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Can anyone help me to find test case on which following code fails?

#include<iostream>
#include<cstdio>
#include<algorithm>

using namespace std;

int a[30200],s[30200]={0};

int main(){


int t,r,maxx,minn,maxind,minind1,minind2,i,l=0,nice,k=1;
cin>>t;
while(t--){
scanf("%d", &r);
for(i=1;i<r;i ...