Phone List Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 26137 Accepted: 7896
Description
Given a list of phone numbers, determine if it is consistent in the sense that no number is the prefix of another. Let's say the phone catalogue listed these numbers:
Emergency 911Alice 97 625 999Bob 91 12 54 26In this case, it's not possible to call Bob, because the central would direct your call to the emergency line as soon as you had dialled the first three digits of Bob's phone number. So this list would not be consistent.
Input
The first line of input gives a single integer, 1 ≤ t ≤ 40, the number of test cases. Each test case starts with n, the number of phone numbers, on a separate line, 1 ≤ n ≤ 10000. Then follows n lines with one unique phone number on each line. A phone number is a sequence of at most ten digits.
Output
For each test case, output "YES" if the list is consistent, or "NO" otherwise.
Sample Input
2 3 911 97625999 91125426 5 113 12340 123440 12345 98346
Sample Output
NO YES
Source
Nordic 2007Trie樹模板題
注意這道題的字符串不是有序的,所以要全部插入後再判斷。
據說快排也可以過...
#include#include #include #include #include #include #define F(i,j,n) for(int i=j;i<=n;i++) #define D(i,j,n) for(int i=j;i>=n;i--) #define ll long long #define pa pair #define maxn 100005 using namespace std; int tot=0,t,n; bool flag; struct trie_type { int tag,next[10]; }tree[maxn]; char s[10005][11]; inline void insert(char *ch) { int p=0,l=strlen(ch); F(i,0,l-1) { int tmp=ch[i]-'0'; if (!tree[p].next[tmp]) tree[p].next[tmp]=++tot; p=tree[p].next[tmp]; } tree[p].tag++; } inline void judge(char *ch) { if (!flag) return; int p=0,l=strlen(ch); F(i,0,l-2) { int tmp=ch[i]-'0'; p=tree[p].next[tmp]; if (tree[p].tag) { flag=false; return; } } } int main() { scanf("%d",&t); while (t--) { F(i,0,tot) { F(j,0,9) tree[i].next[j]=0; tree[i].tag=0; } tot=0; scanf("%d",&n); F(i,1,n) { scanf("%s",s[i]); insert(s[i]); } flag=true; F(i,1,n) judge(s[i]); if (flag) puts("YES"); else puts("NO"); } }