Compilare: user.cpp: In function ‘int main()’: user.cpp:76:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < trasee.size()-1; ++i){ ^ user.cpp: In lambda function: user.cpp:64:19: warning: control reaches end of non-void function [-Wreturn-type] return i; } } }; ^