Submission #514933

#	Time	Username	Problem	Language	Result	Execution time	Memory
514933		status_coding	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	278 ms	161560 KiB

joi2019_ho_t1

#include <iostream>

using namespace std;

long long n,m,ans;
string s[3005];

long long dpR[3005][3005];
long long dpD[3005][3005];

int main()
{
    cin>>n>>m;
    for(int i=0;i<n;i++)
        cin>>s[i];

    for(int i=n-1;i>=0;i--)
        for(int j=m-1;j>=0;j--)
        {
            dpR[i][j]=dpR[i][j+1] + (s[i][j] == 'O');
            dpD[i][j]=dpD[i+1][j] + (s[i][j] == 'I');

            if(s[i][j] == 'J')
                ans += dpR[i][j] * dpD[i][j];
        }

    cout<<ans;
    return 0;
}

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