Compilare: main.cpp: In function 'int main()': main.cpp:49:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 49 | for(int j = 0; j < a[i].size(); ++j){ | ~~^~~~~~~~~~~~~ main.cpp:75:40: warning: 'y' may be used uninitialized [-Wmaybe-uninitialized] 75 | g << res - 1 << " " << x << " " << y; | ^ main.cpp:65:23: note: 'y' was declared here 65 | int res = 1e9, x, y; | ^ main.cpp:75:33: warning: 'x' may be used uninitialized [-Wmaybe-uninitialized] 75 | g << res - 1 << " " << x << " " << y; | ^~~ main.cpp:65:20: note: 'x' was declared here 65 | int res = 1e9, x, y; | ^