Compilare: main.cpp: In function 'void citire()': main.cpp:20:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | while( i < s.size() && isdigit( s[i] )){ | ~~^~~~~~~~~~ main.cpp:29:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | while( i < s.size() ){ | ~~^~~~~~~~~~ main.cpp:36:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 36 | while( i < s.size() && isdigit( s[++i] )) | ~~^~~~~~~~~~ main.cpp: In function 'int solve(int, int)': main.cpp:58:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<cell>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 58 | for( int i = 0 ; i < v[l][c].size() ; i++ ) | ~~^~~~~~~~~~~~~~~~