shivratri, C++ (gcc)

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#include<bits/stdc++.h>
#include<string>
using namespace std;
#define SCD(t) scanf("%d",&t)
#define SCLD(t) scanf("%ld",&t)
#define SCLLD(t) scanf("%lld",&t)
#define SCC(t) scanf("%c",&t)
#define SCS(t) scanf("%s",t)
#define SCF(t) scanf("%f",&t)
#define SCLF(t) scanf("%lf",&t)
#define MEM(a, b) memset(a, (b), sizeof(a))
#define FOR(i, j, k, in) for (int i=j ; i<k ; i+=in)
#define RFOR(i, j, k, in) for (int i=j ; i>=k ; i-=in)
void solve(string s,long int d)
{   
    long int l=s.size(),j=0,i,a[l];
    for(i=0;i<l;i++)
    {
        a[i]=s[i];
    }
    if(a[l-1]>d)
    {
        a[l-1]=d;
    }
    for(i=0;i<l-1;i++)
    {
        
        if(a[i]>a[j+1])
        {
            if(a[i]==0)
            {
                while(a[i]==0)
                { j++;}
                i=0;
            }
            a[i]=0;
            i=0;
            j++;
        }
    }
    for(i=0;i<l;i++)
    cout<<a[i];
}

int main()
{
  int t;
  SCD(t);
  while(t--)
  {
      
      long int n,d;
      SCLD(n);
      SCLD(d); 
      string s;
      s=to_string(n);
      solve(s,d);
  }
}

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Compilation time: 1.42 sec, absolute running time: 0.07 sec, cpu time: 0.01 sec, memory peak: 3 Mb, absolute service time: 1,53 sec