Submission #1121530

#	Time	Username	Problem	Language	Result	Execution time	Memory
1121530		vjudge1	Stranded Far From Home (BOI22_island)	C++17	0 / 100	1084 ms	524288 KiB

island

#include <bits/stdc++.h>

#define ll long long
#define all(x) x.begin(), x.end()
#define in insert
#define F first
#define S second
#define ppf pop_front
#define pb push_back
#define ppb pop_back
#define pf push_front
#define pii pair <int, int>
#define pll pair <ll, ll>
#define boost() ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define sz(x) (int)x.size()

using namespace std;

const int N = 2e5+123;
const ll mod = 1e9+7;

vector<int> g[N];
int a[N];
vector<int> ans(N , 0);
int ls[N];
void dfs(int v,int p){
    ls[v]=a[v];
    for(int to : g[v]){
        if(to != p){
            dfs(to , v);
            ls[v]+=ls[to];
        }
    }
}
void dfs2(int v , int p){
    if(ans[p] == 0)
        ans[v]=0;
    else{
        if(ls[v] >= a[p])
            ans[v]=1;
    }
    for(int to : g[v]){
        if(to != p){
            dfs2(to , v);
        }
    }
}

void solve() {
    int n,m;
    cin >> n >> m;
    
    for(int i=1 ; i <= n ; i++){
        cin >> a[i];
    }
    
    for(int i=1 ; i <= m ; i++){
        int v,u;
        cin >> v >> u;
        g[u].pb(v);
        g[v].pb(u);
    }
    
    ans[0]=1;
    dfs(1 , 0);
    dfs2(1 , 0);
    for(int i=1 ; i <= n ; i++){
        cout << ans[i];
    }
    
}
/*
4 3 
4 3 1 1 
1 2 
2 3 
3 4 
*/
signed main() {
    boost();
    int tt=1;
    //cin >> tt;
    while (tt--) {
        solve();
    }
    return 0;
}

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