C :

#include<stdio.h>
int main()
{
    int n,year,month,day,sum;
    int a[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
    while(~scanf("%d",&n))
    {
        while(n--)
        {
            scanf("%d%d%d",&year,&month,&day);
            sum=0;
            if((year%4==0&&year%100!=0)||(year%400==0))
            {
                    a[2]=29;
                    for(int i=1;i<month;i++)
                    {
                        sum+=a[i];
                    }
            }
            else
            {
                a[2]=28;
                for(int i=1;i<month;i++)
                {
                    sum+=a[i];
                }
            }
            sum+=day;
            printf("%d\n",sum);
        }
    }
    return 0;
}

C++ :

#include <stdio.h>

int a[] = {0,31,28,31,30,31,30,31,31,30,31,30,31};

int b[] = {0,31,29,31,30,31,30,31,31,30,31,30,31};

int isL(int n)

{
    if((n % 4 == 0 && n % 100) || n % 400 == 0)
        return 1;
    return 0;
}
int main()

{
    int n;
    int year,month,day;
    while(~scanf("%d",&n))
    {
        while(n--)
        {
            scanf("%d%d%d",&year,&month,&day);
            int sum = 0;
            if(isL(year))
            {
                for(int i = 0;i < month;++i)
                    sum += b[i];
                sum += day;
            }
            else
            {
                for(int i = 0;i < month;++i)
                    sum += a[i];
                sum += day;
            }
            printf("%d\n",sum);
        }
    }
    return 0;
}