Compilare: user.cpp: In function ‘bool checkstr(char*, char*)’: user.cpp:13:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<strlen(b);++i) ^ user.cpp: In function ‘int main()’: user.cpp:24:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(strlen(s)>=mmx) {mmx=strlen(s);x++;strcpy(t[x],s);strcpy(r,t[x]);} ^ user.cpp:26:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=x;i++) if(strlen(t[i])==mmx && strcmp(t[i],r)<0) strcpy(r,t[i]); ^