Problem Description
The counter-terrorists found a time bomb in the dust. But this time the terrorists improve on the time bomb. The number sequence of the time bomb counts from 1 to N. If the current number sequence includes the sub-sequence "49", the power of the blast would add one point.
Now the counter-terrorist knows the number N. They want to know the final points of the power. Can you help them?
Input
The first line of input consists of an integer T (1 <= T <= 10000), indicating the number of test cases. For each test case, there will be an integer N (1 <= N <= 2^63-1) as the description.
The input terminates by end of file marker.
Output
For each test case, output an integer indicating the final points of the power.
Sample Input
3 1 50 500
Sample Output
0 1 15
要49
可以参考这个题:点这里
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
int a[20];
ll dp[25][3];
ll dfs(int pos,int sta,bool limit)
{
if(pos==-1) return sta==2;
if(!limit && dp[pos][sta]!=-1) return dp[pos][sta];
int up=limit ? a[pos] : 9;
ll tmp=0;
for(int i=0;i<=up;i++)
{
int tsta=sta;
if(sta==0&&i==4)
tsta=1;
else if(sta==1&&i!=4&&i!=9)
tsta=0;
else if(sta==1&&i==9)
tsta=2;
tmp+=dfs(pos-1,tsta,limit && i==a[pos]);
}
if(!limit) dp[pos][sta]=tmp;
return tmp;
}
ll solve(ll x)
{
int pos=0;
while(x)
{
a[pos++]=x%10;
x/=10;
}
return dfs(pos-1,0,true);
}
int main()
{
ll n;
memset(dp,-1,sizeof dp);
int T;
cin>>T;
while(T--)
{
scanf("%lld",&n);
printf("%lld\n",solve(n));
}
return 0;
}