int isLeapYear(int year)
{
return year%4==0&&year%100!=0||year%400=0;
}
int day_of_year(int year, int month, int day)
{
const int m[12]={31,28,31,30,31,30,31,31,30,31,30,31};
int i,s=day;
for(i=0;i
if(isLeapYear(year))
s++;
return s;
}
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