Submission #1236381

#	Time	Username	Problem	Language	Result	Execution time	Memory
1236381		Geforgs	Dango Maker (JOI18_dango_maker)	C++20	0 / 100	0 ms	328 KiB

dango_maker

#include <iostream>
#include <iomanip>
#include <vector>
#include <cmath>
#include <algorithm>
#include <set>
#include <queue>
#include <map>
#include <unordered_map>
#include <stack>
#include <bitset>
#include <string>
#include <cstring>
#include <iterator>
#include <random>
#define ll long long
#define ld long double
#define inf (ll)(2*1e18)
#define sort(a) sort(a.begin(), a.end())
#define reverse(a) reverse(a.begin(), a.end())
#define pb push_back
#define endl "\n"
using namespace std;

bool DFS(ll id, vector<vector<ll>>& b, vector<ll>& go, vector<bool>& visited){
    if(visited[id]) return false;
    visited[id] = true;
    for(auto el: b[id]){
        if(go[el] == -1){
            go[el] = id;
            return true;
        }
        if(DFS(go[el], b, go, visited)){
            go[el] = id;
            return true;
        }
    }
    return false;
}

void solve(){
    ll n, m, i, j, res=0;
    cin>>n>>m;
    vector<vector<char>> a(n, vector<char>(m));
    vector<vector<ll>> b(n*m);
    vector<ll> go(n*m, -1);
    for(i=0;i<n;++i){
        for(j=0;j<m;++j){
            cin>>a[i][j];
        }
    }
    for(i=0;i<n-2;++i){
        for(j=0;j<m;++j){
            if(a[i][j] == 'R' and a[i+1][j] == 'G' and a[i+2][j] == 'W'){
                b[i*m + j].pb((i+1)*m + j);
                b[(i+1)*m + j].pb(i*m + j);
            }
        }
    }
    for(i=0;i<n;++i){
        for(j=0;j<m-2;++j){
            if(a[i][j] == 'R' and a[i][j+1] == 'G' and a[i][j+2] == 'W'){
                b[i*m + j].pb(i*m + j + 1);
                b[i*m + j + 1].pb(i*m + j);
            }
        }
    }
    for(i=0;i<n*m;++i){
        if(a[i/m][i%m] == 'R'){
            vector<bool> visited(n*m, false);
            DFS(i, b, go, visited);
        }
    }
    for(i=0;i<n*m;++i){
        if(go[i] != -1) ++res;
    }
    cout<<res<<endl;
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    srand(time(nullptr));
    ll t=1;
//    cin>>t;
    for(;t>0;--t){
        solve();
    }
    return 0;
}

• Subtask 1: 0 / 13
• Subtask 2: 0 / 20
• Subtask 3: 0 / 67