Compilare: main.cpp: In function 'void dfs(int, int)': main.cpp:31:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | for (i = 0; i<v[x].size(); i++) | ~^~~~~~~~~~~~ main.cpp: In function 'void dfsprop(int, int, int)': main.cpp:47:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 47 | for (i = 0; i<v[x].size(); i++) | ~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:148:13: warning: division by zero [-Wdiv-by-zero] 148 | fout << 1/0; | ~^~