Help me in solving SLOWSOLN problem

help
,
1

My issue

what’s wrong with my code?
It is showing that i missed a hidden test case

My code

#include <bits/stdc++.h>
using namespace std;

int main() {
    int t;int k;
    cin>>t;
	// your code goes here
for(int i=1;i<=t;i++){
    int maxt,maxn,sumn;
    cin>>maxt>>maxn>>sumn;
    int itr=0;
    if(sumn%maxn==0){
    if(sumn/maxn <= maxt){
        k=sumn/maxn;
    for(int j=1;j<=k;j++){
        itr=itr+(maxn*maxn);
    }}
    else{
         k=maxt;
    for(int j=1;j<=k;j++){
        itr=itr+(maxn*maxn);
    }   
        
    }
        
        cout<<itr<<endl;}
    
    else{
         for(int j=1;j<=sumn/maxn;j++){
        itr=itr+(maxn*maxn);
    }
    itr=itr+pow(sumn%maxn,2);
    cout<<itr<<endl;
    }
}
}

Problem Link: Slow Solution Practice Coding Problem