标签:des style blog color java os strong io
3 Alice Bob Smith John Alice Smith 5 a c c d d e b e a d 0
Yes No
最近做字典树的题挺频繁的,自然而然又想到了字典树,把人名分成编号 TIME:15ms
#include <iostream> #include <cstdio> #include <cstring> #include <cstdlib> #include <algorithm> using namespace std; struct node{ int bianhao; node *next[52]; }; node *root; struct no{ int u,v,next; }g[2010]; int head[2010]; int rudu[1010]; int t,l; struct node *make() { node *p = new node; for(int i = 0;i<52;i++) { p->next[i] = NULL; } p->bianhao = 0; return p; } void make_() { root = (struct node *)malloc(sizeof(struct node)); for(int i = 0;i<52;i++) { root->next[i] = NULL; } root->bianhao = 0; } int INsert(char *s) { int len = strlen(s); int num; node *p =root; for(int i = 0;i<len;i++) { if('A'<=s[i] && s[i]<='Z') num = s[i] - 'A'; else num = s[i] - 'a'; if(p->next[num]==NULL) { p->next[num] = make(); } p = p->next[num]; } if(p->bianhao==0) { t++; p->bianhao = t; } return p->bianhao; } void add(int a, int b) { g[l].u = b; g[l].v = b; g[l].next = head[a]; head[a] = l++; } int aa[2010],ll; void TOPSort() { int i,j,k; for(i = 1;i<=t;i++) { if(rudu[i]==0) { ll++; } if(ll>1) break; // printf("ll = %d\n",ll); /* for(j = 1;j<=t;j++) { if(rudu[j]==0) { ll++; rudu[j]--; for(k = head[j];k!=0;k = g[k].next) { rudu[g[k].v]--; } break; } }*/ } } int main() { int n; char a[20],b[20]; while(scanf("%d",&n),n) { t = 0,l = 1,ll=0; make_(); memset(rudu,0,sizeof(rudu)); memset(head,-1,sizeof(head)); for(int i = 0;i<n;i++) { scanf("%s%s",a,b); int u = INsert(a); int v = INsert(b); // printf("%s %d\n",a,u); // printf("%s %d\n",b,v); add(u,v); rudu[v]++; } TOPSort(); if(ll==1) puts("Yes"); else puts("No"); } return 0; }
HDU 2094 产生冠军 (字典树+拓扑),布布扣,bubuko.com
标签:des style blog color java os strong io
原文地址:http://blog.csdn.net/wjw0130/article/details/38338283