蒟蒻求教 为什么本地运行会溢出

#include<bits/stdc++.h>
using namespace std;
int compare_bigger(int a,int b)
{
    if(a>b)
      return a;
    else
      return b;
}
int main()
{
    int l,n,coordinate[5001],min,max,i,midleft,midright;
    cin>>l;
    cin>>n;
    for(i=0;i<n;i++)
      cin>>coordinate[i];
    for(i=0;i<n;i++)
      {if(coordinate[i]<=l/2) midleft=coordinate[i];
       else {midright=coordinate[i];break;}}
    min=compare_bigger(midleft,l-midright);
    max=compare_bigger(coordinate[n-1],l-coordinate[0]);
    cout<<min<<" "<<max; 
}