Fitness Exercise

https://www.codechef.com/problems/EXERCISE

For this problem, I have tried to make a solution with ranges. That is to check if the range is valid or not. But I am not able to figure out for what cases it is failing.

#include<bits/stdc++.h>
using namespace std;
const int inf=1000001;
int main()
{
int arr[100000],range[100000][2]; //left right
int t;
cin>>t;
while(t--)
{
    int n;
    cin>>n;
    for(int i=0;i<n;i++)
        cin>>arr[i];
    string s;
    cin>>s;
    if(arr[0]==-1)
    {
        range[0][0]=0;
        range[0][1]=inf;
    }
    else
    {
        range[0][0]=range[0][1]=arr[0];
    }
    for(int i=1;i<n;i++)
    {
        char c=s[i-1];
        if(c=='<')
        {
            if(arr[i-1]!=-1)
                range[i][0]=arr[i-1]+1;
            else
                range[i][0]=range[i-1][0]+1;
            range[i][1]=inf;
        }
        else if(c=='=')
        {
            if(arr[i-1]!=-1)
                range[i][0]=range[i][1]=arr[i-1];
            else
            {
                range[i][0]=range[i-1][0];
                range[i][1]=range[i-1][1];
            }
        }
        else if(c=='>')
        {
            range[i][0]=0;
            if(arr[i-1]!=-1)
                range[i][1]=arr[i-1]-1;
            else
                range[i][1]=range[i-1][1]-1;
        }
    }
    bool ok=true;
    for(int i=0;i<n;i++)
    {
        if(arr[i]==-1)
        {
            if(range[i][0]>range[i][1])
                ok=false;
        }
        else
        {
            if(range[i][0]>range[i][1] || arr[i]<range[i][0] || arr[i]>range[i][1] || range[i][1]<0)
                ok=false;
        }
        if(!ok)
        {
            break;
        }
    }
    if(ok)
        cout<<"YES"<<endl;
    else
        cout<<"NO"<<endl;
}
}

You cant’t? Why should others however?