洛谷 [蓝桥杯 2020 省 AB2] 回文日期

#include <iostream>
using namespace std;

int d[13] = {0,31,28,31,30,31,30,31,31,30,31,30,31};

bool is_valid(int i){
	int year = i / 10000;
	i = i % 10000;
	int month = i / 100;
	i = i % 100;
	int day = i;
	
	if ( (year%4 == 0 && year%100!= 0) || (year%400==0) ){ //闰年 
		if ( month==2 && day > 29){
			return false;
		}
	}
	if (month > 13 || month == 0){
		return false;
	}
	if(day > d[month] || day == 0){
		return false;
	}
	return true;
}
bool is_hui(int i){
	int year = i / 10000;
	i = i % 10000;
	int month = i / 100;
	i = i % 100;
	int day = i;
	
	int i_1 = month % 10;
	int i_2 = month / 10;
	int sum_1 = i_1*10 + i_2;
	
	int i_3 = day % 10;
	int i_4 = day / 10;
	int sum_2 = i_3*10 + i_4;
	
	if (sum_1 + sum_2*100 == year){
		return true;
	}
	return false;
}
bool is_ab(int i){
	int i_1 = i % 10;
	i = i / 10;
	int i_2 = i % 10;
	i = i / 10;
	int i_3 = i % 10;
	i = i / 10;
	int i_4 = i % 10;
	i = i / 10;
	int i_5 = i % 10;
	i = i / 10;
	int i_6 = i % 10;
	i = i / 10;
	int i_7 = i % 10;
	i = i / 10;
	int i_8 = i;
	if ( (i_1 == i_3) && (i_3 == i_6) && (i_6 == i_8) ){
		if ( (i_2 == i_4) && (i_4 == i_5) && (i_5 == i_7) ){
			
			return true;
		}
	}
	return false;
}
int main (){
	int n;
	cin>>n;
	int flag = 0;
	
	for (int i = n+1;i < 99999999;i++){
		if(is_valid(i) && is_hui(i)){
			cout<<i<<endl;
			break;
		}
	}
	
	for (int i = n+1;i < 99999999;i++){
		if(is_valid(i) && is_ab(i)){
			cout<<i;
			break;
		}
	}
	return 0;
} 
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