WA两个求助大神！！！

#include<iostream>
#include<string>
#include<algorithm>
using namespace std;
struct bir
{
	string name;
	int year;
	int month;
	int day;
	int h;
};
bool cmp(bir a,bir b)
{
	if(a.year<b.year) return 1;
	else if(a.year>b.year) return 0;
	if(a.month<b.month) return 1;
	else if(a.month>b.month) return 0;
	if(a.day<b.day) return 1;
	else if(a.day>b.day) return 0;
	if(a.h<b.h) return 1;
	else return 0;
}
bir b[105];
int main()
{
	int n;
	cin>>n;
	for(int i=0;i<n;i++)
	{
		string ln;
		int ly,lm,ld;
		cin>>ln>>ly>>lm>>ld;
		b[i].name=ln;
		b[i].year=ly;
		b[i].month=lm;
		b[i].day=ld;
		b[i].h=i;
	}
	sort(b,b+n,cmp);
	for(int i=0;i<n;i++)
	{
		cout<<b[i].name<<endl;
	}
	return 0;
}