统计难题
http://acm.hdu.edu.cn/showproblem.php?pid=1251
題解:字典樹裸題
/* *@Author: STZG *@Language: C++ */ #include <bits/stdc++.h> #include<iostream> #include<algorithm> #include<cstdlib> #include<cstring> #include<cstdio> #include<string> #include<vector> #include<bitset> #include<queue> #include<deque> #include<stack> #include<cmath> #include<list> #include<map> #include<set> //#define DEBUG #define RI register int using namespace std; typedef long long ll; //typedef __int128 lll; const int N=10000000+10; const int MOD=1e9+7; const double PI = acos(-1.0); const double EXP = 1E-8; const int INF = 0x3f3f3f3f; int t,n,m,k,q; int ans,cnt,flag,temp; int a[N][26]; char str[10]; bool en[N]; int sum[N]; void insert(string s){int len=s.size(),p=0;for(int i=0;i<len;i++){int ch=s[i]-'a';if(a[p][ch]==0)a[p][ch]=++cnt;p=a[p][ch];sum[p]++;//cout<<sum[p]<<endl;}en[p]=1; } int search(char *str){int len=strlen(str),p=0;for(int i=0;i<len;i++){int ch=str[i]-'a';p=a[p][ch];if(p==0)return 0;}return sum[p]; } int main() { #ifdef DEBUGfreopen("input.in", "r", stdin);//freopen("output.out", "w", stdout); #endif//scanf("%d",&n);//scanf("%d",&t);string s;while(getline(cin,s)){if(s[0]=='\0')break;insert(s);}while(~scanf("%s",str)){cout<<search(str)<<endl;}//cout << "Hello world!" << endl;return 0; }?
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