Compilare: main.cpp: In function 'int rcheck(char*)': main.cpp:21:16: warning: comparison of integer expressions of different signedness: 'int' and 'size_t' {aka 'long unsigned int'} [-Wsign-compare] 21 | for (i = 0; i < strlen(s); ++i) | ~~^~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:41:9: warning: 'nrt' may be used uninitialized in this function [-Wmaybe-uninitialized] 41 | long nrt; | ^~~