小记:这题其实是比较水的,尤其是数据,看discuss里别人都是用int存的,30位的数int能存的下??!!
思路:trie树来hash,记录每一个值出现的次数,次数最多的就是答案。
这里要注意的就是0, 如果用trie树, 它输入000和00 你必须判断是同一个数0. 或者002和000002.
所以这里要必须去掉前置0,然后再插入
代码:
#include <iostream>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>
#include <map>
#include <set>
#include <vector>
#include <stack>
#include <queue>
#include <algorithm>
using namespace std;
#define mst(a,b) memset(a,b,sizeof(a))
#define REP(a,b,c) for(int a = b; a < c; ++a)
#define eps 10e-8
#define MAX 10
const int MAX_ = 100010;
const int N = 500000;
const int INF = 0x7fffffff;
char str[MAX_];
typedef struct Node{
int isStr;
struct Node *next[MAX];
Node():isStr(0){
memset(next, NULL, sizeof(next));
}
~Node(){
for(int i = 0;i < MAX; ++i)
if(next[i] != NULL)
delete next[i];
}
}TrieNode,*Trie;
Trie root;
int Insert(char *s){
while(*s == '0')++s;
TrieNode *p = root;
while(*s){
if(p ->next[*s-'0'] == NULL){
p ->next[*s-'0'] = new TrieNode;
}
p = p ->next[*s-'0'];
s++;
}
p->isStr ++;
return p->isStr;
}
int main() {
int T, n, m, numa = 0, numb = 0,ans;
bool flag = 0;
string s = "";
while(~scanf("%d", &n)) {
root = new TrieNode;
ans = 0;
REP(i, 0, n) {
scanf("%s", str);
m = Insert(str);
ans = max(ans, m);
}
printf("%d\n", ans);
delete root;
}
return 0;
}