Submission #1159701

#	Time	Username	Problem	Language	Result	Execution time	Memory
1159701		weakweakweak	Bitaro the Brave (JOI19_ho_t1)	C++20	100 / 100	117 ms	10284 KiB

joi2019_ho_t1

// g++ -Wall -Wextra -std=c++17 -o A A.cpp
#include <bits/stdc++.h>
using namespace std;
using ll = long long ;
using pii = pair<int,int>;
using pll = pair<ll, ll>;
#define fs first 
#define sc second
#define MP make_pair

int n, m;
string s[3010];
int colI[3010] = {0}, rowO[3010] = {0};
ll ans = 0;

int main() {
    ios_base::sync_with_stdio(false); cin.tie(0);
    cin >> n >> m;
    for (int i = 0; i < n; i++) {
        cin >> s[i];
        for (int j = 0; j < m; j++) {
            if (s[i][j] == 'O') rowO[i]++;
            if (s[i][j] == 'I') colI[j]++;
        }
    }
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            if (s[i][j] == 'O') rowO[i]--;
            if (s[i][j] == 'I') colI[j]--;
            if (s[i][j] == 'J') ans += rowO[i] * colI[j];
        }
    }
    cout << ans << '\n';
}

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 50 / 50