Submission #871410

#TimeUsernameProblemLanguageResultExecution timeMemory
871410Cyber_WolfThe Xana coup (BOI21_xanadu)C++17
0 / 100
77 ms13544 KiB
#include <bits/stdc++.h> using namespace std; #define lg long long #define fastio ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0); const lg N = 2e5+5; vector<lg> adj[N]; lg dp[N][2], col[N]; // lg solve(lg src, lg b, lg par) // { // auto&ret = dp[src][b]; // if(~ret) return ret; // ret = 1e18; // for(int i = 0; i < (1ll << adj[src].size()); i++) // { // lg x = (b^(__builtin_popcount(i)&1)); // for(int j = 0; j < adj[src].size(); j++) // { // // } // } // return ret; // } //par true -> must //par false -> must not int main() { lg n; cin >> n; for(int i = 1; i < n; i++) { lg u, v; cin >> u >> v; adj[u].push_back(v); adj[v].push_back(u); } // lg ans = 1e18; // for(int i = 1; i <= n; i++) // { // memset(dp, -1, sizeof(dp)); // ans = min(ans, dfs(i, 0, -1)); // } for(int i = 1; i <= n; i++) { cin >> col[i]; if(!col[i]) { dp[i][0] = dp[i-1][0]; dp[i][1] = dp[i-1][1]+1; } else{ dp[i][0] = dp[i-1][1]+1; dp[i][1] = dp[i-1][0]; } } cout << dp[n][0] << '\n'; }
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