Submission #934380

#	Time	Username	Problem	Language	Result	Execution time	Memory
934380		SmuggingSpun	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	197 ms	18044 KiB

joi2019_ho_t1

#include<bits/stdc++.h>
#define taskname "ho-t1"
using namespace std;
typedef long long ll;
const int lim = 3005;
int r[lim];
char a[lim][lim];
int main(){
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	if(fopen(taskname".inp", "r")){
		freopen(taskname".inp", "r", stdin);
	}
	int n, m;
	cin >> n >> m;
	memset(r, 0, sizeof(r));
	for(int i = 1; i <= n; i++){
		for(int j = 1; j <= m; j++){
			cin >> a[i][j];
			if(a[i][j] == 'O'){
				r[i]++;
			}
		}
	}
	ll ans = 0;
	for(int j = 1; j <= m; j++){
		int cnt_i = 0;
		for(int i = 1; i <= n; i++){
			if(a[i][j] == 'I'){
				cnt_i++;
			}
		}
		for(int i = 1; i <= n; i++){
			if(a[i][j] == 'O'){
				r[i]--;
			}
			else if(a[i][j] == 'I'){
				cnt_i--;
			}
			else{
				ans += r[i] * cnt_i;
			}
		}
	}
	cout << ans;
}

Compilation message (stderr)

joi2019_ho_t1.cpp: In function 'int main()':
joi2019_ho_t1.cpp:11:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |   freopen(taskname".inp", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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