100%ac

#include<iostream>
#define ll int
#define cc char
using namespace std;
int main(){
    ll n,sum=0,cnt1=0;
    cc a;
    cin>>n>>a;
    for(ll i=1;i<=n;i++){
        if(sum+i>n)break;
        sum+=i;
        cnt1++;
    }
    ll cnt=n-sum;
    for(ll i=1;i<=cnt1;i++){
        for(ll j=1;j<=i;j++)
            cout<<"*";
        cout<<endl;
    }
    cout<<cnt;
    return 0;
}