Submission #642896

#	Time	Username	Problem	Language	Result	Execution time	Memory
642896		kdn5549	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	325 ms	159068 KiB

joi2019_ho_t1

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

typedef long long ll;
typedef pair<int,int> pi;
typedef pair<ll,ll> pl;

#define eb emplace_back
#define all(v) v.begin(),v.end()
#define ff first
#define ss second

const ll mxn=3005;

char a[mxn][mxn];
ll on[mxn][mxn],in[mxn][mxn];

int main()
{
    ios::sync_with_stdio(0); cin.tie(0);
    ll h,w; cin>>h>>w;
    for (int i=1;i<=h;i++)
    {
        for (int j=1;j<=w;j++)
        {
            cin>>a[i][j];
            if (a[i][j]=='O') on[i][j]++;
            if (a[i][j]=='I') in[i][j]++;
        }
    }
    for (int i=1;i<=h;i++) for(int j=1;j<=w;j++)
        {
            on[i][j]+=on[i][j-1];
            in[i][j]+=in[i-1][j];
        }
    ll rt=0;
    for (int i=1;i<=h;i++)
        for (int j=1;j<=w;j++)
            if(a[i][j]=='J')
            {
                rt+=(on[i][w]-on[i][j])*(in[h][j]-in[i][j]);
            }
            
    cout<<rt;
}

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