Submission #48228

#	Time	Username	Problem	Language	Result	Execution time	Memory
48228		lovemathboy	Asceticism (JOI18_asceticism)	C++14	49 / 100	1104 ms	262144 KiB

asceticism

#include <bits/stdc++.h>
using namespace std;

vector<vector<long long> > memo;
long long mod = 1000000007;
int n, k;

int main() {
    scanf("%d %d", &n, &k); k--;
    memo.resize(n+1);
    for (int i = 0; i <= n; i++) {
        memo[i].resize(k+1);
    }
    for (int i = 1; i <= n; i++) {
        if (i <= k) memo[1][i] = 0;
        memo[i][0] = 1;
    }
    for (int i = 1; i <= n; i++) {
        for (int j = 1; j <= k; j++) {
            memo[i][j] = (memo[i-1][j] * (j + 1) + memo[i-1][j-1] * (i - j)) % mod;
        }
    }
    printf("%lld\n", memo[n][k]);
    return 0;
}

Compilation message (stderr)

asceticism.cpp: In function 'int main()':
asceticism.cpp:9:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &n, &k); k--;
     ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 20 / 20
• Subtask 3: 25 / 25
• Subtask 4: 0 / 51