I have seen postts before, but I can0t understand why my code is wrong!
plz if someone can give me some hint I would appreciate very much
here is my code:

#include <stdio.h>
double x[103],y[103],x2[103],y2[103],xp,yp;
int vx[5],vy[5],d[103],ord[103];

swap(int a, int b){
    int tmp=d[a],tmp2=ord[a];
    d[a]=d[b];ord[a]=ord[b];
    d[b]=tmp;ord[b]=tmp2;
}

sort(int n){
    int i,j;
    for(i=0;i<n;i++)
      for(j=0;j<n;j++)
        if(d[i]<d[j]) swap(i,j);
}

calc_v(int n){
   if(x[n]<x2[n]){
        vx[1]=vx[3]=x[n];
        vx[2]=vx[4]=x2[n];
   }
   else if (x[n]>=x2[n]){
        vx[1]=vx[3]=x2[n];
        vx[2]=vx[4]=x[n];
   }
   if(y[n]<y2[n]){
        vy[1]=vy[2]=y[n];
        vy[3]=vy[4]=y2[n];
   }
   else if (y[n]>=y2[n]){
        vy[1]=vy[2]=y2[n];
        vy[3]=vy[4]=y[n];
   }
}

dist(int n){
    if(xp>=vx[1] && xp<=vx[2]){
        if(yp>vy[3]) d[n]=abs(yp-vy[3]);
        else if (yp<vy[1]) d[n]=abs(vy[1]-yp);
        else d[n]=0;
    }
    else if(yp>=vy[1] && yp<=vy[3]){
        if(xp>vx[2]) d[n]=abs(xp-vx[2]);
        else if (xp<vx[1]) d[n]=abs(vx[1]-xp);
        else d[n]=0;
    }
    else{
      if(xp<vx[1]){
        if(yp<vy[1]) d[n]=sqrt(abs(xp-vx[1])*abs(xp-vx[1]) + abs(vy[1]-yp)*abs(vy[1]-yp));
        else if (yp>=vy[3])    d[n]=sqrt(abs(xp-vx[3])*abs(xp-vx[3]) + abs(vy[3]-yp)*abs(vy[3]-yp));
      }
      else if (xp>vx[2]){
            if(yp>vy[4]) d[n]=sqrt(abs(yp-vy[4])*abs(yp-vy[4]) + abs(xp-vx[4])*abs(xp-vx[4]));
            else if (yp<vy[2]) d[n]=sqrt(abs(vy[2]-yp)*abs(vy[2]-yp) + abs(xp-vx[2])*abs(xp-vx[2]));
      }
    }
}

int main()
{
  int n,i;
  scanf("%d",&n);
  for(i=0;i<n;i++)
    scanf("%Lf %Lf %Lf %Lf",&x[i],&y[i],&x2[i],&y2[i]);
  scanf("%Lf %Lf",&xp,&yp);
  for(i=0;i<n;i++){
    calc_v(i);
    dist(i);
  }
  for(i=0;i<n;i++) ord[i]=i;
   sort(n);
   n--;
   for(i=0;i<n;i++)
      printf("%d ",ord[i]+1);
   printf("%d\n",ord[n]+1);
  return 0;
}

Try test:
1
0 0 3 1
0 -1

answer isn't 1 ;)
keyword to solve this problem is "SQUARE" not rectangle;)

I don't understand
is valid this input?...
I thought there are only squares in the input
thanks for the reply anyway!