Submission #247682

#	Time	Username	Problem	Language	Result	Execution time	Memory
247682		WhaleVomit	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	176 ms	159356 KiB

joi2019_ho_t1

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

#define f first
#define s second
#define pb push_back
#define mp make_pair
#define all(v) v.begin(), v.end()
#define sz(v) (int)v.size()

#define MOO(i, a, b) for(int i=a; i<b; i++)
#define M00(i, a) for(int i=0; i<a; i++)
#define MOOd(i,a,b) for(int i = (b)-1; i >= a; i--)
#define M00d(i,a) for(int i = (a)-1; i>=0; i--)

#define FAST ios::sync_with_stdio(0); cin.tie(0);
#define finish(x) return cout << x << '\n', 0;
#define dbg(x) cerr << ">>> " << #x << " = " << x << "\n";
#define _ << " _ " <<

template<class T> bool ckmin(T& a, const T& b) {return b < a ? a = b, 1 : 0;}
template<class T> bool ckmax(T& a, const T& b) {return a < b ? a = b, 1 : 0;}

typedef long long ll;
typedef long double ld;
typedef vector<int> vi;
typedef pair<int,int> pi;
typedef pair<ld,ld> pd;
typedef complex<ld> cd;

const int MAX_N = 3010;
int n, m;
char arr[MAX_N][MAX_N];
ll icnt[MAX_N][MAX_N];
ll ocnt[MAX_N][MAX_N];

int main() { FAST
    cin >> n >> m;
    M00(i, n) {
        string s; cin >> s;
        M00(j, m) arr[i][j] = s[j];
    }
    M00d(i, n) {
        M00(j, m) {
            if(i == n-1) icnt[i][j] = 0;
            else icnt[i][j] = ((arr[i+1][j] == 'I') + icnt[i+1][j]);
        }
    }
    M00(i, n) {
        M00d(j, m) {
            if(j == m-1) ocnt[i][j] = 0;
            else ocnt[i][j] = ((arr[i][j+1] == 'O') + ocnt[i][j+1]);
        }
    }
    ll res = 0;
    M00(i, n) M00(j, m) {
        if(arr[i][j] == 'J') {
            res += ocnt[i][j] * icnt[i][j];
        }
    }
    finish(res);
}

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