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http://acm.hdu.edu.cn/showproblem.php?pid=4150
Some dangerous Witches invaded the garden city! As a righteous magician, james0zan want to find the most powerful incantation so he can beat those dangerous witches easily.
After consulted one hundred and eight thousand Magic Books, james0zan find a way to calculate the power of an incantation. There is a very short incantation called “magic index” which contains the magic power, and each incantation’s power can be calculated by the times the “magic index” appearance in the incantation. Notice that if two “magic index” overlapped, the power only should be calculated once. And we just want the incantation more powerful. That is to say, if the “magic index” is “aa”, the power of incantation “aaaa” is 2(“aa”+”aa”), not 1(“a”+”aa”+”a”) or 3.
The first line is an integer t (t<=30), the number of test cases. Each of the next t lines contains two strings, represent the incantation (length<=10^6) and the “magic index” (length<=5). Every char in the incantation and the magic index is lowercase.
For each test case you should output the power of the incantation.
3
aaaa aa
bsdjfassdiifo sd
papapapapapapap ap
2
2
7
由于模式串很短所以直接暴力即可。。
1 #include<algorithm> 2 #include<iostream> 3 #include<cstdlib> 4 #include<cstring> 5 #include<cstdio> 6 #include<vector> 7 #include<map> 8 using std::cin; 9 using std::cout; 10 using std::endl; 11 using std::find; 12 using std::sort; 13 using std::map; 14 using std::pair; 15 using std::vector; 16 using std::multimap; 17 #define pb(e) push_back(e) 18 #define sz(c) (int)(c).size() 19 #define mp(a, b) make_pair(a, b) 20 #define all(c) (c).begin(), (c).end() 21 #define iter(c) decltype((c).begin()) 22 #define cls(arr,val) memset(arr,val,sizeof(arr)) 23 #define cpresent(c, e) (find(all(c), (e)) != (c).end()) 24 #define rep(i, n) for (int i = 0; i < (int)(n); i++) 25 #define tr(c, i) for (iter(c) i = (c).begin(); i != (c).end(); ++i) 26 const int N = 1000011; 27 typedef unsigned long long ull; 28 char text[N], pat[10]; 29 int main() { 30 #ifdef LOCAL 31 freopen("in.txt", "r", stdin); 32 freopen("out.txt", "w+", stdout); 33 #endif 34 int t; 35 scanf("%d", &t); 36 while (t--) { 37 scanf("%s %s", text, pat); 38 char *p = text; 39 int ans = 0, len = strlen(pat); 40 while (p = strstr(p, pat)) { 41 ans++; 42 p += len; 43 } 44 printf("%d\n", ans); 45 } 46 return 0; 47 }
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原文地址：http://www.cnblogs.com/GadyPu/p/4624066.html
