Compilare: main.cpp: In function 'void rec(char*, char*, char*, char*, int&)': main.cpp:13:18: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 13 | while(nr != strlen(b)) | ~~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:62:23: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 62 | for(int i =0;i<strlen(a)-1;i++) | ~^~~~~~~~~~~~