Submission #668980

#	Time	Username	Problem	Language	Result	Execution time	Memory
668980		Dan4Life	Beads and wires (APIO14_beads)	C++17	0 / 100	1 ms	576 KiB

beads

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define pb push_back
#define all(a) a.begin(),a.end()
#define mp make_pair
#define fi first
#define se second
 
const int maxn = (int)1e4+10;
int n, num=0;
int a[maxn], b[maxn], c[maxn], deg[maxn];
vector<int> adj[maxn];
bool vis[maxn];

void dfs(int s){
    vis[s]=1; num++;
    for(auto u : adj[s])
        if(!vis[u]) dfs(u);
}

int32_t main()
{
    ios_base::sync_with_stdio(false); cin.tie(0);
    cin >> n; int ans = 0;
    for(int i = 0; i < n-1; i++) cin >> a[i] >> b[i] >> c[i];
    for(int mask = 0; mask < (1<<(n-1)); mask++){
        int sum = 0, ok=1;
        for(int i = 1; i <= n; i++) adj[i].clear(), vis[i]=false, deg[i]=0;
        for(int i = 0; i < n-1; i++) sum+=!!(mask&(1<<i))*c[i];
        for(int i = 0; i < n-1; i++) 
            if(mask&(1<<i)) deg[a[i]]++, deg[b[i]]++, adj[a[i]].pb(b[i]);
        for(int i = 1; i <= n; i++){
            if(deg[i]>3) ok=0; num=0;
            if(!vis[i]) dfs(i), ok&=(num%2==1);
        }
        if(ok) ans = max(ans, sum);
    }
    cout << ans;
}

Compilation message (stderr)

beads.cpp: In function 'int32_t main()':
beads.cpp:34:13: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
   34 |             if(deg[i]>3) ok=0; num=0;
      |             ^~
beads.cpp:34:32: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'if'
   34 |             if(deg[i]>3) ok=0; num=0;
      |                                ^~~

• Subtask 1: 0 / 13
• Subtask 2: 0 / 15
• Subtask 3: 0 / 29
• Subtask 4: 0 / 43