Submission #41124

#TimeUsernameProblemLanguageResultExecution timeMemory
41124wzyBiochips (IZhO12_biochips)C++11
0 / 100
284 ms400376 KiB
#include <bits/stdc++.h> using namespace std; #define eps (int) 1e9 #pragma GCC optimize("Ofast") #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native") #define pb push_back int root , rv[200005], t = -1 , maxrv = 0 , dp[200005][505] , c[200005] , n , m , st[200005] , ed[200005]; vector<int> adj[200005]; bool vis[200005][505]; void dfs(int x , int y){ st[x] = ++t; rv[st[x]] = x; maxrv = max(maxrv , st[x]); for(int i = 0 ; i < adj[x].size() ; i++){ int v = adj[x][i]; if(v == y) continue; dfs(v,x); } ed[x] = t; return; } int solve(int i , int j){ if(i == n-1 && j == m - 1){ return dp[i][j] = c[i]; } else if(i >= n-1) return -eps; if(vis[i][j]) return dp[i][j]; vis[i][j] = true; return dp[i][j] = max(solve(i +1 , j), solve(ed[rv[i]] + 1 , j + 1) + c[rv[i]]); } int32_t main(){ scanf("%d%d" , &n , &m); memset(dp, -1 , sizeof dp); for(int i = 0 ; i <n; i++){ int x , y; scanf("%d%d" , &x, &y); c[i] = y; if(x == 0){ root = i; continue; } else{ adj[i].pb(x-1); adj[x-1].pb(i); } } dfs(root, root); int qq = solve(0 , 0); printf("%d\n" , qq); }

Compilation message (stderr)

biochips.cpp: In function 'void dfs(int, int)':
biochips.cpp:14:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i = 0 ; i < adj[x].size() ; i++){
                    ^
biochips.cpp: In function 'int32_t main()':
biochips.cpp:34:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d" , &n , &m);
                         ^
biochips.cpp:38:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d" , &x, &y);
                         ^
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