Hi!
Here is my source - I compiled it on Visual C++ and it is OK - but
here got "compilation Error". Could anyone explain me why???



#include <stdio.h>
long x1,x2,y1,y2,ymin,ymax,n,i,posy,disttt;


void main()
{
    bool boo;
    boo=false;
    scanf("%ld",&n);
    scanf("%ld%ld%ld%ld",&x1,&y1,&x2,&y2);
    disttt=0;
    posy=1;
    ymin=y1;
    ymax=y2;
    for(i=1;i<n;i++)
    {
        scanf("%ld%ld%ld%ld",&x1,&y1,&x2,&y2);
        if(y1>=ymax-1||y2<=ymin+1)
        {
            printf("-1\n");
            boo=true;;
        }
        if (posy<=y1)
        {
            disttt+=(y1+1-posy);
            posy=y1+1;
        }
        else if (posy>=y2)
        {
            disttt+=posy-y2+1;
            posy=y2-1;
        }
        ymin=y1;
        ymax=y2;
    }
    disttt+=x2-2;
    if (posy>y2-1) disttt+=posy+1-y2;
    else if(posy<y2-1) disttt+=y2-1-posy;
    if (boo==false) printf("%ld\n",disttt);
}



Thanks!

Try replacing y1 with y1_ and y2 with y2_.
You will get accepted.
The same thing happened to me.

Do not use bool,the compiler may not support this

I think my code is right,but it was getting wa wa all the time.
So I started to change it.
I saw the code above,so I changed mine more and more like that.
But a surprising thing ,my code is even equal to the code above,
but it got accepted,but my still wa.
I wonder..............

my code
#include<iostream>
#include<string>
#include<memory>
using namespace std;

int main(void)
{
    long n;
    cin>>n;
       long nowy=1,i,maxy,miny,x1,y1,x2,y2;
    long dist=0;
    cin>>x1>>miny>>x2>>maxy;
    bool ok=true;
    for(i=1;i<n;++i){
         cin>>x1>>y1>>x2>>y2;
        if(y1>=maxy-1||y2<=miny+1){
            ok=false;
            break;
        }
           if(y1>=nowy){
               dist+=y1+1-nowy;
               nowy=y1+1;
        }
        else if(y2<=nowy){
              dist+=nowy-y2+1;
            nowy=y2-1;
        }
        miny=y1;
        maxy=y2;
    }
    if(ok){
        dist+=x2-2;
        //dist+=abs(y2-1-nowy);
        if(nowy>y2-1)dist+=nowy+1-y2;
        else if(nowy<y2-1)dist+=y2-1-nowy;
        cout<<dist<<endl;
    }
    else cout<<"-1"<<endl;
    return 0;
}

Now this code get AC.