Submission #1146174

#	Time	Username	Problem	Language	Result	Execution time	Memory
1146174		zhasyn	Bitaro the Brave (JOI19_ho_t1)	C++20	100 / 100	87 ms	9544 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
#define pb push_back
#define pf push_front
using namespace std;
#define F first
#define S second
typedef long long ll;
#define pii pair <int, int>
#define pll pair <ll, ll>
typedef long double ld;
const ll N = 3000 + 100, M = 4096 + 10, len = 21, inf = 1e18;
const ll mod = 1e9 + 7;
ll cnt[N];
char a[N][N];
int main() {
  ios::sync_with_stdio(false);
  cin.tie(NULL);
  ll n, m, ans = 0;
  cin >> n >> m;
  for(ll i = 1; i <= n; i++){
  	string s;
  	cin >> s;
  	for(ll j = 1; j <= m; j++){
  		a[i][j] = s[j - 1];
  		if(a[i][j] == 'I') cnt[j]++;
  	}
  }
  for(ll i = 1; i <= n; i++){
  	ll sum = 0;
  	for(ll j = 1; j <= m; j++){
  		if(a[i][j] == 'I') cnt[j]--;
  		if(a[i][j] == 'J') sum += cnt[j];
  		if(a[i][j] == 'O')  ans += sum;
  	}
  }
  cout << ans;
  return 0;
}

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