Submission #1305591

#	Time	Username	Problem	Language	Result	Execution time	Memory
1305591		thesentro	Stranded Far From Home (BOI22_island)	C++20	10 / 100	253 ms	32168 KiB

island

/*
 _____ _          ____             _             
|_   _| |__   ___/ ___|  ___ _ __ | |_ _ __ ___  
  | | | '_ \ / _ \___ \ / _ \ '_ \| __| '__/ _ \ 
  | | | | | |  __/___) |  __/ | | | |_| | | (_) |
  |_| |_| |_|\___|____/ \___|_| |_|\__|_|  \___/ 
*/
 
#include <bits/stdc++.h>
#pragma GCC optimize("O3")
using namespace std;
#define ll long long
ll mod = 1e9+7;
//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
ll binpow(ll a, ll b)
{
    ll res = 1;
    while (b>0)
    {
        if (b&1)
            res = (res*a)%mod;
        a = (a*a)%mod;
        b>>=1;
    }
    return res;
}
ll gcd(ll x, ll y)
{
    if (y==0)
        return x;
    return gcd(y, x%y);
}
ll maxi = 202020;
vector<vector<ll>>g(maxi);
vector<ll>sum(maxi, 0);
vector<ll>vis(maxi, 0);
vector<ll>v(maxi);
void dfs(ll x)
{
    vis[x] = 1;
    for (auto i:g[x])
    {
        if (vis[i]) continue;
        dfs(i);
        sum[x] += sum[i];
    }
    sum[x] += v[x];
}
string res(maxi, '0');
void dfs1(ll x, ll req)
{
    vis[x] =1;
    ll var = sum[x];
    if (var>=req)
        res[x-1] = '1';
    else
        return;
    for (auto i:g[x])
    {
        if(vis[i]==0)
        {
            dfs1(i, v[x]);
        }
    }
}
void solve()
{   
    ll n,m;
    cin>>n>>m;
    for (int i=1 ; i<=n ;i++) cin>>v[i];
    for (int i=1 ; i<=m ;i++)
    {
        ll x,y;
        cin>>x>>y;
        g[x].push_back(y);
        g[y].push_back(x);
    }
    dfs(1);
    for (int i=1  ; i<=n ;i++) vis[i] = 0;
    dfs1(1, 0);
    // cout<<sum[1]<<" "<<sum[2]<<endl;
    for (int i=0 ; i<n ;i++)
        cout<<res[i];
}
int main()
{
    ll tt = 1;
    // cin>>tt;
    while (tt--)
    {
        solve();
    }
    return 0;
}

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