <bits/stdc++.h>
using namespace std;
#define ll long long
const int mxn=5e5+5,M=1e9+7;
int n,q,r;
ll fuck[mxn],rfuck[mxn];
ll ferma(ll x){
	ll res=1,num=M-2;
	while(num){
		if(num&1)res=(res*x)%M;
		x=(x*x)%M;
		num/=2;
	}
	return res;
}
ll comb(ll x,ll y){
	return (((fuck[y]*rfuck[x])%M)*rfuck[y-x])%M;
}
int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	cout.tie(0);
	cin>>n>>r;
	fuck[0]=1;
	for(int i=1;i<mxn;i++){
		fuck[i]=(fuck[i-1]*i)%M;
		rfuck[i]=ferma(fuck[i]);
	}
	for(int i=1;i<=n-1;i++){
		int x,y;
		cin>>x>>y;
		//v[x].push_back(y);
		//v[y].push_back(x);
	}
	cout<<comb(n-1,n+r-1);
	cin>>q;
	while(q--){

	}
	return 0;
}

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 83 ms 9604 KB Output is correct
2 Correct 82 ms 9552 KB Output is correct
3 Correct 82 ms 9552 KB Output is correct
4 Correct 81 ms 9552 KB Output is correct
5 Correct 82 ms 9560 KB Output is correct
6 Correct 59 ms 8276 KB Output is correct
7 Correct 58 ms 8272 KB Output is correct
8 Correct 58 ms 8068 KB Output is correct
9 Correct 83 ms 9664 KB Output is correct
10 Correct 83 ms 9608 KB Output is correct
11 Correct 82 ms 9612 KB Output is correct
12 Correct 81 ms 9484 KB Output is correct
13 Correct 86 ms 9300 KB Output is correct

Subtask #2
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 58 ms 8020 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 82 ms 9692 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 83 ms 9436 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 30.0

# 결과 실행 시간 메모리 Grader output
1 Correct 83 ms 9604 KB Output is correct
2 Correct 82 ms 9552 KB Output is correct
3 Correct 82 ms 9552 KB Output is correct
4 Correct 81 ms 9552 KB Output is correct
5 Correct 82 ms 9560 KB Output is correct
6 Correct 59 ms 8276 KB Output is correct
7 Correct 58 ms 8272 KB Output is correct
8 Correct 58 ms 8068 KB Output is correct
9 Correct 83 ms 9664 KB Output is correct
10 Correct 83 ms 9608 KB Output is correct
11 Correct 82 ms 9612 KB Output is correct
12 Correct 81 ms 9484 KB Output is correct
13 Correct 86 ms 9300 KB Output is correct
14 Incorrect 58 ms 8020 KB Output isn't correct
15 Halted 0 ms 0 KB -