제출 #1023844

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1023844		vjudge1	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	144 ms	18004 KiB

joi2019_ho_t1

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define fi first
#define se second
#define task "code"
 
const int ar=3e3+5;
const ll mod=1e9+7;
int m,n;
char a[ar][ar];
int cnt[ar];
ll ans=0;
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
    if (fopen(task".inp","r"))
    {
        freopen(task".inp","r",stdin);
        freopen(task".out","w",stdout);
    }
    cin>>m>>n;
    for (int i=1;i<=m;i++)
    {
        for (int j=1;j<=n;j++)
        {
            cin>>a[i][j];
        }
    }
    for (int i=m;i>=1;i--)
    {
        int sum=0;
        for (int j=1;j<=n;j++)
        {
            if (a[i][j]=='J') sum+=cnt[j];
            else if (a[i][j]=='O')
            {
                ans+=sum;
            }
        }
        for (int j=1;j<=n;j++)
        {
            if (a[i][j]=='I') cnt[j]++;
        }
    }
    cout<<ans;
}

컴파일 시 표준 에러 (stderr) 메시지

joi2019_ho_t1.cpp: In function 'int main()':
joi2019_ho_t1.cpp:20:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   20 |         freopen(task".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
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(task".out","w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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