Compilare: main.cpp: In function 'int main()': main.cpp:46:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 46 | for(int j = 0; j < a[i].size(); ++j){ | ~~^~~~~~~~~~~~~ main.cpp:72:36: warning: 'y' may be used uninitialized [-Wmaybe-uninitialized] 72 | g << res << " " << x << " " << y; | ^ main.cpp:62:23: note: 'y' was declared here 62 | int res = 1e9, x, y; | ^ main.cpp:72:29: warning: 'x' may be used uninitialized [-Wmaybe-uninitialized] 72 | g << res << " " << x << " " << y; | ^~~ main.cpp:62:20: note: 'x' was declared here 62 | int res = 1e9, x, y; | ^