Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:31:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < lo[it].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:36:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < hi[it].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:41:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < lo[it].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:42:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i < lo[node].size()) ~~^~~~~~~~~~~~~~~~~ main.cpp:48:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0 ; i < hi[it].size() ; i++){ ~~^~~~~~~~~~~~~~~ main.cpp:49:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i < hi[node].size()) ~~^~~~~~~~~~~~~~~~~ main.cpp:15:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(auto it: v[node]) ^~~ main.cpp:56:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' itnow = upper_bound(lo[node].begin(), lo[node].end(), val[node]) - lo[node].begin() - 1; ^~~~~ main.cpp:58:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(itnow == lo[node].size() - 1) ~~~~~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:65:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(itnow == hi[node].size() - 1) ~~~~~~^~~~~~~~~~~~~~~~~~~~~~