hao lan
#include<bits/stdc++.h> using namespace std; int n; int main(){ cin>>n; int bai=n/3600; int shi=n/60%60; int ge=n%60; cout<<setw(2)<<setfill('0')<<bai<<":"<<setw(2)<<setfill('0')<<shi<<":"<<setw(2)<<setfill('0')<<ge; return 0; }
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