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#include <bits/stdc++.h>
 
using namespace std;
 
string onceInATram(int x) {
    // Complete this function
 
 
 
 
                    	int a,x1,y,z,i,i1,z1,z2;
     string s,s1,s3;
                    a=x/1000;
                    y=x%1000;
                    x1=a;
 
                    while(x1>0){
                    	z=z+x1%10;
                    	x1=x1/10;
                    }cout<<"z="<<a<<"    "<<y<<"     "<<z;
 
                     for(int i=y+1;i<1000;i++)
                {
                	int i2=i;
 
                	while(i2>0)
                	{
                		z1=z1+i2%10;
                		i2=i2/10;
                		if( z1 ==z ){
                			z2=z1;
    	cout <<  "total="<<z1<<"  num   "<<i1<< endl;
 
             	}  	i1=i;
 
             	if( z1 ==z){break;
                		} }z1=0;i2=0;	if(z2==z){break;
                }}          s = to_string(i1);
                           s1 = to_string(x);
                            s3=s1+s;
                      string result=stoi(s3);
                            cout << "\n"<<x;
 
}
 
int main() {
    int x=555555;
  //  cin >> x;
  //  string result = onceInATram(x);
    cout << "result"<<result << endl;
    return 0;
}

prog.cpp: In function ‘std::__cxx11::string onceInATram(int)’:
prog.cpp:41:41: error: conversion from ‘int’ to non-scalar type ‘std::__cxx11::string {aka std::__cxx11::basic_string<char>}’ requested
                       string result=stoi(s3);
                                     ~~~~^~~~
prog.cpp: In function ‘int main()’:
prog.cpp:50:23: error: ‘result’ was not declared in this scope
     cout << "result"<<result << endl;
                       ^~~~~~

Standard output is empty