oj.uz

Submission #766686

# Submission time Handle Problem Language Result Execution time Memory
766686 2023-06-26T04:26:20 Z Pichon5 Papričice (COCI20_papricice) C++17
50 / 110
 1000 ms 21660 KB 
#include <iostream>
#include <vector>
#include <set>
#include <map>
#include <algorithm>
#include <string>
#include <sstream>
#include <fstream>
#include <cmath>
#include <queue>
#include <stack>
#include <unordered_map>
#include <unordered_set>
#include <bitset>
#define fast ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define ll long long int
#define vi vector<int>
#define vll vector<ll>
#define pb push_back
#define F first
#define S second
#define mp make_pair
using namespace std;
#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")
#pragma GCC target("popcnt")
const int tam=200005;
vi G[tam];
int sz[tam];
multiset<int> todos;
int res=1e9;
void init(int nodo, int ant){
    sz[nodo]=1;
    for(auto x:G[nodo]){
        if(x!=ant){
            init(x,nodo);
            sz[nodo]+=sz[x];
        }
    }
}
int n;
void dfs(int nodo, int ant){
    for(auto it : G[nodo]){
        if(it==ant)continue;
        int tami=sz[it];
        int falta=n-tami;
        auto it2=todos.lower_bound((n-sz[it])/2);
        if(it2!=todos.end()){
            int val=(*it2);
            int ahora=max({val,falta-val,tami})-min({val,falta-val,tami});
            res=min(res,ahora);
        }
        if(it2!=todos.begin()){
            it2--;
            int val=(*it2);
            int ahora=max({val,falta-val,tami})-min({val,falta-val,tami});
            res=min(res,ahora);
        }

        dfs(it,nodo);
    }
    
    if(ant!=-1){
        todos.insert(sz[nodo]);
    }
}
int main(){
    fast
    int a,b;
    cin>>n;
    for(int i=1;i<n;i++){
        cin>>a>>b;
        G[a].pb(b);
        G[b].pb(a);
    }
    for(int i=1;i<=10;i++){
        todos.clear();
        int cual=rand()%n+1;
        init(cual,-1);
        dfs(cual,-1);
    }
    cout<<res<<"\n";

    return 0;
}

Compilation message

papricice.cpp:25: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
   25 | #pragma GCC optimization ("O3")
      | 
papricice.cpp:26: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
   26 | #pragma GCC optimization ("unroll-loops")
      |

Subtask #1
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 3 ms 4952 KB Output is correct
4 Correct 2 ms 4948 KB Output is correct
5 Correct 2 ms 4948 KB Output is correct

Subtask #2
35.0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 3 ms 4952 KB Output is correct
4 Correct 2 ms 4948 KB Output is correct
5 Correct 2 ms 4948 KB Output is correct
6 Correct 5 ms 5076 KB Output is correct
7 Correct 5 ms 5076 KB Output is correct
8 Correct 5 ms 5172 KB Output is correct
9 Correct 5 ms 5076 KB Output is correct
10 Correct 5 ms 5076 KB Output is correct

Subtask #3
0 / 60.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Correct 3 ms 4952 KB Output is correct
4 Correct 2 ms 4948 KB Output is correct
5 Correct 2 ms 4948 KB Output is correct
6 Correct 5 ms 5076 KB Output is correct
7 Correct 5 ms 5076 KB Output is correct
8 Correct 5 ms 5172 KB Output is correct
9 Correct 5 ms 5076 KB Output is correct
10 Correct 5 ms 5076 KB Output is correct
11 Execution timed out 1052 ms 21660 KB Time limit exceeded
12 Halted 0 ms 0 KB -