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  • HDU------checksum

    Quicksum

    Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)
    Total Submission(s): 3401 Accepted Submission(s): 2095
     
    Problem Description
    A checksum is an algorithm that scans a packet of data and returns a single number. The idea is that if the packet is changed, the checksum will also change, so checksums are often used for detecting transmission errors, validating document contents, and in many other situations where it is necessary to detect undesirable changes in data.

    For this problem, you will implement a checksum algorithm called Quicksum. A Quicksum packet allows only uppercase letters and spaces. It always begins and ends with an uppercase letter. Otherwise, spaces and letters can occur in any combination, including consecutive spaces.

    A Quicksum is the sum of the products of each character's position in the packet times the character's value. A space has a value of zero, while letters have a value equal to their position in the alphabet. So, A=1, B=2, etc., through Z=26. Here are example Quicksum calculations for the packets "ACM" and "MID CENTRAL":

    ACM: 1*1 + 2*3 + 3*13 = 46MID CENTRAL: 1*13 + 2*9 + 3*4 + 4*0 + 5*3 + 6*5 + 7*14 + 8*20 + 9*18 + 10*1 + 11*12 = 650
     
    Input
    The input consists of one or more packets followed by a line containing only # that signals the end of the input. Each packet is on a line by itself, does not begin or end with a space, and contains from 1 to 255 characters.
     
    Output
    For each packet, output its Quicksum on a separate line in the output.

     
    Sample Input
    ACM
    MID CENTRAL
    REGIONAL PROGRAMMING CONTEST
    ACN
    A C M
    ABC
    BBC
    #
     
    Sample Output
    46
    650
    4690
    49
    75
    14
    15
     
     
    Source
    Mid-Central USA 2006
     
    Recommend
    teddy
     
     1 #include <string.h>
     2 #include <stdio.h>
     3 
     4 int main()
     5 {
     6     char str[10000];
     7     int len,i,a[26],sum;
     8     for(i = 0;i<26;i++)
     9     {
    10         a[i] = i+1;
    11     }
    12     while(gets(str))
    13     {
    14         if(strcmp(str,"#") == 0)
    15         break;
    16         len = strlen(str);
    17         sum = 0;
    18         for(i = 0;i<len;i++)
    19         {
    20             if(str[i]>='A' && str[i]<='Z')
    21             sum+=(i+1)*a[str[i]-'A'];
    22         }
    23         printf("%d
    ",sum);
    24     }
    25 
    26     return 0;
    27 }
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  • 原文地址:https://www.cnblogs.com/MICE1024/p/5775603.html
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