Compilare: user.c: In function ‘gap’: user.c:30:43: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if(gx[gc]<gx[g]-1||gx[gc]==gx[g]-1&&gr[gc]<=gr[g])++gc; ^ user.c: In function ‘merge’: user.c:24:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.c: In function ‘gap’: user.c:34:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ user.c: In function ‘main’: user.c:42:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("tradare.in","r",stdin); ^ user.c:43:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("tradare.out","w",stdout); ^ user.c:45:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i",&t); ^ user.c:48:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%i%i%i",&n,&m,&k); ^ user.c:49:23: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] fr(i,0,k)scanf("%i%i",x+i,y+i),--x[i],--y[i]; ^