Submission #1150664

#	Time	Username	Problem	Language	Result	Execution time	Memory
1150664		nguyn	Bitaro the Brave (JOI19_ho_t1)	C++20	100 / 100	134 ms	9292 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
using namespace std;

#define ll long long 
#define F first
#define S second
#define pb push_back 
#define pii pair<int,int>

const int N = 2e5 + 5;

int n, m;
char a[3005][3005]; 

ll f[3005];

signed main(){
    ios_base::sync_with_stdio(false) ; 
    cin.tie(0) ; cout.tie(0) ; 
    if (fopen("INP.INP" ,"r")) {
        freopen("INP.INP" ,"r" , stdin) ;
        freopen("OUT.OUT" , "w" , stdout) ;
    }
    cin >> n >> m;
    for (int i = 1; i <= n; i++) {
    	for (int j = 1; j <= m; j++) {
    		cin >> a[i][j]; 
    	}
    }
    ll res = 0; 
    for (int i = 1; i <= n; i++) {
    	for (int j = 1; j <= m; j++) {
    		if (a[i][j] == 'I') res += f[j]; 
    	}
    	int cnt = 0; 
    	for (int j = m; j >= 1; j--) {
    		if (a[i][j] == 'O') {
    			cnt++; 
    		}
    		if (a[i][j] == 'J') {
    			f[j] += cnt; 
    		}
    	}
    }
    cout << res;
}

Compilation message (stderr)

joi2019_ho_t1.cpp: In function 'int main()':
joi2019_ho_t1.cpp:21:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |         freopen("INP.INP" ,"r" , stdin) ;
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
joi2019_ho_t1.cpp:22:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   22 |         freopen("OUT.OUT" , "w" , stdout) ;
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

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