Submission #953444

#	Time	Username	Problem	Language	Result	Execution time	Memory
953444		Darren0724	Cultivation (JOI17_cultivation)	C++17	0 / 100	145 ms	262144 KiB

cultivation

#include <bits/stdc++.h>
using namespace std;
#define LCBorz ios_base::sync_with_stdio(false); cin.tie(0);
#define all(x) x.begin(), x.end()
#define endl '\n'
const int N=200005;
const int INF=1e9;

int32_t main() {
    LCBorz;
    int r,c;cin>>r>>c;
    int n;cin>>n;
    vector dis(r+2,vector(c+2,INF));
    vector<int> a(n),b(n);
    for(int i=0;i<n;i++){
        cin>>a[i]>>b[i];
        dis[a[i]][b[i]]=0;
    }
    vector<int> dx={1,0,-1,0},dy={0,1,0,-1};
    queue<pair<int,int>> q;
    auto check=[&](int a,int b){
        return (a>0&&a<=r&&b>0&&b<r&&dis[a][b]==INF);
    };
    int ans=0;
    for(int k=0;k<4;k++){
        for(int i=1;i<=r;i++){
            for(int j=1;j<=c;j++){
                if(dis[i][j]!=INF){
                    dis[i][j]=0;
                    q.push({i,j});
                }
            }
        }
        int mx=0;
        while(q.size()){
            auto [a,b]=q.front();
            q.pop();
            mx=max(mx,dis[a][b]);
            int c=a+dx[k];
            int d=b+dy[k];
            if(check(c,d)){
                dis[c][d]=dis[a][b]+1;
                q.push({c,d});
            }
        }
        ans+=mx;
    }
    cout<<ans<<endl;
    return 0;
}   

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 30
• Subtask 5: 0 / 20
• Subtask 6: 0 / 20