Submission #896811

#	Time	Username	Problem	Language	Result	Execution time	Memory
896811		oblantis	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	143 ms	54192 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
#define all(v) v.begin(), v.end()
#define pb push_back
#define ss second
#define ff first
#define vt vector
using namespace std;
//using namespace __gnu_pbds;
typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<double, int> pdi;
const ll inf = 1e18 + 10000;
const int mod = 1e9+7;
const int maxn = 2e5 + 12;
void solve() {
	int n, m;
	cin >> n >> m;
	string s[n];
	int cnt[n][m + 1];
	for(int i = 0; i < n; i++) {
		cin >> s[i];
		cnt[i][m] = 0;
		for(int j = m - 1; j >= 0; j--){
			cnt[i][j] = cnt[i][j + 1];
			if(s[i][j] == 'O')cnt[i][j]++;
		}
	}
	ll ans = 0;
	for(int j = 0; j < m; j++){
		int I = 0;
		for(int i = n - 1; i >= 0; i--){
			if(s[i][j] == 'J')ans += cnt[i][j] * I;
			if(s[i][j] == 'I')I++;
		}
	}
	cout << ans;
}
int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int times = 1;
	//cin >> times;
	for(int i = 1; i <= times; i++) {
		solve();
	}
	return 0;
}

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