Submission #704248

#	Time	Username	Problem	Language	Result	Execution time	Memory
704248		alanl	Bitaro the Brave (JOI19_ho_t1)	C++14	100 / 100	222 ms	82080 KiB

joi2019_ho_t1

#include <bits/stdc++.h>
#define pb push_back
#define f first
#define s second
#define rep(X, a,b) for(int X=a;X<b;++X)
#define ALL(a) (a).begin(), (a).end()
#define SZ(a) (int)(a).size()
#define NL "\n"
using namespace std;
typedef pair<long long,long long> pll;
typedef pair<int,int> pii;
typedef long long ll;
template<typename A, typename B> ostream& operator<<(ostream &os, const pair<A, B> &p) { return os << '(' << p.first << "," << p.second << ')'; }
template<typename A> ostream& operator<<(ostream &os, const vector<A> &p){
    for(const auto &a:p)
        os << a << " ";
    os << "\n";
    return os;
}

int ocnt[3010][3010], icnt[3010][3010];

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int h, w;
    cin>>h>>w;
    vector<string> grid(h);
    rep(i,0,h){
        cin>>grid[i];
        for(int j=w-1;j>=0;--j) ocnt[i][j]=ocnt[i][j+1]+(grid[i][j]=='O');
    }
    rep(j,0,w){
        for(int i=h-1;i>=0;--i) icnt[i][j]=icnt[i+1][j]+(grid[i][j]=='I');
    }
    ll ans=0;
    rep(i,0,h){
        rep(j,0,w) if(grid[i][j]=='J') ans+=ocnt[i][j+1]*icnt[i+1][j];
        // rep(j,0,w) cout<<icnt[j]<<" ";
        // cout<<NL;
    }
    cout<<ans<<NL;
}

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