Submission #1136909

#	Time	Username	Problem	Language	Result	Execution time	Memory
1136909		Matbubble	Triumphal arch (POI13_luk)	C++20	90 / 100	461 ms	21576 KiB

luk

#include <iostream>
#include <iomanip>
#include <string>
#include <math.h>
#include <algorithm>
#include <cstring>
#include <numeric>
#include <vector>
#include <bitset>
#include <map>
#include <set>
#include <queue>
#include <deque>
#include <stack>
#include <unordered_map>
#include <unordered_set>

using namespace std;
#define dbg(x) cerr<<#x<<": "<<x<<"\n";

/*  
MC lover
*/

void solve(){
    long long n; cin>>n;
    long long ans=0;
    vector<vector<long long>>g(n+1);
    for(long long i=1 ; i<n ; i++){
        long long a, b; cin>>a>>b;
        g[a].push_back(b);
        g[b].push_back(a);
    }
    auto dfs=[&](auto &&self, long long u, long long root, long long mid)->long long{
        long long aux=0;
        for(long long v:g[u]){
            if(v==root) continue;
            aux+=self(self, v, u, mid)+1;
        }
        return max(0ll, aux-mid);
    };
    long long l=1, r=1e9;
    while(l<=r){
        long long mid=(l+r)>>1;
        if(dfs(dfs, 1, -1, mid)==0){
            r=mid-1;
            ans=mid;
        }else l=mid+1;
    }
    cout<<ans<<"\n";
}

int main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    solve();
    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 0 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10