Submission #990080

#TimeUsernameProblemLanguageResultExecution timeMemory
990080coftochkaBitaro the Brave (JOI19_ho_t1)C++17
20 / 100
9 ms15196 KiB
#include <iostream> #include <cstring> using namespace std; const int N = 3030; int O[N][N]; int I[N][N]; string s[N]; int n, m; void input(){ cin >> n >> m; for (int i = 0; i < n; ++i){ cin >> s[i]; } } void preprocess(){ for (int i = 0; i < n; ++i){ O[i][m] = 0; for (int j = m - 1; j >= 0; --j){ O[i][j] = O[i][j + 1]; if (s[i][j] == 'O'){ ++O[i][j]; } } } for (int j = 0; j < m; ++j){ I[n][j] = 0; for (int i = n - 1; i >= 0; --i){ I[i][j] = I[i + 1][j]; if (s[i][j] == 'I'){ ++I[i][j]; } } } } int solve(){ long long ans = 0; for (int i = 0; i < n; ++i){ for (int j = 0; j < m; ++j){ if (s[i][j] == 'J'){ ans += O[i][j] * I[i][j]; } } } return ans; } int main(){ input(); preprocess(); cout << solve(); }
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