Compilare: main.cpp: In function 'bool inside(int, int)': main.cpp:18:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(x >= 1 && y >= 1 && x < grid.size() && y < grid.size()) ~~^~~~~~~~~~~~~ main.cpp:18:49: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(x >= 1 && y >= 1 && x < grid.size() && y < grid.size()) ~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:53:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < grid.size(); i++){ ~~^~~~~~~~~~~~~