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Memory and Trident(CodeForces 712B)

时间:2018-10-05 19:02:01      阅读:124      评论:0      收藏:0      [点我收藏+]

标签:cst   ssi   dash   cstring   img   pst   walk   codeforce   define   

Description

Memory is performing a walk on the two-dimensional plane, starting at the origin. He is given a string s with his directions for motion:

  • An ‘L‘ indicates he should move one unit left.
  • An ‘R‘ indicates he should move one unit right.
  • A ‘U‘ indicates he should move one unit up.
  • A ‘D‘ indicates he should move one unit down.

But now Memory wants to end at the origin. To do this, he has a special trident. This trident can replace any character in s with any of ‘L‘, ‘R‘, ‘U‘, or ‘D‘. However, because he doesn‘t want to wear out the trident, he wants to make the minimum number of edits possible. Please tell Memory what is the minimum number of changes he needs to make to produce a string that, when walked, will end at the origin, or if there is no such string.

Input

The first and only line contains the string s (1 ≤ |s| ≤ 100 000) — the instructions Memory is given.

Output

If there is a string satisfying the conditions, output a single integer — the minimum number of edits required. In case it‘s not possible to change the sequence in such a way that it will bring Memory to to the origin, output -1.

Sample Input

Input
RRU
Output
-1
Input
UDUR
Output
1
Input
RUUR
Output
2

Hint

In the first sample test, Memory is told to walk right, then right, then up. It is easy to see that it is impossible to edit these instructions to form a valid walk.

In the second sample test, Memory is told to walk up, then down, then up, then right. One possible solution is to change s to "LDUR". This string uses 1 edit, which is the minimum possible. It also ends at the origin.

题解:水题。

代码如下:

技术分享图片
 1 #include<iostream>
 2 #include<cstdio>
 3 #include<cstdlib>
 4 #include<cstring>
 5 #include<string>
 6 #include<cmath>
 7 #include<map>
 8 #include<stack>
 9 #include<vector>
10 #include<queue>
11 #include<set>
12 #include<algorithm>
13 #define max(a,b)   (a>b?a:b)
14 #define min(a,b)   (a<b?a:b)
15 #define swap(a,b)  (a=a+b,b=a-b,a=a-b)
16 #define maxn 320007
17 #define N 100000000
18 #define INF 0x3f3f3f3f
19 #define mod 1000000009
20 #define e  2.718281828459045
21 #define eps 1.0e18
22 #define PI acos(-1)
23 #define lowbit(x) (x&(-x))
24 #define read(x) scanf("%d",&x)
25 #define put(x) printf("%d\n",x)
26 #define memset(x,y) memset(x,y,sizeof(x))
27 #define Debug(x) cout<<x<<" "<<endl
28 #define lson i << 1,l,m
29 #define rson i << 1 | 1,m + 1,r
30 #define ll long long
31 //std::ios::sync_with_stdio(false);
32 //cin.tie(NULL);
33 using namespace std;
34 
35 char a[111111];
36 int b[4];
37 int main()
38 {
39     cin>>a;
40     int l=strlen(a);
41     if(l%2)
42     {
43         cout<<"-1"<<endl;
44         return 0;
45     }
46     for(int i=0;i<l;i++)
47     {
48         if(a[i]==L)
49             b[0]++;
50         if(a[i]==R)
51             b[0]--;
52         if(a[i]==U)
53             b[1]++;
54         if(a[i]==D)
55             b[1]--;
56     }
57     //cout<<b[0]<<" "<<b[1]<<endl;
58     cout<<(abs(b[0])+abs(b[1]))/2<<endl;
59     return 0;
60 }
View Code

 

Memory and Trident(CodeForces 712B)

标签:cst   ssi   dash   cstring   img   pst   walk   codeforce   define   

原文地址:https://www.cnblogs.com/baiyi-destroyer/p/9745339.html

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