Compilare: user.cpp: In function ‘int main()’: user.cpp:18:15: warning: suggest parentheses around assignment used as truth value [-Wparentheses] for(i=a;j=b;i) ^ user.cpp:18:17: warning: for increment expression has no effect [-Wunused-value] for(i=a;j=b;i) ^ user.cpp:23:5: warning: iteration 2147483647u invokes undefined behavior [-Waggressive-loop-optimizations] for(;nr;nr--) ^ user.cpp:23:5: note: containing loop