Submission #595235

#	Time	Username	Problem	Language	Result	Execution time	Memory
595235		shrimb	Bitaro the Brave (JOI19_ho_t1)	C++17	100 / 100	241 ms	158796 KiB

joi2019_ho_t1

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

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;

template<class x>
using ordered_set = tree<x, null_type,less<x>, rb_tree_tag,tree_order_statistics_node_update>;

#define int long long
#define endl '\n'
#define mod 1000000007
//\
#define mod 1686876991

const int maxn = 3001;

char g[maxn][maxn];
int suffO[maxn][maxn], suffI[maxn][maxn];
signed main () {
    cin.tie(0)->sync_with_stdio(0);

    int n, m;

    cin >> n >> m;


    for (int i = 0 ; i < n ; i++) {
        for (int j = 0 ; j < m ; j++) cin >> g[i][j];
    }

    int ans = 0;

    for (int i = n - 1 ; i >= 0 ; i--) {
        for (int j = m - 1 ; j >= 0 ; j--) {
            if (i + 1 < n) suffO[i][j] = suffO[i + 1][j];
            suffO[i][j] += g[i][j] == 'I';
            if (j + 1 < m) suffI[i][j] = suffI[i][j + 1];
            suffI[i][j] += g[i][j] == 'O';
            if (g[i][j] == 'J') {
                ans += suffO[i][j] * suffI[i][j];
            }
        }
    }

    cout << ans << endl;
}

Compilation message (stderr)

joi2019_ho_t1.cpp:14:1: warning: multi-line comment [-Wcomment]
   14 | //\
      | ^

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