CCPC网络赛，HDU_5842 Lweb and String

Problem Description

Lweb has a string $S$.

Oneday, he decided to transform this string to a new sequence.

You need help him determine this transformation to get a sequence which has the longest LIS(Strictly Increasing).

You need transform every letter in this string to a new number.

$A$ is the set of letters of $S$, $B$ is the set of natural numbers.

Every injection $f: A \rightarrow B$ can be treat as an legal transformation.

For example, a String “aabc”, $A = \{ a,b,c \}$, and you can transform it to “1 1 2 3”, and the LIS of the new sequence is 3.

Now help Lweb, find the longest LIS which you can obtain from $S$.

LIS: Longest Increasing Subsequence. (https://en.wikipedia.org/wiki/Longest_increasing_subsequence)

 

Input

The first line of the input contains the only integer $T, (1 \leq T \leq 20)$.

Then $T$ lines follow, the i-th line contains a string $S$ only containing the lowercase letters, the length of $S$ will not exceed $10^5$.

 

Output

For each test case, output a single line "Case #x: y", where x is the case number, starting from 1. And y is the answer.

 

 

Sample Input

2

aabcc

acdeaa

 

Sample Output

Case #1: 3

Case #2: 4

代码如下：

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

using namespace std;

char s[100010];
int w[26];

int main()
{
    int t;
    int d = 0;
    int sum;
    scanf("%d",&t);
    while(t--)
    {
        sum = 0;
        scanf("%s",&s);
        memset(w,0,sizeof(w));
        for (int i=0;i<strlen(s);i++)
        {
            if (w[s[i]-'a'] == 0){
                sum++;
                w[s[i]-'a'] = 1;
            }else
            continue;
        }
        printf("Case #%d: %d\n",++d,sum);
    }
    return 0;
}

思路解析：

             这题就是题意的问题。A不出来都是被样例迷惑了！样例毁一生2333333，有时候理解真的比直接敲更有用。