Compilare: user.cpp: In function ‘int rezolvare(char*)’: user.cpp:28:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(a);i++) ^ user.cpp:62:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i;j<strlen(a);j++) ^ user.cpp:78:11: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(a[j]=='x' && !isdigit(a[j-1])) ^ user.cpp:86:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^