Compilare: main.cpp: In function 'void dfs(std::vector<std::vector<int> >&, int, int, int, int)': main.cpp:20:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | if (x < v.size() and x >= 0 and y < v[0].size() and y >= 0) { | ~~^~~~~~~~~~ main.cpp:20:39: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | if (x < v.size() and x >= 0 and y < v[0].size() and y >= 0) { | ~~^~~~~~~~~~~~~