CodeForces 515A

A. Drazil and Date
time limit per test
1 second
memory limit per test
256 megabytes
input
standard input
output
standard output

Someday, Drazil wanted to go on date with Varda. Drazil and Varda live on Cartesian plane. Drazil's home is located in point (0, 0) and Varda's home is located in point (a, b). In each step, he can move in a unit distance in horizontal or vertical direction. In other words, from position (x, y) he can go to positions (x + 1, y), (x - 1, y), (x, y + 1) or (x, y - 1).

Unfortunately, Drazil doesn't have sense of direction. So he randomly chooses the direction he will go to in each step. He may accidentally return back to his house during his travel. Drazil may even not notice that he has arrived to (a, b) and continue travelling.

Luckily, Drazil arrived to the position (a, b) successfully. Drazil said to Varda: "It took me exactly s steps to travel from my house to yours". But Varda is confused about his words, she is not sure that it is possible to get from (0, 0) to (a, b) in exactly s steps. Can you find out if it is possible for Varda?

Input

You are given three integers a, b, and s ( - 109 ≤ a, b ≤ 109, 1 ≤ s ≤ 2·109) in a single line.

Output

If you think Drazil made a mistake and it is impossible to take exactly s steps and get from his home to Varda's home, print "No" (without quotes).

Otherwise, print "Yes".

Sample test(s)
Input
5 5 11
Output
No
Input
10 15 25
Output
Yes
Input
0 5 1
Output
No
Input
0 0 2
Output
Yes
Note

In fourth sample case one possible route is: .

 

刚才做了这套题的b题，感觉很简单，以为A可能会难一点，结果A题更水。

状态并不是很好，身体难受，就让我水一水吧。

这道题又第一发错在没看数据范围，人家有负数情况。。。

思路很简单，如果步数够到达对应的点，就看，剩下的部分能否被 2 整除，能被 2 整除，就说明能到达。否则，就不能到达。

 1 #include <iostream>
 2 #include <cstdio>
 3 #include <cstring>
 4 #include <algorithm>
 5 #include <queue>
 6 #include <cmath>
 7 using namespace std;
 8 
 9 int main()
10 {
11     int x, y, s;
12     while(cin >> x >> y >> s)
13     {
14         int dis = abs(x) + abs(y);
15         if((s - dis) >= 0 && (s - dis) % 2 == 0)
16             cout << "Yes" << endl;
17         else
18             cout << "No" << endl;
19     }
20 
21     return 0;
22 }
View Code

 

posted @ 2015-03-20 21:29  unicoe  阅读(234)  评论(0)  编辑  收藏  举报