Submission #855762

#	Time	Username	Problem	Language	Result	Execution time	Memory
855762		annabeth9680	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	163 ms	160940 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
#define int long long
using namespace std;
const int MAXN = 3010;
string grid[MAXN];
int cntI[MAXN][MAXN], cntO[MAXN][MAXN];
int32_t main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int H,W; cin >> H >> W;
    for(int i = 0;i<H;++i){
        cin >> grid[i];
    }
    for(int i = 0;i<H;++i){
        int os = 0;
        for(int j = W-1;j>=0;--j){
            if(grid[i][j] == 'J'){
                cntO[i][j] = os;
                //cout << i << " " << j << " " << cntO[i][j] << "\n";
            }
            else if(grid[i][j] == 'O') os++;
        }
    }
    for(int i = 0;i<W;++i){
        int is = 0;
        for(int j = H-1;j>=0;--j){
            if(grid[j][i] == 'J'){
                cntI[j][i] = is;
                //cout << j << " " << i << " " << cntI[j][i] << "\n";
            }
            else if(grid[j][i] == 'I') is++;
        }
    }
    int ans = 0;
    for(int i = 0;i<H;++i){
        for(int j = 0;j<W;++j){
            if(grid[i][j] == 'J'){
                //cout << i << " " << j << " " << cntI[j][i] << " " << cntO[i][j] << "\n";
                ans += cntI[i][j]*cntO[i][j];
            }
        }
    }
    cout << ans << "\n";
    return 0;
}

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