Submission #1121410

#TimeUsernameProblemLanguageResultExecution timeMemory
1121410namprozzRace (IOI11_race)C++17
Compilation error
0 ms0 KiB
#include <bits/stdc++.h> #define ll long long using namespace std; const int MAXN = 200005; int n; ll k; vector<pair<int, ll>> adj[MAXN]; int child[MAXN]; bool marked[MAXN]; void countChild(int u, int p) { child[u] = 1; for(auto [v, w] : adj[u]) { if(v == p or marked[v]) continue; countChild(v, u); child[u] += child[v]; } } int findCentroid(int u, int p, int n) { for(auto [v, w] : adj[u]) { if(v == p or marked[v]) continue; if(child[v] > n / 2) { return findCentroid(v, u, n); } } return u; } unordered_map<ll, ll> dp; void dfs(int u, int p, ll tong) { if(tong > k) return; dp[tong]++; for(auto [v, w] : adj[u]) { if(v == p or marked[v]) continue; dfs(v, u, tong + w); } } ll res = 0; void decomp(int u) { countChild(u, -1); int c = findCentroid(u, -1, child[u]); marked[c] = true; dp.clear(); dfs(c, -1, 0); for(auto [tong, dem] : dp) { if(dp.count(k - tong)) { res += dem * dp[k - tong]; } } for(auto [v, w] : adj[c]) { if(marked[v]) continue; decomp(v); } } int main() { ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0); cin >> n >> k; for(int i = 0; i < n - 1; i++) { int u, v; ll w; cin >> u >> v >> w; adj[u].push_back({v, w}); adj[v].push_back({u, w}); } fill(marked, marked + n, false); decomp(0); if(res == 0) { cout << -1 << '\n'; } else { cout << res << '\n'; } }

Compilation message (stderr)

/usr/bin/ld: /tmp/ccVWjIPk.o: in function `main':
race.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccifN4Yg.o:grader.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/ccifN4Yg.o: in function `main':
grader.cpp:(.text.startup+0x28): undefined reference to `best_path(int, int, int (*) [2], int*)'
collect2: error: ld returned 1 exit status