注意去重

代码如下：

#include <algorithm>
#include <string.h>
#include <iostream>
#include <stdio.h>
#include <string>
#include <vector>
#include <queue>
#include <map>
#include <set>
using namespace std;

struct node
{
	int year,month,day;
}book[3];

int cmp(node a,node b)
{
	if(a.year==b.year)
	{
		if(a.month==b.month)
		{
			return a.day>b.day;
		}
		return a.month>b.month;
	}
	return a.year>b.year;
}

int Day[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 vis[2100][13][32];

int pan(int year)  //闰年
{
	if(year%4==0 && year%100!=0 || year%400==0)
		return 1;
	return 0;
}

int dayjudge(int day,int k,int month)  //天数合法
{
	if(Day[k][month]<day || day<1)
		return 0;
	return 1;
}

int monthjudge(int month)  //月份合法
{
	if(month<1 || month>12)
		return 0;
	return 1;
}

int sj(int year)  //年份
{
	if(year>=60 && year<=99)
		return year+1900;
	return year+2000;
}

int adc(const char a[])  //转换
{
	int data=(a[0]-'0')*10+(a[1]-'0');
	return data;
}

int main()
{
	int i,j,cnt=0;
	char s[10],data[3][3];
	cin>>s;
	memset(vis,0,sizeof(vis));
	for(i=0;i<3;i++)
	{
		for(j=0;j<2;j++)
			data[i][j]=s[cnt++];
		data[i][j]=0;
		cnt++;
	}
	int year,month,day,t;
	for(i=cnt=0;i<3;i++)
	{
		if(i==0)
		{
			year=adc(data[0]);
			year=sj(year);
			month=adc(data[1]);
			day=adc(data[2]);
			t=pan(year); //平年或闰年
			if(!monthjudge(month))
				continue;
			if(!dayjudge(day,t,month))
				continue;
			book[cnt].year=year;
			book[cnt].month=month;
			book[cnt].day=day;
			vis[year][month][day]=1;
			cnt++;
		}
		else if(i==2)
		{
			year=adc(data[2]);
			year=sj(year);
			month=adc(data[0]);
			day=adc(data[1]);
			t=pan(year); //平年或闰年
			if(!monthjudge(month))
				continue;
			if(!dayjudge(day,t,month))
				continue;
			book[cnt].year=year;
			book[cnt].month=month;
			book[cnt].day=day;
			if(vis[year][month][day])
				continue;
			vis[year][month][day]=1;
			cnt++;
		}
		else
		{
			year=adc(data[2]);
			year=sj(year);
			month=adc(data[1]);
			day=adc(data[0]);
			t=pan(year); //平年或闰年
			if(!monthjudge(month))
				continue;
			if(!dayjudge(day,t,month))
				continue;
			book[cnt].year=year;
			book[cnt].month=month;
			book[cnt].day=day;
			if(vis[year][month][day])
				continue;
			vis[year][month][day]=1;
			cnt++;
		}
	}
	sort(book,book+cnt,cmp);
	while(cnt)
	{
		printf("%d-%02d-%02d\n",book[cnt-1].year,book[cnt-1].month,book[cnt-1].day);
		cnt--;
	}
	return 0;
}