mars.cpp: In function 'int dfs(int, int, int)':
mars.cpp:14:1: warning: no return statement in function returning non-void [-Wreturn-type]
14 | }
| ^
mars.cpp: In function 'std::string process(std::vector<std::vector<std::__cxx11::basic_string<char> > >, int, int, int, int)':
mars.cpp:56:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
56 | for(int i = 0; i < grid.size(); i ++){
| ~~^~~~~~~~~~~~~
mars.cpp:57:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
57 | for(int j = 0; j < grid[i].size(); j ++){
| ~~^~~~~~~~~~~~~~~~
mars.cpp:63:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
63 | for(int i = 0; i < v.size(); i ++){
| ~~^~~~~~~~~~
mars.cpp:64:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
64 | for(int j = 0; j < v[i].size(); j ++){
| ~~^~~~~~~~~~~~~