#includeint day_tab[2][13]={{0,31,28,31,30,31,30,31,31,30,31,30,31},{0,31,29,31,30,31,30,31,31,30,31,30,31}};int day_year(int year,int month,int day){ int i,j; i=!(year%4)?1:0; printf("%d",i); for(j=1;j<month;j++)day=day+day_tab[0][j]; if(i==1)return day; elsereturn day-1;}main(){ i...
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