Compilare: user.cpp: In function ‘int main()’: user.cpp:23:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(v);i++) a[(int)v[i]]++; ^ user.cpp:24:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(m);i++) b[(int)m[i]]++; ^ user.cpp:25:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<strlen(v);i++) if(a[(int)v[i]]!=b[(int)v[i]]) { cout<<"0\n"; return 0; } ^ user.cpp:21:10: warning: unused variable ‘ok’ [-Wunused-variable] bool ok=1; ^