#include <bits/stdc++.h> using namespace std; void dfs(vector <vector<int>>& child,vector<int>& maxpos, int u){ for (int i=0; i<child[u].size(); i++){ dfs(child,maxpos,child[u][i]); maxpos[u]=max(maxpos[u],maxpos[child[u][i]]); } } int solve(int n, int m, const vector<int> &v1, const vector<vector<int>> &v2){ vector <int> maxpos(n); vector <vector<int>> child(n); for (int i=1; i<n; i++){ child[v1[i]].push_back(i); } for (int j=0; j<m; j++){ for (int i=0; i<n-1; i++){ maxpos[v2[j][i]]=max(maxpos[v2[j][i]],i); }} dfs(child,maxpos,0); int ans=0,cur=-1; for (int i=0; i<n-1; i++){ if (cur<i)ans++; for (int j=0; j<m; j++){ cur=max(cur,maxpos[v2[j][i]]); }} return ans; }

/usr/bin/ld: /tmp/ccWGfNbI.o: in function `mtbpdhr2zxjo1o4i9oreohsbuzzl4s6u::taskcase()':
grader.cpp:(.text+0x513): undefined reference to `solve(int, int, std::vector<int, std::allocator<int> >, std::vector<std::vector<int, std::allocator<int> >, std::allocator<std::vector<int, std::allocator<int> > > >)'
collect2: error: ld returned 1 exit status