Borderou de evaluare (job #670638)

Compilare: main.cpp: In function 'int read()': main.cpp:22:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'unsigned int'} [-Wsign-compare] 22 | while( i < s.size() && isdigit( s[i] ) ) { | ~~^~~~~~~~~~ main.cpp:26:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'unsigned int'} [-Wsign-compare] 26 | while( i < s.size() && !isalnum( s[i] ) ) | ~~^~~~~~~~~~ main.cpp:29:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'unsigned int'} [-Wsign-compare] 29 | while( i < s.size() && isalpha( s[i] ) ) | ~~^~~~~~~~~~ main.cpp:31:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'unsigned int'} [-Wsign-compare] 31 | while( i < s.size() && !isalnum( s[i] ) ) | ~~^~~~~~~~~~ main.cpp:34:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'unsigned int'} [-Wsign-compare] 34 | while( i < s.size() && isdigit( s[i] ) ) { | ~~^~~~~~~~~~ main.cpp:40:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'unsigned int'} [-Wsign-compare] 40 | while( i < s.size() && isdigit( s[i] ) ) { | ~~^~~~~~~~~~