oj.uz

답안 #20053

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
20053 2016-02-25T08:55:38 Z tonyjjw 비트 (kriii4_Q) C++14
9 / 100
 2 ms 1176 KB 
//*
#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<algorithm>
#include<vector>
#define all(A) (A).begin(), (A).end()

using namespace std;

typedef long long ll;
typedef pair<int,int> pii;

const int MN = 100+10;
const ll mod = 1000000007;

ll mpow(ll a,ll p){
	ll r=1;
	while(p>0){
		if(p&1)r=r*a%mod;
		a=a*a%mod;
		p>>=1;
	}
	return r;
}

ll inv(ll a){
	return mpow(a,mod-2);
}

int N,K;
ll A[MN][MN];
ll tmp[MN];
ll iN;

int main(){
	scanf("%d%d",&N,&K);
	if(N==1)return !printf("1\n");
	iN=inv(N);
	for(int i=0;i<N;i++){
		if(i>0)A[i][i-1]=i*inv(N)%mod;
		A[i][i]=-1;
		A[i][i+1]=(N-i)*inv(N)%mod;
		A[i][N+1]=-1;
	}
	A[N][N]=1;
	A[N][N+1]=0;

	for(int i=0;i<=N;i++){
		if(A[i][i]==0){
			int p=-1;
			for(int j=i+1;j<=N;j++)if(A[j][i]==1)p=j;
			for(int j=0;j<=N+1;j++)swap(A[i][j],A[p][j]);
		}
		ll iv=inv(A[i][i]);
		for(int j=i;j<=N+1;j++){
			A[i][j]=A[i][j]*iv%mod;
		}
		for(int k=i+1;k<=N;k++){
			ll r=A[k][i];
			for(int j=i;j<=N+1;j++){
				A[k][j]=A[k][j]-r*A[i][j];
				A[k][j]%=mod;
			}
		}
	}
	for(int i=N;i>0;i--){
		for(int k=i-1;k>=0;k--){
			ll r=A[k][i];
			A[k][i]-=r*A[i][i];
			A[k][i]%=mod;
			A[k][N+1]-=r*A[i][N+1];
			A[k][N+1]%=mod;
		}
	}
	for(int i=N-1;i>=0;i--){
		ll ans=A[i][N+1];
		ans%=mod;
		ans=(ans+mod)%mod;
		printf("%lld\n",ans);
	}
	return 0;
}
//*/

Subtask #1
9.0 / 9.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 1176 KB Output is correct
2 Correct 1 ms 1176 KB Output is correct
3 Correct 0 ms 1176 KB Output is correct
4 Correct 0 ms 1176 KB Output is correct
5 Correct 2 ms 1176 KB Output is correct
6 Correct 0 ms 1176 KB Output is correct
7 Correct 0 ms 1176 KB Output is correct
8 Correct 0 ms 1176 KB Output is correct
9 Correct 0 ms 1176 KB Output is correct
10 Correct 0 ms 1176 KB Output is correct
11 Correct 0 ms 1176 KB Output is correct
12 Correct 1 ms 1176 KB Output is correct
13 Correct 0 ms 1176 KB Output is correct
14 Correct 0 ms 1176 KB Output is correct
15 Correct 0 ms 1176 KB Output is correct
16 Correct 0 ms 1176 KB Output is correct
17 Correct 0 ms 1176 KB Output is correct
18 Correct 0 ms 1176 KB Output is correct
19 Correct 0 ms 1176 KB Output is correct
20 Correct 0 ms 1176 KB Output is correct

Subtask #2
0.0 / 91.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 0 ms 1176 KB Output isn't correct
2 Halted 0 ms 0 KB -