Submission #513762

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
513762	2022-01-17 15:01:39	couplefire	Asceticism (JOI18_asceticism)	C++17	100 / 100	10 ms	1872 KiB

asceticism

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#include <bits/stdc++.h>
using namespace std;
 
using ll = long long;
const int N = 1e5+100;
const int MOD = 1e9+7;
 
ll powmod(ll a, ll b, ll r = 1) {
  while(b) {
    if(b & 1) r = r * a % MOD;
    a = a * a % MOD;
    b >>= 1;
  } return r;
}
 
ll fac[N], inv[N];
void prep() {
  fac[0] = 1;
  for(ll i = 1; i < N; i++)
    fac[i] = i * fac[i - 1] % MOD;
  inv[N - 1] = powmod(fac[N - 1], MOD - 2);
  for(ll i = N - 2; i >= 0; i--) 
    inv[i] = inv[i + 1] * (i + 1) % MOD;
}
 
ll C(int n, int r) {
  return fac[n] * (inv[r] * inv[n - r] % MOD) % MOD;
}
 
int main() {
 
 
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Compilation message (stderr)

asceticism.cpp: In function 'int main()':
asceticism.cpp:32:17: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |  int n, k; scanf("%d %d", &n, &k);
      |            ~~~~~^~~~~~~~~~~~~~~~~

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