OJ-Problems-Source/HDOJ/3555_autoAC.cpp

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#include<iostream>
#include<cstring>
#include<cstdio>
using namespace std;
long long dp[20][3];
int digit[20];
int main()
{
memset(dp,0,sizeof(dp));
dp[0][0] = 1;
for(int i=1; i<20; i++)
{
dp[i][0] = dp[i-1][0] * 10 - dp[i-1][1];
dp[i][1] = dp[i-1][0];
dp[i][2] = dp[i-1][2] * 10 + dp[i-1][1];
}
int t;
cin >> t;
while(t--)
{
int len = 0,last=0;
long long ans = 0;
unsigned long long n=0;
cin >> n;
n++;
memset(digit,0,sizeof(digit));
while(n)
{
digit[++len] = n%10;
n/=10;
}
bool flag = false;
for(int i =len; i>=1; i--)
{
ans += dp[i-1][2] * digit[i];
if(flag)
ans += dp[i-1][0] * digit[i];
if(!flag && digit[i] >4)
ans += dp[i-1][1];
if(last == 4 && digit[i] == 9)
flag = true;
last = digit[i];
}
cout << ans << endl;
}
return 0;
}