#include <stdio.h>
int main()
{
int S,h,m,s;
S=3721; //秒単位の時間秒単位の時間
h=S/3600; //○○時間
m=S%3600/60; //○○分
s=S%3600%60; //○○秒
printf("%dは%d:%d:%d",S
,h
,m
,s
);
return 0;
}
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