Submission #1174664

#	Time	Username	Problem	Language	Result	Execution time	Memory
1174664		guagua0407	Balanced Tree (info1cup18_balancedtree)	C++20	23 / 100	4094 ms	4312 KiB

balancedtree

#pragma GCC optimize("O3")
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int,int>
#define f first
#define s second
#define all(x) x.begin(),x.end()
#define _ ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);

int dx[4]={0,0,1,-1};
int dy[4]={1,-1,0,0};

void setIO(string s) {
    freopen((s + ".in").c_str(), "r", stdin);
    freopen((s + ".out").c_str(), "w", stdout);
}

const int inf=1e9;

void solve(){
    int n;
    cin>>n;
    vector<vector<int>> adj(n+1);
    for(int i=0;i<n-1;i++){
        int a,b;
        cin>>a>>b;
        adj[a].push_back(b);
        adj[b].push_back(a);
    }
    vector<int> C(n+1);
    vector<int> tmp;
    for(int i=1;i<=n;i++){
        cin>>C[i];
        if(C[i]==-1) tmp.push_back(i);
    }
    pair<int,vector<int>> mnn;
    vector<int> d(n+1);
    vector<int> c=C;
    mnn.f=inf;
    int sz=(int)tmp.size();
    for(int S=0;S<(1<<sz);S++){
        for(int i=0;i<sz;i++){
            if(S&(1<<i)) c[tmp[i]]=1;
            else c[tmp[i]]=0;
        }
        int D=0;
        int mn=n+1;
        int cc;
        function<void(int,int)> dfs=[&](int v,int p){
            d[v]=d[p]+1;
            if(d[v]!=1 and c[v]==cc){
                mn=min(mn,d[v]-1);
                return;
            }
            for(auto u:adj[v]){
                if(u==p) continue;
                dfs(u,v);
            }
        };
        for(int i=1;i<=n;i++){
            cc=c[i];
            mn=n+1;
            dfs(i,0);
            D=max(D,mn);
        }
        mnn=min(mnn,{D,c});
    }
    if(mnn.f==n+1){
        cout<<-1<<'\n';
    }
    else{
        cout<<mnn.f<<'\n';
        for(int i=1;i<=n;i++){
            cout<<mnn.s[i]<<' ';
        }
        cout<<'\n';
    }
}

int main() {_
    int t;
    cin>>t;
    while(t--){
        solve();
    }
    return 0;
}
//maybe its multiset not set
//yeeorz
//diaoborz

Compilation message (stderr)

balancedtree.cpp: In function 'void setIO(std::string)':
balancedtree.cpp:15:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |     freopen((s + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
balancedtree.cpp:16:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |     freopen((s + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 13 / 13
• Subtask 3: 0 / 26
• Subtask 4: 0 / 45
• Subtask 5: 0 / 6