View Compilation Error

0_0_33897041_3574.cpp: In function 'void work(int)':
0_0_33897041_3574.cpp:82:28: error: no match for 'operator[]' (operand types are 'std::set<std::pair<int, int> >' and 'int')
     REP(i,1,n) fa[i]=i, vis[i]=0, g[i].clear();
                            ^
0_0_33897041_3574.cpp:88:12: error: no match for 'operator[]' (operand types are 'std::set<std::pair<int, int> >' and 'int')
         vis[i] = 1;
            ^
0_0_33897041_3574.cpp:93:24: error: no match for 'operator[]' (operand types are 'std::set<std::pair<int, int> >' and 'int')
     REP(i,1,m) if (!vis[i]) {
                        ^