Compilare: main.cpp: In function 'int main()': main.cpp:39:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | for (int i = 0; i<sol.size(); i++) { | ~^~~~~~~~~~~ main.cpp: In function 'void Euler(int)': main.cpp:76:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<varf>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 76 | for (int i = 0; i<G[start].size(); i++) { | ~^~~~~~~~~~~~~~~~ main.cpp: In function 'int grade_pare()': main.cpp:67:9: warning: 'start' may be used uninitialized [-Wmaybe-uninitialized] 67 | {int i, start; | ^~~~~