Submission #1026177

#TimeUsernameProblemLanguageResultExecution timeMemory
1026177vaneaRace (IOI11_race)C++14
0 / 100
2 ms13404 KiB
#include <bits/stdc++.h> using namespace std; using ll = long long; const int mxN = 2e5+10; const int mxK = 1e6+10; const int INF = 1e9+10; vector<array<int, 2>> adj[mxN]; int bk = 0, k, ans = INF; int sz[mxN], d[mxK], last[mxK]; bool vis[mxN]; void get_sz(int node, int p) { sz[node] = 1; for(auto [it, w] : adj[node]) { if(it == p || vis[it]) continue; get_sz(it, node); sz[node] += sz[it]; } } int get_c(int node, int p, int n) { for(auto [it, w] : adj[node]) { if(vis[it] || it == p) continue; if(sz[it] * 2 > n) return get_c(it, node, n); } return node; } void get_dist(int node, int p, bool filling, int dist, int s) { if(s > k) return; if(filling) { if(last[s] != bk) { d[s] = dist; last[s] = bk; } else { d[s] = min(d[s], dist); } } else { if(last[k-s] == bk) { ans = min(ans, dist+d[k-s]); } } for(auto [it, w] : adj[node]) { if(it == p || vis[it]) continue; get_dist(it, node, filling, dist+1, s+w); } } void build(int node) { get_sz(node, -1); int c = get_c(node, -1, sz[node]); vis[c] = true; ++bk; d[0] = bk; for(auto [it, w] : adj[c]) { if(vis[it]) continue; get_dist(it, c, 0, 1, w); get_dist(it, c, 1, 1, w); } for(auto [it, w] : adj[c]) { if(vis[it]) continue; build(it); } } int best_path(int n, int K, int h[][2], int l[]) { for(int i = 0; i < n-1; i++) { adj[h[i][0]].push_back({h[i][1], l[i]}); adj[h[i][1]].push_back({h[i][0], l[i]}); } k = K; build(0); return (ans == INF ? -1 : ans); } /* int main() { ios_base::sync_with_stdio(0); cin.tie(0); cout << best_path(11, 12, {{0, 1}, {0, 2}, {2, 3}, {3, 4}, {4, 5}, {0, 6}, {6, 7}, {6, 8}, {8, 9}, {8, 10}}, {3, 4, 5, 4, 6, 3, 2, 5, 6, 7}); }*/

Compilation message (stderr)

race.cpp: In function 'void get_sz(int, int)':
race.cpp:16:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   16 |     for(auto [it, w] : adj[node]) {
      |              ^
race.cpp: In function 'int get_c(int, int, int)':
race.cpp:24:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   24 |     for(auto [it, w] : adj[node]) {
      |              ^
race.cpp: In function 'void get_dist(int, int, bool, int, int)':
race.cpp:47:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   47 |     for(auto [it, w] : adj[node]) {
      |              ^
race.cpp: In function 'void build(int)':
race.cpp:59:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   59 |     for(auto [it, w] : adj[c]) {
      |              ^
race.cpp:64:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   64 |     for(auto [it, w] : adj[c]) {
      |              ^
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