Submission #1128928

#	Time	Username	Problem	Language	Result	Execution time	Memory
1128928		ByeWorld	Stranded Far From Home (BOI22_island)	C++20	10 / 100	248 ms	25712 KiB

island

#include <bits/stdc++.h>
#pragma GCC optimize("O3")
#define int long long
#define ll long long
#define pb push_back
#define fi first
#define se second
#define lf (id<<1)
#define rg ((id<<1)|1)
#define md ((l+r)>>1)
#define ld long double
using namespace std;
typedef pair<int,int> pii;
typedef pair<char,char> pcc;
typedef pair<int,pii> ipii;
typedef pair<pii,pii> ipiii;
const int MAXN = 3e5+10;
const int MAXA = 1e6;
const int INF = 1e18+10;
const int MOD = 1e9+7;
const int LOG = 32;
const ld EPS = 1e-12;

int n, m, a[MAXN], val[MAXN], par[MAXN];
vector <int> adj[MAXN];
int ans[MAXN];

void dfs(int nw, int pa){
    par[nw] = pa;
    val[nw] = a[nw];
    for(auto nx : adj[nw]){
        if(nx==pa) continue;
        dfs(nx, nw);
        val[nw] += val[nx];
    }
    // cout << nw << ' ' << val[nw] << " nw\n";
}
signed main(){
    // ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin >> n >> m;
    assert(n == m+1);
    for(int i=1; i<=n; i++) cin >> a[i];
    for(int i=1; i<=m; i++){
        int x, y; cin >> x >> y;
        adj[x].pb(y); adj[y].pb(x);
    }
    dfs(1, 0);
    ans[1] = 1;
    for(int i=2; i<=n; i++){
        if(val[i] >= a[par[i]]) ans[i] = ans[par[i]];
    }

    for(int i=1; i<=n; i++)
        cout << ans[i];
    cout << '\n';
}

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