Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:21:16: error: ‘strlen’ was not declared in this scope int x=strlen(s),i,m=x-1; ^ user.cpp:22:7: error: ‘i’ was not declared in this scope for (i=n-1;i;i--) ^ user.cpp:24:4: error: ‘m’ was not declared in this scope m=i; ^ user.cpp:28:20: error: ‘sort’ was not declared in this scope sort(s+i+1,s+n+1); ^ user.cpp:21:6: warning: unused variable ‘x’ [-Wunused-variable] int x=strlen(s),i,m=x-1; ^