HDOJ 5071: Chat

题目链接:

http://acm.hdu.edu.cn/showproblem.php?pid=5071

题意:

模拟QQ窗口聊天序列的若干操作,输出结果。

算法:

模拟。

直接用一个vector或者queue来模拟窗口序列。

另外找一个数组或map来记录说的词的数量。

额外用一个变量来记录当前“always on top”的是谁。

代码:

#include 
#include 
#include 
using namespace std;

char command[20];
vector a;
map cot;
int top;

inline int get_top()
{
    if (top != -1)
    {
        return top;
    }
    if (!a.empty())
    {
        return a[0];
    }
    return -1;
}

inline int index_of(int x)
{
    for (int i = 0; i < a.size(); i ++)
    {
        if (a[i] == x)
        {
            return i;
        }
    }
    return -1;
}

inline void move_first(int x)
{
    int tmp = a[x];
    for (int i = x; i > 0; i --)
    {
        a[i] = a[i - 1];
    }
    a[0] = tmp;
}

int main()
{
    int cas;
    scanf("%d", &cas);
    while (cas --)
    {
        int n;
        scanf("%d", &n);
        a.clear();
        cot.clear();
        top = -1;
        for (int tot = 1; tot <= n; tot ++)
        {
            scanf("%s", command);
            printf("Operation #%d: ", tot);
            if (command[0] == 'A')
            {
                int x;
                scanf("%d", &x);
                if (cot.find(x) != cot.end())
                {
                    puts("same priority.");
                }
                else
                {
                    a.push_back(x);
                    cot[x] = 0;
                    puts("success.");
                }
            }
            else if ((command[0] == 'C') && (command[1] == 'l'))
            {
                int x;
                scanf("%d", &x);
                if (cot.find(x) != cot.end())
                {
                    if (top == x)
                    {
                        top = -1;
                        if (cot[x] > 0)
                        {
                            printf("Bye %d: %I64d\n", x, cot[x]);
                        }
                    }
                    printf("close %d with %I64d.\n", x, cot[x]);
                    for (int i = index_of(x); i + 1 < a.size(); i ++)
                    {
                        a[i] = a[i + 1];
                    }
                    a.pop_back();
                    cot.erase(x);
                }
                else
                {
                    puts("invalid priority.");
                }
            }
            else if ((command[0] == 'C') && (command[1] == 'h') && (command[2] == 'a'))
            {
                int c;
                scanf("%d", &c);
                if (!a.empty())
                {
                    cot[get_top()] += c;
                    puts("success.");
                }
                else
                {
                    puts("empty.");
                }
            }
            else if (command[0] == 'R')
            {
                int x;
                scanf("%d", &x);
                if (x <= a.size())
                {
                    move_first(x - 1);
                    puts("success.");
                }
                else
                {
                    puts("out of range.");
                }
            }
            else if (command[0] == 'P')
            {
                if (!a.empty())
                {
                    int x = 0;
                    for (int i = 0; i < a.size(); i ++)
                    {
                        if (a[i] > a[x])
                        {
                            x = i;
                        }
                    }
                    move_first(x);
                    puts("success.");
                }
                else
                {
                    puts("empty.");
                }
            }
            else if ((command[0] == 'C') && (command[1] == 'h') && (command[2] == 'o'))
            {
                int x;
                scanf("%d", &x);
                int index = index_of(x);
                if (index != -1)
                {
                    move_first(index);
                    puts("success.");
                }
                else
                {
                    puts("invalid priority.");
                }
            }
            else if (command[0] == 'T')
            {
                int x;
                scanf("%d", &x);
                if (cot.find(x) != cot.end())
                {
                    top = x;
                    puts("success.");
                }
                else
                {
                    puts("invalid priority.");
                }
            }
            else if (command[0] == 'U')
            {
                if (top != -1)
                {
                    top = -1;
                    puts("success.");
                }
                else
                {
                    puts("no such person.");
                }
            }
        }
        if (top != -1)
        {
            if (cot[top] > 0)
            {
                printf("Bye %d: %I64d\n", top, cot[top]);
            }
        }
        for (int i = 0; i < a.size(); i ++)
        {
            int x = a[i];
            if ((x != top) && (cot[x] > 0))
            {
                printf("Bye %d: %I64d\n", x, cot[x]);
            }
        }
    }
    return 0;
}


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