Submission #1037343

#	Time	Username	Problem	Language	Result	Execution time	Memory
1037343		phong	Power Plant (JOI20_power)	C++17	0 / 100	1 ms	5980 KiB

power

//#pragma GCC optimize("Ofast")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,fma")
//#pragma GCC optimize("unroll-loops")
#include<bits/stdc++.h>

#define ll long long
#define int long long
const int nmax = 2e5 + 5, N = 1e5;
const ll oo = 1e18;
const int lg = 19, M = 2, mod = 1e6;
#define pii pair<ll, ll>
#define fi first
#define se second
#define debug(a, n) for(int i = 1; i <= n; ++i) cout << a[i] << ' '; cout << "\n";
#define endl "\n"
#define task "code"
using namespace std;

int n;
vector<int> adj[nmax];
int f[nmax], c[nmax];

void dfs(int u, int p){
    bool ok = 1;
    for(auto v : adj[u]){
        if(v == p) continue;
        dfs(v, u);
        f[u] += f[v];
    }
    if(!f[u]) f[u] += c[u];
}

//void dfs_2(int u, int p){
//    for(int i = 1; i <= m; ++i){
//        int v = adj[u][i];
//        pre[]
//        if(v == p) continue;
//    }
//}
main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);
//    freopen(task".inp", "r", stdin);
//    freopen(task".out", "w", stdout);
    cin >> n;
    for(int i = 1; i < n; ++i){
        int u, v;
        cin >> u >> v;
        adj[u].push_back(v);
        adj[v].push_back(u);
    }
    for(int i =1 ; i <= n; ++i){
        char x;
        cin >> x;
        c[i] = (x == '1');
    }
    dfs(1, -1);
    int ans =0;
    for(int i = 1; i <= n; ++i) ans = max(ans, f[i] +c[i] - (f[i] == 1));
    cout << ans;

}
/*

2 3
0 0 1
0 0 0
3
2 2
2 1
1 2
sort theo x + y
*/

Compilation message (stderr)

power.cpp: In function 'void dfs(long long int, long long int)':
power.cpp:24:10: warning: unused variable 'ok' [-Wunused-variable]
   24 |     bool ok = 1;
      |          ^~
power.cpp: At global scope:
power.cpp:40:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   40 | main(){
      | ^~~~

• Subtask 1: 0 / 6
• Subtask 2: 0 / 41
• Subtask 3: 0 / 53