Submission #164968

#TimeUsernameProblemLanguageResultExecution timeMemory
164968coloredrabbitΩ (kriii4_P3)C++17
0 / 100
2 ms376 KiB
#include <cstdio> using ll = long long; const ll MOD = 1e9+7; ll _pow(ll a, int n) { if (n <= 1) return n % 2 ? a : 1; ll h = _pow(a, n >> 1); return ((h * h) % MOD) * (n % 2 ? a : 1) % MOD; } ll gcd(ll p, ll q) { return !q ? p : gcd(q, p % q); } ll rev(ll x) { return _pow(x, MOD - 2); } int main() { int P, Q, N, K; ll v, ans = 0, A, B, g, X; scanf("%d%d%d%d", &P, &Q, &N, &K); if (K == 0 || Q == P) puts("0"); else if (K == N || Q == 0) puts("1"); else { if(2*Q == P) ans = K * rev(N) % MOD; else { v = Q * rev(P - Q); ans = ((1 - _pow(v, K) + MOD) % MOD) * (rev(1 - _pow(v, N) + MOD) % MOD) % MOD; } printf("%lld", ans); } return 0; }

Compilation message (stderr)

P3.cpp: In function 'int main()':
P3.cpp:13:17: warning: unused variable 'A' [-Wunused-variable]
  ll v, ans = 0, A, B, g, X;
                 ^
P3.cpp:13:20: warning: unused variable 'B' [-Wunused-variable]
  ll v, ans = 0, A, B, g, X;
                    ^
P3.cpp:13:23: warning: unused variable 'g' [-Wunused-variable]
  ll v, ans = 0, A, B, g, X;
                       ^
P3.cpp:13:26: warning: unused variable 'X' [-Wunused-variable]
  ll v, ans = 0, A, B, g, X;
                          ^
P3.cpp:14:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%d%d", &P, &Q, &N, &K);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
#Verdict Execution timeMemoryGrader output
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