Codeforces Round #250 (Div. 2)—A. The Child and Homework

     好题啊，被HACK了。曾经做题都是人数越来越多。这次比赛 PASS人数 从2000直掉 1000人  被HACK  1000多人！

没见过的科技啊

1 2 4 8 这组数 被黑的

A. The Child and Homeworktime limit per test

1 second

memory limit per test

256 megabytes

input

standard input

output

standard output

Once upon a time a child got a test consisting of multiple-choice questions as homework. A multiple-choice question consists of four choices: A, B, C and D.
Each choice has a description, and the child should find out the only one that is correct.

Fortunately the child knows how to solve such complicated test. The child will follow the algorithm:

• If there is some choice whose description at least twice shorter than all other descriptions, or at least twice longer than all other descriptions, then the child thinks the choice is great.
• If there is exactly one great choice then the child chooses it. Otherwise the child chooses C (the child think it is the luckiest choice).

You are given a multiple-choice questions, can you predict child’s choose?

Input

The first line starts with "A." (without quotes), then followed the description of choice A.
The next three lines contains the descriptions of the other choices in the same format. They are given in order: B, C, D. Please
note, that the description goes after prefix "X.", so the prefix mustn’t be counted in description’s length.

Each description is non-empty and consists of at most 100 characters. Each character can be either uppercase English letter or lowercase English letter, or "_".

Output

Print a single line with the child’s choice: "A", "B", "C"
or "D" (without quotes).

Sample test(s)input

A.VFleaKing_is_the_author_of_this_problem
B.Picks_is_the_author_of_this_problem
C.Picking_is_the_author_of_this_problem
D.Ftiasch_is_cute

output

D

input

A.ab
B.abcde
C.ab
D.abc

output

C

input

A.c
B.cc
C.c
D.c

output

B

Note

In the first sample, the first choice has length 39, the second one has length 35, the third one has length 37, and the last one has length 15. The choice D (length
15) is twice shorter than all other choices’, so it is great choice. There is no other great choices so the child will choose D.

In the second sample, no choice is great, so the child will choose the luckiest choice C.

In the third sample, the choice B (length 2) is twice longer than all other choices’, so it is great choice. There is no other great choices so the child will
choose B.

AC：

#include <iostream>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <algorithm>
const int N = 110;
using namespace std;
char a[10][N];
int s[10];
int main()
{
    for(int i = 0;i<4;i++)
    {
        scanf("%s",a[i]);
        s[i] = strlen(a[i]);
        s[i] -=2;
    }
        int flag = 0,flag1 = 0;
        sort(s,s+4);
        int ma = s[3];
        int mi = s[0];
        for(int i = 1;i<4;i++)
        {
            if(s[0]==0)
                break;
            if((s[i]/s[0])>=2)
            {
               flag++;
            }
        }
        for(int i = 0;i<3;i++)
        {
            if(s[i]==0)
                break;
            if((s[3]/s[i])>=2)
            {
                flag1++;            }
        }        if(flag1==3 && flag!=3)
        {
            for(int i = 0;i<4;i++)
            {
                int len = strlen(a[i]);
                len -= 2;
                if(len==ma)
                {
                    printf("%c",'A'+i);
                }
            }
        }
       else if(flag==3 && flag1!=3)
        {
            for(int i = 0;i<4;i++)
            {
                int len = strlen(a[i]);
                len -=2;
                if(len==mi)
                {
                    printf("%c",'A'+i);
                }
            }
        }
        else
            printf("C\n");    return 0;
}