제출 #199765

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
199765		Mercenary	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	114 ms	89592 KiB

joi2019_ho_t1

#include<bits/stdc++.h>

#define pb push_back
#define mp make_pair
#define taskname "A"

using namespace std;

typedef long long ll;
typedef long double ld;
typedef pair<int,int> ii;
const int maxn = 3005;
string s[maxn];
int a[maxn][maxn] , b[maxn][maxn] , m , n;
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    if(fopen(taskname".INP","r")){
		freopen(taskname".INP", "r",stdin);
		freopen(taskname".OUT", "w",stdout);
    }
    ll res = 0;
    cin >> m >> n;
    for(int i = 0 ; i < m ; ++i)cin >> s[i];
    for(int i = m - 1 ; i >= 0 ; --i){
        for(int j = n - 1 ; j >= 0 ; --j){
            a[i][j] = a[i][j + 1] + (s[i][j] == 'O');
            b[i][j] = b[i + 1][j] + (s[i][j] == 'I');
        }
    }
    for(int i = 0 ; i < m ; ++i){
        for(int j = 0 ; j < n ; ++j){
            res += (ll)(s[i][j] == 'J') * a[i][j] * b[i][j];
        }
    }
    cout << res;
}

컴파일 시 표준 에러 (stderr) 메시지

joi2019_ho_t1.cpp: In function 'int main()':
joi2019_ho_t1.cpp:20:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen(taskname".INP", "r",stdin);
   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
joi2019_ho_t1.cpp:21:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen(taskname".OUT", "w",stdout);
   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

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