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  • 1124 Raffle for Weibo Followers (20分)

    John got a full mark on PAT. He was so happy that he decided to hold a raffle(抽奖) for his followers on Weibo -- that is, he would select winners from every N followers who forwarded his post, and give away gifts. Now you are supposed to help him generate the list of winners.

    Input Specification:

    Each input file contains one test case. For each case, the first line gives three positive integers M (≤ 1000), N and S, being the total number of forwards, the skip number of winners, and the index of the first winner (the indices start from 1). Then M lines follow, each gives the nickname (a nonempty string of no more than 20 characters, with no white space or return) of a follower who has forwarded John's post.

    Note: it is possible that someone would forward more than once, but no one can win more than once. Hence if the current candidate of a winner has won before, we must skip him/her and consider the next one.

    Output Specification:

    For each case, print the list of winners in the same order as in the input, each nickname occupies a line. If there is no winner yet, print Keep going... instead.

    Sample Input 1:

    9 3 2
    Imgonnawin!
    PickMe
    PickMeMeMeee
    LookHere
    Imgonnawin!
    TryAgainAgain
    TryAgainAgain
    Imgonnawin!
    TryAgainAgain
    
     

    Sample Output 1:

    PickMe
    Imgonnawin!
    TryAgainAgain
    
     

    Sample Input 2:

    2 3 5
    Imgonnawin!
    PickMe
    
     

    Sample Output 2:

    Keep going...

    已知M,N,S

    M是人数,从S个人开始,每隔N个人进行抽取(抽到重复的就抽下一个),打印这些人。

    如果抽取0人,则打印Keep going...

    #include <iostream>
    #include <map>
    using namespace std;
    int M, N, S;
    char arr[99999][25];
    map<string, bool> m;
    int main() {
        scanf("%d%d%d", &M, &N, &S);
        for(int i = 1; i <= M; i++) 
            scanf("%s", arr[i]);
        for(int i = S; i <= M; i += N) {
            while(i <= M && m[arr[i]] == 1) i++;
            if(i > M) break;
            printf("%s
    ", arr[i]);
            m[arr[i]] = 1;
        }
        if(m.size() == 0) printf("Keep going...
    ");
        return 0;
    }
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  • 原文地址:https://www.cnblogs.com/littlepage/p/12837124.html
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