Submission #1289177

#	Time	Username	Problem	Language	Result	Execution time	Memory
1289177		muhammad-ahmad	Bitaro the Brave (JOI19_ho_t1)	C++20	100 / 100	137 ms	150428 KiB

joi2019_ho_t1

// #include <bits/stdc++.h>
#include <iostream>
#include <cmath>
#include <algorithm>
#include <map>
#include <vector>
#include <iomanip>
#include <string>
#include <queue>
#include <set>
#include <deque>
#include <numeric>
#include <stack>
#include <chrono>
using namespace std;

#define int long long
#define endl '\n'
#define all(v) (v).begin(), (v).end()
#define rall(v) (v).rbegin(), (v).rend()
#define fi first
#define Se second

void fast_io() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    cout << fixed << setprecision(9);
}

void solve() {
	int n, m; cin >> n >> m;
	string s[n + 1];
	for (int i = 1; i <= n; i++){
		cin >> s[i];
		s[i] = "." + s[i];
	}
	
	int O[n + 1][m + 1] = {}, I[n + 1][m + 1] = {};
	
	for (int i = 1; i <= n; i++){
		for (int j = 1; j <= m; j++){
			O[i][j] = O[i][j - 1] + (s[i][j] == 'O');
			I[i][j] = I[i - 1][j] + (s[i][j] == 'I');
		}
	}
	
	int ans = 0;
	
	for (int i = 1; i <= n; i++){
		for (int j = 1; j <= m; j++){
			if (s[i][j] == 'J') ans += (I[n][j] - I[i][j]) * (O[i][m] - O[i][j]);
		}
	}
	
	cout << ans << endl;
	
	return;
}

signed main() {
    fast_io();
    srand(chrono::steady_clock::now().time_since_epoch().count());
    int tc = 1;
    // cin >> tc;
    while (tc--) solve();
    return 0;
}

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