Submission #869486

#TimeUsernameProblemLanguageResultExecution timeMemory
869486CookieMuseum (CEOI17_museum)C++14
100 / 100
349 ms784740 KiB
#include<bits/stdc++.h> #include<fstream> using namespace std; ifstream fin("HCN.INP"); ofstream fout("HCN.OUT"); #define sz(a) (int)a.size() #define ll long long #define pb push_back #define forr(i, a, b) for(int i = a; i < b; i++) #define dorr(i, a, b) for(int i = a; i >= b; i--) #define ld long double #define vt vector #include<fstream> #define fi first #define se second #define pll pair<ll, ll> #define pii pair<int, int> const ld PI = 3.14159265359; //using u128 = __uint128_t; //const int x[4] = {1, -1, 0, 0}; //const int y[4] = {0, 0, 1, -1}; const ll mod = 1e9 + 7; const int mxn = 1e6 + 5, mxq = 2e5 + 5, sq = 350, mxv = 2e6 + 5; const ll inf = 1e9; int n, k, root; int dp[10001][10001], sz[10001], dp2[10001][10001]; vt<pii>adj[10001]; void ckmin(int &a, int b){ a = min(a, b); } void dfs(int s, int pre, int dep){ dp[s][1] = 0; dp2[s][1] = -dep; sz[s] = 1; for(auto [i, w]: adj[s]){ if(i != pre){ dfs(i, s, dep + w); for(int j = sz[s] + sz[i]; j >= 1; j--){ for(int take = max(1, j - sz[s]); take <= min(j, sz[i]); take++){ ckmin(dp[s][j], dp[s][j - take] + dp[i][take] + 2 * w); ckmin(dp2[s][j], dp2[s][j - take] + dp[i][take] + 2 * w); ckmin(dp2[s][j], dp[s][j - take] + dp2[i][take] + 2 * w); } } sz[s] += sz[i]; } } } signed main(){ ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); cin >> n >> k >> root; for(int i = 1; i <= n; i++){ for(int j = 0; j <= k; j++){ dp[i][j] = dp2[i][j] = inf; } } for(int i = 1; i < n; i++){ int u, v, w; cin >> u >> v >> w; adj[u].pb({v, w}); adj[v].pb({u, w}); } dfs(root, -1, 0); cout << dp2[root][k]; return(0); }

Compilation message (stderr)

museum.cpp: In function 'void dfs(int, int, int)':
museum.cpp:34:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   34 |     for(auto [i, w]: adj[s]){
      |              ^
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