Submission #987295

#	Time	Username	Problem	Language	Result	Execution time	Memory
987295		batsukh2006	Stranded Far From Home (BOI22_island)	C++17	10 / 100	173 ms	5200 KiB

island

#include<iostream>
#include<stdio.h>
#include<math.h>
#include<map>
#include<string>
#include<algorithm>
#include<vector>
#include<string.h>
#include<utility>
#include<set>
#include<cmath>
#include<queue>
#include<deque>
#include<functional>
#include<stack>
#include<limits.h>
#include<iomanip>
#include<unordered_map> 
#include<numeric>
#include<tuple>
#include<bitset>
using namespace std;
 
#define MOD 1000000007
#define int long long
#define ss second
#define ff first
#define endl '\n'
typedef pair<int,int> pp;
void solve(){
	int n,m; cin>>n>>m;
    if(n<=2000&&m<=2000){
        vector<int> v[n+1],s(n+1);
        for(int i=1; i<=n; i++) cin>>s[i];
        for(int i=1; i<=m; i++){
            int a,b; cin>>a>>b;
            v[a].push_back(b);
            v[b].push_back(a);
        }
        int need=0;
        vector<int> dp(n+1);
        for(int i=1; i<=n; i++){
            priority_queue<pp,vector<pp>,greater<pp> > q;
            vector<bool> vis(n+1);
            q.push({s[i],i});
            need+=s[i];
            vis[i]=1;
            while(!q.empty()){
                int w=q.top().ff;
                int a=q.top().ss;
                if(w>dp[i]&&a!=i) break;
                dp[i]+=w;
                q.pop();
                for(auto node: v[a]){
                    if(!vis[node]){
                        vis[node]=1;
                        q.push({s[node],node});
                    }
                }
            }
        }
        for(int i=1; i<=n; i++){
            if(dp[i]==need) cout<<1;
            else cout<<0;
        }
    }else{
        vector<int> dp(n+1),s(n+1),p(n+1);
        for(int i=1; i<=n; i++){
            cin>>s[i];
            dp[i]=s[i];
        }
        for(int i=1; i<=m; i++){
            int a,b; cin>>a>>b;
            if(a>b) swap(a,b);
            dp[a]+=s[b];
            p[b]=a;
        }
        for(int i=2; i<=n; i++){
            if(dp[i]==dp[p[i]]) dp[p[i]]+=dp[i]-s[i];
            if(dp[i]>=dp[p[i]]) dp[i]+=dp[p[i]];
            else dp[p[i]]+=dp[i]-s[i];
        }
        for(int i=1; i<=n; i++){
            if(dp[i]>=s[1]) cout<<1;
            else cout<<0;
        }
    }
}
signed main(){
    // freopen("file.in", "r", stdin);
    // freopen("file.out", "w", stdout);
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    
    int t=1;
    // cin>>t;
    while(t--){
        solve();
        cout<<endl;
    }
    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 15
• Subtask 4: 0 / 30
• Subtask 5: 0 / 35