Compilare: main.cpp: In function 'int main()': main.cpp:31:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | if(a<=grid[i].size()) | ~^~~~~~~~~~~~~~~~ main.cpp:34:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | if (x>=grid[i].size()) ind=grid[i].size()-1; | ~^~~~~~~~~~~~~~~~ main.cpp:41:26: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 41 | if(grid[i].size()<=c) | ~~~~~~~~~~~~~~^~~