Submission #1274656

#	Time	Username	Problem	Language	Result	Execution time	Memory
1274656		hiepsimauhong	Bitaro the Brave (JOI19_ho_t1)	C++20	100 / 100	227 ms	150656 KiB

joi2019_ho_t1

#include <bits/stdc++.h>

using namespace std;

#define int long long
using ll = long long;

#define FOR(I, L, R) for(int I(L) ; I <= (int)R ; ++I)
#define FOD(I, R, L) for(int I(R) ; I >= (int)L ; --I)
#define FOA(I, A) for(auto &I : A)

#define print(A,L,R) FOR(OK, L, R){if(A[OK]<=-oo / 10||A[OK]>=oo)cout<<"- ";else cout<<A[OK]<<' ';}cout<<'\n';
#define prints(A) FOA(OK, A){cout<<OK<<' ';}cout << '\n';
#define printz(A,L,R) FOR(OK, 0, L){FOR(KO, 0, R){if(A[OK][KO]>-oo&&A[OK][KO]<oo)cout<<A[OK][KO]<<' ';else cout << "- ";} cout << '\n';}cout << '\n';

#define fs first
#define sd second
#define ii pair<int,int>
#define iii pair<int, ii>
#define all(A) A.begin(), A.end()
#define quickly ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

const int N = 3000 + 5;
const int mod = 1e9 + 7;
const int oo = 1e18;

int n, m;
string a[N];
int orb[N][N], ing[N][N];

signed main(){ quickly
        cin >> n >> m;

        FOR(i, 1, n){
                cin >> a[i];
                a[i] = " " + a[i];
        }

        FOR(i, 1, n){
                FOD(j, m, 1){
                        orb[i][j] = orb[i][j + 1] + (a[i][j] == 'O');
                }
        }

        FOR(j, 1, m){
                FOD(i, n, 1){
                        ing[i][j] = ing[i + 1][j] + (a[i][j] == 'I');
                }
        }

        int ans = 0;
        FOR(i, 1, n){
                FOR(j, 1, m){
                        if(a[i][j] == 'J'){
                                ans += orb[i][j + 1] * ing[i + 1][j];
                        }
                }
        }

        cout << ans;
}

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