hdu2072
#include<iostream> #include<cstdio> #include<queue> #include<algorithm> #include<cmath> #include<ctime> #include<set> #include<map> #include<stack> #include<cstring> #include<sstream> #pragma GCC optimize(2) #define inf 2147483647 #define ls rt<<1 #define rs rt<<1|1 #define lson ls,nl,mid,l,r #define rson rs,mid+1,nr,l,r #define N 1000010 #define For(i,a,b) for(int i=a;i<=b;++i) #define p(a) putchar(a) #define g() getchar() using namespace std; string c,s; int t,cnt,ans,num,w; struct node{ node *next[26]; int now; }; bool b[N]; node *root=new node(); node *p; void in(int &x){ int y=1;char c=g();x=0; while(c<'0'||c>'9'){if(c=='-')y=-1;c=g();} while(c<='9'&&c>='0'){ x=(x<<1)+(x<<3)+c-'0';c=g();} x*=y; } void o(int x){ if(x<0){p('-');x=-x;} if(x>9)o(x/10); p(x%10+'0'); } void Insert(string c){ p=root; For(i,0,c.size()-1){ t=c[i]-'a'; if(p->next[t]==0) p->next[t]=new node(); p=p->next[t]; } p->now++; if(p->now==1) ans++; } void clear(){ ans=0; num=0; root=new node(); } int main(){ while(getline(cin,s)){ if(s=="#") return 0; clear(); istringstream ss(s); while(ss>>c) Insert(c); o(ans);p('\n'); } return 0; }
字典树裸题,字符串的末节点出现次数++,次数为一的贡献了答案。
主要收获是读入的技巧