P1598 垂直柱状图

题目链接：https://www.luogu.com.cn/problem/P1598
19行就是解题关键
 1 #include <bits/stdc++.h>
 2 using namespace std;
 3 int main() {    
 4     map<char, int> m;
 5     char c;
 6     while (cin >> c) {
 7         if (c >= 'A' && c <= 'Z') { //只统计大写字母
 8             m[c]++;
 9         }
10     }
11     int maxx = -1;
12     for (map<char, int>::iterator it = m.begin(); it != m.end(); it++) {
13         if (it -> second > maxx) {
14             maxx = (it -> second); //取直方图最大高度
15         }
16     }
17     for (int i = 0; i < maxx; i++) { //行数就是直方图的最大高度
18         for (int j = 0; j < 26; j++) { //26列
19             if (i >= maxx - m[j + 'A']) { //确保底在下面
20                 cout << "* ";
21             } else {
22                 cout << "  ";
23             }
24         }
25         cout << endl;
26     }
27     for (map<char, int>::iterator it = m.begin(); it != m.end(); it++) {
28         cout << (it -> first) << " ";
29     }
30     return 0;
31 }