UVA230

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Borrowers

Abridged problem statement

給定書名與作者 與 借還書歷史。在看到 SHELVE 時印出需要被上架的書籍的一些資訊。

Solution sketch

就模擬吧！ 很煩的那種…

AC code

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#include <bits/stdc++.h>
using namespace std;
struct Entry {
    string title;
    string author;
    bool inStock;
    bool pending;
    Entry(string title, string author, bool inStock)
    {
        this->title = title;
        this->author = author;
        this->inStock = inStock;
        this->pending = false;
    }
    bool operator<(const Entry &other) const
    {
        if (author == other.author)
            return title < other.title;
        return author < other.author;
    }
};
void clean(char *str)
{
    int len = strlen(str);
    while (str[len - 1] == '\n' || str[len - 1] == '\r') {
        str[len - 1] = '\0';
        len--;
    }
}
int main()
{
    char inp[10000];
    vector<Entry> data;
    while (fgets(inp, 10000, stdin) != NULL) {
        if (strcmp(inp, "END\n") == 0)
            break;
        clean(inp);
        int len = strlen(inp);
        int quote = -1;
        for (int i = 0; i < len; i++) {
            if (inp[i] == '"') {
                if (quote == -1)
                    quote = i;
                else {
                    quote = i;
                    break;
                }
            }
        }
        char title[10000] = {'\0'}; // bitch, \0 is required
        strncpy(title, inp + 1, quote - 1);
        char author[10000] = {'\0'};
        strncpy(author, inp + quote + 5, len - (quote + 5));
        data.push_back(Entry(title, author, true));
    }
    sort(data.begin(), data.end());
    while (fgets(inp, 10000, stdin) != NULL) {
        if (inp[0] == 'E')
            break;
        clean(inp);
        if (inp[0] == 'B') {
            string inp1 = inp;
            string title = inp1.substr(8, inp1.length() - 9);
            for (int i = 0; i < (int)data.size(); i++)
                if (data[i].title == title) {
                    data[i].inStock = false;
                    data[i].pending = false;
                }
        } else if (inp[0] == 'R') {
            string inp1 = inp;
            string title = inp1.substr(8, inp1.length() - 9);
            for (int i = 0; i < (int)data.size(); i++)
                if (data[i].title == title) {
                    data[i].pending = true;
                }
        } else {
            // shelve
            int prev = -1;
            for (int i = 0; i < (int)data.size(); i++) {
                if (data[i].inStock)
                    prev = i;
                if (data[i].pending == true) {
                    if (prev == -1)
                        printf("Put \"%s\" first\n", data[i].title.c_str());
                    else
                        printf("Put \"%s\" after \"%s\"\n", data[i].title.c_str(),
                               data[prev].title.c_str());
                    data[i].pending = false;
                    data[i].inStock = true;
                    prev = i;
                }
            }
            printf("END\n");
        }
    }
    return 0;
}