C :

#include<stdio.h>

int leap(int y)
{
	return y%4==0&&y%100!=0||y%400==0?1:0;
}

int main()
{
	int t,y,m,d,i,s;
	scanf("%d",&t);
	while(t--)
	{
		scanf("%d-%d-%d",&y,&m,&d);
		s=6570;
		if(m==2&&d==29)
		{
			if(!leap(y+18))
				printf("-1\n");
			else
			{
				for(i=y+1;i<=y+18;i++)
					if(!leap(i))
						s--;
				printf("%d\n",s);
			}
		}
		else
		{
			if(m<=2)
			{
				for(i=y;i<y+18;i++)
					if(leap(i))
						s++;
			}
			else
				for(i=y+1;i<=y+18;i++)
					if(leap(i))
						s++;
			printf("%d\n",s);
		}
	}
	return 0;
}

C++ :

#include<stdio.h>

int leap(int y)
{
	return y%4==0&&y%100!=0||y%400==0?1:0;
}

int main()
{
	int t,y,m,d,i,s;
	scanf("%d",&t);
	while(t--)
	{
		scanf("%d-%d-%d",&y,&m,&d);
		s=6570;
		if(m==2&&d==29)
		{
			if(!leap(y+18))
				printf("-1\n");
			else
			{
				for(i=y+1;i<=y+18;i++)
					if(!leap(i))
						s--;
				printf("%d\n",s);
			}
		}
		else
		{
			if(m<=2)
			{
				for(i=y;i<y+18;i++)
					if(leap(i))
						s++;
			}
			else
				for(i=y+1;i<=y+18;i++)
					if(leap(i))
						s++;
			printf("%d\n",s);
		}
	}
	return 0;
}

Java :

public class Main {
public static void main(String[] args) {
	java.util.Scanner in = new java.util.Scanner(System.in);
	while (in.hasNext()) {
		int N=in.nextInt();
		for(int i=0;i<N;i++) {
			String [] a=in.next().split("-");
			int b=Integer.parseInt(a[0]);
			int c=Integer.parseInt(a[1]);
			int d=Integer.parseInt(a[2]);
			int sum=0;
			if(c==2&&d==29)
				if((b%4==0&&b%100!=0)||b%400==0) {
					System.out.println(-1);continue;}
			for(int n=b;n<=b+17;n++) {
				if((n%4==0&&n%100!=0)||n%400==0) {
					sum=sum+366;
				}
				else
					sum=sum+365;
			}	
				int n=b;int x=0;
				for(int j=1;j<c;j++) {
					if(j==1||j==3||j==5||j==7||j==8||j==10||j==12) {
						x=x+31;
					}
					if(j==4||j==6||j==9||j==11) {
						x=x+30;
					}
					if(j==2) {
					if((n%4==0&&n%100!=0)||n%400==0){
						x=x+29;
					}
					else 
						x=x+28;
					}
			}
				x=x+d;
				sum=sum-x;
			int f=b+18;
			for(int j=1;j<c;j++) {
				if(j==1||j==3||j==5||j==7||j==8||j==10||j==12) {
					sum=sum+31;
				}
				if(j==4||j==6||j==9||j==11) {
					sum=sum+30;
				}
				if(j==2) {
					if((f%4==0&&f%100!=0)||f%400==0){
						sum =sum+29;
					}
					else 
						sum=sum+28;
					}
				}
			sum=sum+d;
			System.out.println(sum);
		}
	}
	in.close();
}
}