Compilare: user.cpp: In function ‘int cmp(int, int)’: user.cpp:14:11: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(a[k][i]==a[k][j]) ^ user.cpp: In function ‘void rec(int, int, int)’: user.cpp:38:15: warning: unused variable ‘nr’ [-Wunused-variable] int s,nr=0; ^ user.cpp: In function ‘int main()’: user.cpp:56:11: warning: unused variable ‘j’ [-Wunused-variable] { int i,j,s; ^ user.cpp:56:13: warning: unused variable ‘s’ [-Wunused-variable] { int i,j,s; ^