HDU 1501 Zipper
2016-08-10 15:58
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http://acm.hdu.edu.cn/showproblem.php?pid=1501
Given three strings, you are to determine whether the third string can be formed by combining the characters in the first two strings. The first two strings can be mixed arbitrarily, but each must stay in its original order.
For example, consider forming “tcraete” from “cat” and “tree”:String A: cat
String B: tree
String C: tcraete
As you can see, we can form the third string by alternating characters from the two strings. As a second example, consider forming “catrtee” from “cat” and “tree”:
String A: cat
String B: tree
String C: catrtee
Finally, notice that it is impossible to form “cttaree” from “cat” and “tree”.
Input
The first line of input contains a single positive integer from 1 through 1000. It represents the number of data sets to follow. The processing for each data set is identical. The data sets appear on the following lines, one data set per line.
For each data set, the line of input consists of three strings, separated by a single space. All strings are composed of upper and lower case letters only. The length of the third string is always the sum of the lengths of the first two strings. The first two strings will have lengths between 1 and 200 characters, inclusive.
Output
For each data set, print:
Data set n: yes
if the third string can be formed from the first two, or
Data set n: no
if it cannot. Of course n should be replaced by the data set number. See the sample output below for an example.
Sample Input
3
cat tree tcraete
cat tree catrtee
cat tree cttaree
Sample Output
Data set 1: yes
Data set 2: yes
Data set 3: no
就比如上述的案例 。
把字符串从前往后看,它的第一个字符是第一个或者第二个的第一个字符,选定后,做个标记,继续往后,倒数第二个是除去上面那个,新的字符串的第一个或者第二个的第一个字符,依次论推。
Zipper
Problem DescriptionGiven three strings, you are to determine whether the third string can be formed by combining the characters in the first two strings. The first two strings can be mixed arbitrarily, but each must stay in its original order.
For example, consider forming “tcraete” from “cat” and “tree”:String A: cat
String B: tree
String C: tcraete
As you can see, we can form the third string by alternating characters from the two strings. As a second example, consider forming “catrtee” from “cat” and “tree”:
String A: cat
String B: tree
String C: catrtee
Finally, notice that it is impossible to form “cttaree” from “cat” and “tree”.
Input
The first line of input contains a single positive integer from 1 through 1000. It represents the number of data sets to follow. The processing for each data set is identical. The data sets appear on the following lines, one data set per line.
For each data set, the line of input consists of three strings, separated by a single space. All strings are composed of upper and lower case letters only. The length of the third string is always the sum of the lengths of the first two strings. The first two strings will have lengths between 1 and 200 characters, inclusive.
Output
For each data set, print:
Data set n: yes
if the third string can be formed from the first two, or
Data set n: no
if it cannot. Of course n should be replaced by the data set number. See the sample output below for an example.
Sample Input
3
cat tree tcraete
cat tree catrtee
cat tree cttaree
Sample Output
Data set 1: yes
Data set 2: yes
Data set 3: no
题意
这个题是说给你三个字符串,你判断第三个能不能由前两个组成,而且前两个字符串的顺序是不可以乱的。就比如上述的案例 。
把字符串从前往后看,它的第一个字符是第一个或者第二个的第一个字符,选定后,做个标记,继续往后,倒数第二个是除去上面那个,新的字符串的第一个或者第二个的第一个字符,依次论推。
#include <stdio.h> #include <iostream> #include<math.h> #include <string.h> #include <algorithm> using namespace std; char a[201],b[201],c[402]; int dp[201][201]; int main() { int t,i,j,la,lb,ca; scanf("%d",&t); for(ca=1;ca<=t;ca++) { scanf("%s%s%s",a+1,b+1,c+1); la=strlen(a+1); lb=strlen(b+1); memset(dp,0,sizeof(dp)); for(i=1;i<=la;i++) if(a[i]==c[i]) dp[i][0]=1; for(i=1;i<=lb;i++) if(b[i]==c[i]) dp[0][i]=1; for(i=1;i<=la;i++) for(j=1;j<=lb;j++) dp[i][j]=(dp[i-1][j]&&(a[i]==c[i+j]))||(dp[i][j-1]&&(b[j]==c[i+j])); printf("Data set %d: ",ca); if(dp[la][lb]==1) printf("yes\n"); else printf("no\n"); } return 0; }
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