Submission #288856

#	Time	Username	Problem	Language	Result	Execution time	Memory
288856		BeanZ	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	268 ms	159096 KiB

joi2019_ho_t1

#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define endl '\n'
const int N = 2e5 + 5;
char a[3005][3005];
ll col[3005][3005], row[3005][3005];
int main(){
        ios_base::sync_with_stdio(false);
        cin.tie(0);
        if (fopen("VietCT.INP", "r")){
                freopen("VietCT.INP", "r", stdin);
                freopen("VietCT.OUT", "w", stdout);
        }
        ll n, m;
        cin >> n >> m;
        for (int i = 1; i <= n; i++){
                for (int j = 1; j <= m; j++){
                        cin >> a[i][j];
                        col[i][j] = col[i - 1][j] + (a[i][j] == 'I');
                        row[i][j] = row[i][j - 1] + (a[i][j] == 'O');
                }
        }
        ll ans = 0;
        for (int i = 1; i <= n; i++){
                for (int j = 1; j <= m; j++){
                        if (a[i][j] == 'J'){
                                ans = ans + (row[i][m] - row[i][j]) * (col[n][j] - col[i][j]);
                        }
                }
        }
        cout << ans;
}
/*
*/

Compilation message (stderr)

joi2019_ho_t1.cpp: In function 'int main()':
joi2019_ho_t1.cpp:14:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   14 |                 freopen("VietCT.INP", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
joi2019_ho_t1.cpp:15:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   15 |                 freopen("VietCT.OUT", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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