Compilare: main.cpp: In function 'int main()': main.cpp:44:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 44 | for(i=0; i<sol.size()-1; i++) | ~^~~~~~~~~~~~~ main.cpp: In function 'void euler(int)': main.cpp:115:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<varf>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 115 | for(i=0; i<G[start].size(); i++) | ~^~~~~~~~~~~~~~~~ main.cpp: In function 'int grade_pare()': main.cpp:78:12: warning: 'start' may be used uninitialized [-Wmaybe-uninitialized] 78 | return start; | ^~~~~ main.cpp:72:12: note: 'start' was declared here 72 | int i, start; | ^~~~~