oj.uz

답안 #420768

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
420768 2021-06-08T13:47:24 Z qwerasdfzxcl Asceticism (JOI18_asceticism) C++14
0 / 100
 1 ms 252 KB 
#include <bits/stdc++.h>

typedef long long ll;
using namespace std;
const int MOD = 1e9+7;

ll pw(ll a, ll e){
    if (!e) return 1;
    ll ret = pw(a, e/2);
    if (e&1) return ret*ret%MOD*a%MOD;
    return ret*ret%MOD;
}

int main(){
    int n, k;
    scanf("%d %d", &n, &k);
    ll ans = 0, tmp = 1;
    for (int i=k;i;i--){
        ans += pw(i, n)*tmp;
        tmp = (-tmp*(n+1-k+i)%MOD)*pw(k-i+1, MOD-2)%MOD;
        if (tmp<0) tmp += MOD;
    }
    printf("%lld\n", ans);
    return 0;
}

Compilation message

asceticism.cpp: In function 'int main()':
asceticism.cpp:16:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |     scanf("%d %d", &n, &k);
      |     ~~~~~^~~~~~~~~~~~~~~~~

Subtask #1
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 252 KB Output is correct
2 Incorrect 1 ms 204 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 252 KB Output is correct
2 Incorrect 1 ms 204 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 252 KB Output is correct
2 Incorrect 1 ms 204 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 51.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 252 KB Output is correct
2 Incorrect 1 ms 204 KB Output isn't correct
3 Halted 0 ms 0 KB -