Compilare: main.cpp: In function 'void decompress(int, int, int, int)': main.cpp:24:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 24 | if( i >= s.size() ) | ~~^~~~~~~~~~~ main.cpp:32:9: warning: unused variable 'a' [-Wunused-variable] 32 | int a = getNr(); | ^ main.cpp: In function 'int main()': main.cpp:52:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 52 | for( i = 0; i < s.size(); ){ | ~~^~~~~~~~~~ main.cpp:60:7: warning: 'a' may be used uninitialized in this function [-Wmaybe-uninitialized] 60 | if( a == 0 ) a = 1; | ^~