Compilare: main.cpp: In function 'void verifica()': main.cpp:23:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < strlen(s); i ++) ~~^~~~~~~~~~~ main.cpp:26:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(st >= 0 && dr <= strlen(s)-1) ~~~^~~~~~~~~~~~~~ main.cpp:30:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(st < 0 || dr > strlen(s)-1) ~~~^~~~~~~~~~~~~ main.cpp:39:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(st >= 0 && dr <= strlen(s)-1) ~~~^~~~~~~~~~~~~~