Compilare: user.cpp: In function ‘void dfs(int, int&, std::vector<std::pair<int, int> >*)’: user.cpp:32:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[nod].size(); i++) { ~~^~~~~~~~~~~~~~~ user.cpp: In function ‘void bfs(int, std::vector<std::pair<int, int> >*)’: user.cpp:59:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g[top].size(); i++) { ~~^~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:90:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < g[i].size(); j++) { ~~^~~~~~~~~~~~~ user.cpp:96:38: warning: suggest parentheses around assignment used as truth value [-Wparentheses] mn[i] = lvl[i] = viz[i] = ctc[i] = 0; ~~~~~~~^~~ user.cpp:105:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < gr[i].size(); j++) { ~~^~~~~~~~~~~~~~