HDU2708 - Vertical Histogram题解

   Write a program to read four lines of upper case (i.e., all CAPITAL LETTERS) text input 
   (no more than 72 characters per line) from the input file and print a vertical 
   histogram that shows how many times each letter (but not blanks, digits, or punctuation) 
   appears in the all-upper-case input. Format your output exactly as shown.

#include <iostream>  
#include <string>  
#include <cstring>  
#include <cctype>  
using namespace std;  
const int MAXN = 26;  
int acount[MAXN];  
  
int main()  
{  
    int linecount, max;  
    string s;  
  
    memset(acount, 0, sizeof(acount));  
  
    linecount = 0;  
    while (getline(cin, s)) {  
        // 统计字母  
        for(int i=0; i<(int)s.size(); i++)  
//            if(isalpha(s[i]))  
//                acount[s[i] - 'A']++;  
            if(isupper(s[i]))  
                acount[s[i] - 'A']++;  
  
        // 每4行输出一次结果  
        if(++linecount == 4) {  
            linecount = 0;  
  
            // 计算最大的统计值  
            max = 0;  
            for(int i=0; i<MAXN; i++)  
                if(acount[i] > max)  
                    max = acount[i];  
  
            // 输出max行  
            for(int i=max; i>0; i--) {  
                for(int j=0; j<MAXN; j++) {  
                    if(acount[j] >= i)  
                        cout << "* ";  
                    else  
                        cout << "  ";  
                }  
                cout << endl;  
            }  
  
            for(int i=0; i<MAXN; i++)  
                cout << (char)('A' + i) << " ";  
            cout << endl;  
        }  
    }  
  
    return 0;  
}