The 12th Blue Bridge Cup

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#include<iostream>

using namespace std;

long long n;
long long second;

int main(){
    
	cin>>n;
	second=n/1000;
	
	long long sec=second%60;
	long long min=(second/60)%60;
	long long h=(second/3600)%24;
	
	if(sec<10){
    
		if(min<10){
    
			if(h<10)
				cout<<0<<h<<":"<<0<<min<<":"<<0<<sec<<endl;
			else
				cout<<h<<":"<<0<<min<<":"<<0<<sec<<endl;
		}
		else{
    
			if(h<10)
				cout<<0<<h<<":"<<min<<":"<<0<<sec<<endl;
			else
				cout<<h<<":"<<min<<":"<<0<<sec<<endl;
		}
	}
	else{
    
		if(min<10){
    
			if(h<10)
				cout<<0<<h<<":"<<0<<min<<":"<<sec<<endl;
			else
				cout<<h<<":"<<0<<min<<":"<<sec<<endl;
		}
		else{
    
			if(h<10)
				cout<<0<<h<<":"<<min<<":"<<sec<<endl;
			else
				cout<<h<<":"<<min<<":"<<sec<<endl;
		}
	}
	
	return 0;
}

The final output can be less troublesome , direct printf("%02d:%02d:%02d",h,m,s); In this form