Submission #19424

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
19424	2016-02-24 12:05:08	Qwaz	Ω (kriii4_P3)	C++14	100 / 100	0 ms	1084 KiB

P3

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#include <cstdio>
typedef long long ll;
const int MOD = 1000000007, MAX = 110;;
ll modpow(ll a, ll x) {
  ll ret = 1;
  a = a % MOD;
  while (x) {
    if (x & 1) ret = ret * a % MOD;
    a = a * a % MOD;
    x >>= 1;
  }
  return ret;
}
int p, q, n, k;
ll coeff[MAX], constant[MAX], val[MAX];
int main() {
  scanf("%d%d%d%d", &p, &q, &n, &k);
  if (k == 0) puts("0");
  else if (k == n) puts("1");
  else {
    ll x = q * modpow(p, MOD-2) % MOD;
    ll y = 1 - x;
 
 
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• Subtask 1: 100 / 100