UESTC 1034 AC Milan VS Juventus 分情况讨论

AC Milan VS Juventus

Time Limit: 3000/1000MS (Java/Others) Memory Limit: 65535/65535KB (Java/Others)

Kennethsnow and Hlwt both love football.

One day, Kennethsnow wants to review the match in 2003 between AC Milan and Juventus for the Championship Cup. But before the

penalty shootout. he fell asleep.

The next day, he asked Hlwt for the result. Hlwt said that it scored a:b in the penalty shootout.

Kennethsnow had some doubt about what Hlwt said because Hlwt is a fan of Juventus but Kennethsnow loves AC Milan.

So he wanted to know whether the result can be a legal result of a penalty shootout. If it can be, output Yes, otherwise output No.

The rule of penalty shootout is as follows:

There will be 5 turns, in each turn, 2 teams each should take a penalty shoot. If goal, the team get 1 point. After each shoot, if the
winner can be confirmed(i.e: no matter what happened after this shoot, the winner will not change), the match end immediately.
If after 5 turns the 2 teams score the same point. A new turn will be added, until that one team get a point and the other not in a turn.

Before the penalty shootout begins, the chief referee will decide which team will take the shoot first, and afterwards, two teams will take shoot

one after the other. Since Kennethsnow fell asleep last night, he had no idea whether AC Milan or Juventus took the first shoot.

Input

The only line contains 2 integers a, b. Means the result that Hlwt said.

0≤a,b≤10

Output

Output a string Yes or No, means whether the result is legal.

Sample input and output

Sample Input	Sample Output
3 2	Yes
2 5	No

Hint

The Sample 1 is the actual result of the match in 2003.

The Sample 2, when it is 2:4 after 4 turns, AC Milan can score at most 1point in the next turn. So Juventus has win when it is 2:4. So the result cannot be 2:5.

This story happened in a parallel universe. In this world where we live, kennethsnow is a fan of Real Madrid.

Source

The 13th UESTC Programming Contest Preliminary

The question is from here.

My Solution

分情况讨论清楚就好。然后注意 a == b 的时候也是No

把分类出来的区间理清楚。不要条件里面混杂着不该包括的东西

#include <iostream>
#include <cstdio>
#include <cmath>
using namespace std;

int main()
{
    int a, b;
    scanf("%d%d", &a, &b);
    if(a == b )printf("No");
    else if((a == 5 && b <5) || (b == 5&& a <5)) {if(abs(a-b) >= 3) printf("No");else printf("Yes"); }  //!!
    else if(a < 5 && b <5) {if(abs(a-b) >= 4) printf("No");else printf("Yes"); }
    else {if(abs(a-b) > 1) printf("No");else printf("Yes"); }
    return 0;
}

Thank you all!