Submission #120125

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
120125	2019-06-23 13:38:02	arman_ferdous	Asceticism (JOI18_asceticism)	C++17	49 / 100	134 ms	150904 KiB

asceticism

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#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int N = 3e3+100;
const int MOD = 1e9+7;
ll dp[N][N];
ll DP(int n, int k) {
  if(k > n) return 0;
  if(k == 1 || k == n || n == 1) return 1;
  if(dp[n][k] != -1) return dp[n][k];
  dp[n][k] = ((ll)(n - k + 1) * DP(n - 1, k - 1) % MOD) + ((ll)k * DP(n - 1, k) % MOD);
  if(dp[n][k] >= MOD) dp[n][k] -= MOD;
  return dp[n][k];
}
int main() {
  memset(dp, -1, sizeof dp);
  int n, k; scanf("%d %d", &n, &k);
  printf("%lld", DP(n, k));
  return 0;
}
 
 
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Compilation message (stderr)

asceticism.cpp: In function 'int main()':
asceticism.cpp:20:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  int n, k; scanf("%d %d", &n, &k);
            ~~~~~^~~~~~~~~~~~~~~~~

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