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  • Bomb HDU

    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? 

    InputThe 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. 
    OutputFor each test case, output an integer indicating the final points of the power.Sample Input

    3
    1
    50
    500

    Sample Output

    0
    1
    15
    
    
            
     

    Hint

    From 1 to 500, the numbers that include the sub-sequence "49" are "49","149","249","349","449","490","491","492","493","494","495","496","497","498","499",
    so the answer is 15.

    这道题放在写过找0和找1的后面。。。我在写这题之前刚写过62的那道题,结果就感觉比较简单了。。。果然水题比较好写,至少比上一道好写。。。
    #include <stdio.h>
    #include <stdlib.h>
    #include <iostream>
    #include <algorithm>
    #include <queue>
    #include <vector>
    #include <math.h>
    #include <string.h>
    using namespace std;
    #define INF 0x3f3f3f3f
    #define N 20
    #define PI acos(-1)
    #define mod 2520
    #define LL long long
    /********************************************************/
    LL dp[80][20][5],d[80];
    
    LL dfs(int now, int up, int p, int fp)
    {
        if(now==1) return p;
        if(!fp&&dp[now][up][p]!=-1) return dp[now][up][p];
        LL ans=0;
        int len=fp?d[now-1]:9;
    
        for(int i=0;i<=len;i++)
        {
            if((up==4&&i==9)||p==1)
                ans+=dfs(now-1, i, 1, fp&&i==len);
            else
                ans+=dfs(now-1, i, 0, fp&&i==len);
        }
    
        if(!fp) dp[now][up][p]=ans;
        return ans;
    }
    
    LL solve(LL X)
    {
        int len=0;
        memset(dp,-1,sizeof(dp));
    
        while(X)
        {
            d[++len]=X%10;
            X/=10;
        }
    
        LL sum=0;
        for(int i=0;i<=d[len];i++)
            sum+=dfs(len, i, 0, i==d[len]);
        return sum;
    }
    
    int main()
    {
        LL n,m;
        int T;
        scanf("%d", &T);
        while(T--)
        {
            scanf("%lld",&n),
            printf("%lld
    ", solve(n));
        }
        return 0;
    }
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  • 原文地址:https://www.cnblogs.com/zct994861943/p/8393672.html
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