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#include<cstdio> const int CLK_TCK=100; int main(){ int C1,C2; scanf("%d%d",&C1,&C2); int shi,fen,chamiao=(C2-C1)/100; shi=chamiao/3600; chamiao%=3600; fen=chamiao/60; chamiao=chamiao%60; if((C2-C1)%100>=50)chamiao++; printf("%02d:%02d:%02d",shi,fen,chamiao); return 0; }
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