Compilare: user.cpp: In function ‘void solve(std::vector<point>, std::vector<point>)’: user.cpp:46:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < a.size() ; i++){ ^ user.cpp:47:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < b.size(); j++){ ^ user.cpp: In function ‘int main()’: user.cpp:72:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Asol.size(); i++){ ^ user.cpp: In function ‘void solve(std::vector<point>, std::vector<point>)’: user.cpp:44:14: warning: ‘na’ may be used uninitialized in this function [-Wmaybe-uninitialized] int ans, na, nb, dif, i; ^ user.cpp:44:18: warning: ‘nb’ may be used uninitialized in this function [-Wmaybe-uninitialized] int ans, na, nb, dif, i; ^