maxlmb2023 @ 2023-10-02 13:27:31
#include<cstdio>
#include<iostream>
#include<algorithm>
using namespace std;
int schw(int x)
{
int a = x % 10;
x /= 10;
int b = x % 10;
x /= 10;
int c = x % 10;
x /= 10;
int d = x % 10;
x /= 10;
int ans = 0;
ans = ans * 10 + a;
ans = ans * 10 + b;
ans = ans * 10 + c;
ans = ans * 10 + d;
ans = ans * 10 + d;
ans = ans * 10 + c;
ans = ans * 10 + b;
ans = ans * 10 + a;
return ans;
}
const int D[] = {0,31,29,31,30,31,30,31,31,30,31,30,31};
int a, b, aa, bb, ans = 0;
bool IsDate(int x)
{
int y, m, d;
y = x / 10000;
m = x / 100 % 100;
d = x % 100;
if(m <= 0 || m >= 13) return 0;
if(D[m] != d) return 0;
return 1;
}
int main()
{
cin >> a>> b;
aa = a / 10000;
bb = b / 10000;
for(int i = aa; i <= bb; i++)
{
int j = schw(i);
if(IsDate(j) && a <= j && j <= b) ans++;
}
cout << ans;
return 0;
}30分，wa的输出比标准答案小。
by danzai10 @ 2023-10-05 21:13:04
#include<bits/stdc++.h>
using namespace std;
int month[15]={0,31,29,31,30,31,30,31,31,30,31,30,31};
int x,y,sum;
int main(){
cin>>x>>y;
for(int i=1;i<=12;i++){
for(int j=1;j<=month[i];j++){
int k=j%10*1000+(j/10)*100+(i%10)*10+(i/10);
k=k*10000+i*100+j;
if(k>=x&&k<=y){
sum++;
}
}
}
cout<<sum;
return 0;
}