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

#include <bits/stdc++.h>
using namespace std;
int main() {    
    map<char, int> m;
    char c;
    while (cin >> c) {
        if (c >= 'A' && c <= 'Z') { //只统计大写字母
            m[c]++;
        }
    }
    int maxx = -1;
    for (map<char, int>::iterator it = m.begin(); it != m.end(); it++) {
        if (it -> second > maxx) {
            maxx = (it -> second); //取直方图最大高度
        }
    }
    for (int i = 0; i < maxx; i++) { //行数就是直方图的最大高度
        for (int j = 0; j < 26; j++) { //26列
            if (i >= maxx - m[j + 'A']) { //确保底在下面
                cout << "* ";
            } else {
                cout << "  ";
            }
        }
        cout << endl;
    }
    for (map<char, int>::iterator it = m.begin(); it != m.end(); it++) {
        cout << (it -> first) << " ";
    }
    return 0;
}