hdu1004Let the Balloon Rise

Problem Description

Contest time again! How excited it is to see balloons floating around. But to tell you a secret, the judges' favorite time is guessing the most popular problem. When the contest is over, they will count the balloons of each color and find the result.
This year, they decide to leave this lovely job to you.

 

Input

Input contains multiple test cases. Each test case starts with a number N (0 < N <= 1000) -- the total number of balloons distributed. The next N lines contain one color each. The color of a balloon is a string of up to 15 lower-case letters.
A test case with N = 0 terminates the input and this test case is not to be processed.

 

Output

For each case, print the color of balloon for the most popular problem on a single line. It is guaranteed that there is a unique solution for each test case.

 

Sample Input

5 green red blue red red 3 pink orange pink 0

 

Sample Output

red pink

 

Author

WU, Jiazhi

 

Source

ZJCPC2004

#include<iostream>
#include<cstring>
#include<cstdio>
#include<cmath>

using namespace std;

struct node
{
    node* next[26];
    bool end;
    int num;
    node()
    {
        for(int i = 0;i<26;i++)
            next[i] = NULL;
        end = 0;
        num = 0;
    }
};
node* root;
char s[100],ma[100];
int mx;
int insert()
{
    int l =strlen(s);
    node* k = root;
    int i,j;
    for(i = 0;i<l-1;i++)
    {
        int id = s[i]-'a';
        if(k->next[id] == NULL)
        {
            node* t = new node();
            k->next[id] = t;
            k = k->next[id];
        }
        else
        {
            k = k->next[id];
        }
    }
    int id = s[i]-'a';
    if(k->next[id] == NULL)
    {
        node* t = new node();
        t->end = 1,t->num = 1;
        k->next[id] = t;
        k = k->next[id];
    }
    else
    {
        k = k->next[id];
        k->num++;
    }
    return k->num;
}

int main()
{
    int n,i,j,k;
    while(cin>>n,n)
    {
        root = new node();
        mx = 0;
        for(i = 0;i<n;i++)
        {
            cin>>s;
            int t = insert();
            if(mx<t)
            {
                mx = t;
                int l = strlen(s);
                for(j = 0;j<=l;j++)
                    ma[j] = s[j];
            }
        }
        cout<<ma<<endl;
    }
    return 0;

}