Submission #153282

#	Time	Username	Problem	Language	Result	Execution time	Memory
153282		mhy908	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	275 ms	159384 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
#define F first
#define S second
#define pb push_back
#define llinf 8987654321987654321
#define inf 1987654321
using namespace std;
typedef long long LL;
typedef pair<LL, LL> pll;
int n, m;
char arr[3010][3010];
LL dp1[3010][3010], dp2[3010][3010];
int main()
{
    scanf("%d %d", &n, &m);
    for(int i=1; i<=n; i++){
        scanf("%s", arr[i]+1);
    }
    for(int i=n; i>=1; i--){
        for(int j=1; j<=m; j++){
            if(arr[i][j]=='I')dp1[i][j]=dp1[i+1][j]+1;
            else dp1[i][j]=dp1[i+1][j];
        }
    }
    for(int i=1; i<=n; i++){
        for(int j=1; j<=m; j++){
            if(arr[i][j]=='J')dp2[i][j]=dp2[i][j-1]+dp1[i][j];
            else dp2[i][j]=dp2[i][j-1];
        }
    }
    LL ans=0;
    for(int i=1; i<=n; i++){
        for(int j=1; j<=m; j++){
            if(arr[i][j]=='O')ans+=dp2[i][j];
        }
    }
    printf("%lld", ans);
}

Compilation message (stderr)

joi2019_ho_t1.cpp: In function 'int main()':
joi2019_ho_t1.cpp:15:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~~
joi2019_ho_t1.cpp:17:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%s", arr[i]+1);
         ~~~~~^~~~~~~~~~~~~~~~

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