String aa is a substring of string bb if it is possible to choose several consecutive letters in bb in such a way that they form aa. For example, string "for" is contained as a substring in strings "codeforces", "for" and "therefore", but is not contained as a substring in strings "four", "fofo" and "rof".
The first line contains an integer nn (1≤n≤1001≤n≤100) — the number of strings.
The next nn lines contain the given strings. The number of letters in each string is from 11 to 100100, inclusive. Each string consists of lowercase English letters.
Some strings might be equal.
If it is impossible to reorder nn given strings in required order, print "NO" (without quotes).
Otherwise print "YES" (without quotes) and nn given strings in required order.
5
a
aba
abacaba
ba
aba
YES
a
ba
aba
aba
abacaba
5
a
abacaba
ba
aba
abab
NO
3
qwerty
qwerty
qwerty
YES
qwerty
qwerty
qwerty
In the second example you cannot reorder the strings because the string "abab" is not a substring of the string "abacaba".
Description
Input
Output
Sample Input
Input
5 a aba abacaba ba aba
Output
YES a ba aba aba abacaba
Input
5 a abacaba ba aba abab
Output
NO
Input
3 qwerty qwerty qwerty
Output
YES qwerty qwerty qwerty
Hint
在第二个示例中,您不能对字符串重新排序,因为字符串“abab”不是字符串“abacaba”的子字符串。
解题思路:先按照字符串的长度升序排列(还可以在长度排序的基础上再按照字典序排序),如果对所有前面的字符串是后面字符串的子串,就是可以匹配的。
在做这道题的时候我本来以为会使用到KMP算法,加上KMP已经遗忘了,心里有点发憷,后来看到其他同学有做出来的,再看看数据量,不是很大,所以我自己写了一个字符串的匹配函数,不过还是花了好长的时间。
再看看题解,有使用STL中string的查找函数的,一直以来还没有时间看看STL,唉啊,还得学习啊
1 #include<stdio.h> 2 #include<string.h> 3 #include<algorithm> 4 using namespace std; 5 struct message 6 { 7 int len; 8 char s[110]; 9 } a[110]; 10 int my_comp(message a,message b) 11 { 12 int len1,len2; 13 len1=strlen(a.s); 14 len2=strlen(b.s); 15 if(len1<len2) 16 { 17 return 1; 18 } 19 else 20 { 21 return 0; 22 } 23 } 24 int my_pp(message a, message b)//匹配 25 { 26 int num = 0; 27 int n = strlen(b.s); 28 int m = strlen(a.s); 29 for(int j = 0; j <= n - m; ++j) 30 { 31 if(b.s[j] == a.s[0]) 32 { 33 int k = 0; 34 for(int i = 0; i < m; ++i) 35 { 36 if(b.s[j + i] == a.s[i]) 37 { 38 ++k; 39 } 40 else 41 { 42 break; 43 } 44 } 45 if(k == m) 46 { 47 return 1; 48 } 49 } 50 } 51 return 0; 52 } 53 int main() 54 { 55 int n,i,j,k,flag,count; 56 scanf("%d",&n); 57 getchar(); 58 for(i=0; i<n; i++) 59 { 60 gets(a[i].s); 61 } 62 sort(a,a+n,my_comp); 63 count=0; 64 flag=0; 65 for(i=0; i<n-1; i++) 66 { 67 flag=pp(a[i],a[i+1]); 68 if(flag==1) 69 { 70 count++; 71 } 72 73 } 74 if(count==n-1) 75 { 76 printf("YES "); 77 for(i=0; i<n; i++) 78 { 79 printf("%s ",a[i].s); 80 } 81 } 82 else 83 { 84 printf("NO "); 85 } 86 return 0; 87 }
STL 中 string
1 bool cmp(string a, string b) 2 { 3 if (a.length() == b.length()) return a < b; 4 return a.length() < b.length(); 5 } 6 int main() 7 { 8 int n; 9 string s[111]; 10 scanf("%d", &n); 11 for (int i = 0; i < n; i++) cin >> s[i]; 12 sort(s, s + n, cmp); 13 bool f = 1; 14 for (int i = 1; i < n; i++) 15 { 16 if (s[i].find(s[i-1]) == string::npos) 17 { 18 f = 0; 19 break; 20 } 21 } 22 if (f) 23 { 24 cout << "YES" << endl; 25 for (int i = 0; i < n; i++) cout << s[i] << endl; 26 } 27 else 28 { 29 cout << "NO" << endl; 30 } 31 return 0; 32 }
find函数:在一个字符串中查找指定的单个字符或字符组。如果找到,就返回首次匹配的开始位置;如果没有找到匹配的内容,
则返回string::npos。一般有两个输入参数,一个是待查询的字符串,一个是查询的起始位置,默认起始位置为0.