This is about 845B - Люба и билет from educational round 27.
My code got AC for C++14 34715622 and TLE for C++11 34715609. Can anyone tell me why? Diagnostics also TLEs, so I couldn't use that to check for undefined behaviour.
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This is about 845B - Люба и билет from educational round 27.
My code got AC for C++14 34715622 and TLE for C++11 34715609. Can anyone tell me why? Diagnostics also TLEs, so I couldn't use that to check for undefined behaviour.
I am stuck on this problem
Basically: p1 has N points, p2 has M points. They play N + M - 1 rounds. N, M ≤ 1000. The player who gets zero first loses.
p1 knows the probability of winning each round pi, the loser gets 1 point subtracted.
I can only think of dp in O((N+M)*N*M), but it gets TLE
int N, M;
cin >> N >> M;
vector<vector<double>> dp(N + 1, vector<double>(M + 1, 0.));
dp[N][M] = 1.;
for (int i = 0; i < N + M - 1; ++i) {
double p;
cin >> p;
for (int i = 0; i <= N; ++i) {
for (int j = 0; j <= M; ++j) {
if (i > 0 && j > 0) dp[i][j] = 0.;
if (j > 0 && i + 1 <= N) dp[i][j] += dp[i + 1][j] * (1. - p);
if (i > 0 && j + 1 <= M) dp[i][j] += dp[i][j + 1] * p;
}
}
}
double win = 0., lose = 0.;
for (int i = 1; i <= N; ++i) {
win += dp[i][0];
}
for (int j = 1; j <= M; ++j) {
lose += dp[0][j];
}
cout.precision(17);
cout << fixed << win / (win + lose) << "\n";
Any help is appreciated :)
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