1857B - Maximum Rounding - CodeForces Solution

#include<bits/stdc++.h>
using namespace std;
//#define int long long
typedef pair<int,int> PII;
//const int N = 

void solve()
{
    string s;
    cin>>s;
   
    if(s[0]>='5') 
    {
    	cout<<"1";
    	for(int i=0;i<s.size();i++)
    	{
    		cout<<"0";
		}
		cout<<endl;
		return;
	}
	int j=-1;
    for(int i=s.size()-1;i>=1;i--)
    {
    	if(s[i]>='5') 
    	{
    		s[i-1]++;
    		j=i;
		}
	}
	if(j==-1) cout<<s<<endl;
	else
	{
		if(s[0]>='5') 
	    {
	    	cout<<"1";
	    	for(int i=0;i<s.size();i++)
	    	{
	    		cout<<"0";
			}
			cout<<endl;
			return;
		}
		for(int i=0;i<j;i++)
		{
			cout<<s[i];
		}
		for(int i=j;i<s.size();i++)
		{
			cout<<"0";
		}
		cout<<endl;
	}
	
}
signed main()
{
    std::ios::sync_with_stdio(false);
    std::cin.tie(0);
    int t;
    cin>>t;
    while(t--)
    {
		solve();
    }
    return 0;
}