oj.uz

Submission #633973

# Submission time Handle Problem Language Result Execution time Memory
633973 2022-08-23T14:48:11 Z radal Network (BOI15_net) C++17
0 / 100
 2 ms 2644 KB 
#include <bits/stdc++.h>
#pragma GCC target("sse,sse2")
#pragma GCC optimize("unroll-loops,O3")
#define rep(i,l,r) for (int i = l; i < r; i++)
#define repr(i,r,l) for (int i = r; i >= l; i--)
#define X first
#define Y second
#define all(x) (x).begin() , (x).end()
#define pb push_back
#define endl '\n'
#define debug(x) cerr << #x << " : " << x << endl;
using namespace std;
typedef long long ll;
typedef long double ld;
typedef pair<int,int> pll;
constexpr int N = 1e5+20,mod = 1e9+7,inf = 1e9+10;
inline int mkay(int a,int b){
    if (a+b >= mod) return a+b-mod;
    if (a+b < 0) return a+b+mod;
    return a+b;
}
 
inline int poww(int a,int k){
    if (k < 0) return 0;
    int z = 1;
    while (k){
        if (k&1) z = 1ll*z*a%mod;
        a = 1ll*a*a%mod;
        k /= 2;
    } 
    return z; 
}

vector<int> adj[N];

int main(){
    ios_base :: sync_with_stdio(0); cin.tie(0);
    int n,ans = 0;
    cin >> n;
    rep(i,1,n){
        int u,v;
        cin >> u >> v;
        adj[u].pb(v);
        adj[v].pb(u);
    }
    rep(i,1,n+1) ans += (adj[i].size() == 1);
    cout << (ans+1)/2;
}

Subtask #1
0 / 18.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 2644 KB Unexpected end of file - int32 expected
2 Halted 0 ms 0 KB -

Subtask #2
0 / 45.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 2644 KB Unexpected end of file - int32 expected
2 Halted 0 ms 0 KB -

Subtask #3
0 / 37.0

# Verdict Execution time Memory Grader output
1 Incorrect 2 ms 2644 KB Unexpected end of file - int32 expected
2 Halted 0 ms 0 KB -