题干

C++实现

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<map>
using namespace std;

int main() {
	//如果输入带空格的字符串（scanf不行）？eg:This is An Pencil Case
	//1.fgets()
	//2.cin.getline();
	char arr[200] = { 0 };
	fgets(arr, 200, stdin);

	int i = 0;
	int alphaCount = 0;
	bool isSpace = true;//标志前一个字符是否是空格
	int wordCount = 0;	

	map<char, int> alphaMap;
	while (true) {
		if (arr[i] == '\0' || arr[i] == '\n') {
			break;
		}
		else if (arr[i] == ' ') {
			isSpace = true;
		}
		else {
			++alphaCount;
			if (isSpace) {
				wordCount++;
			}
			if (arr[i] >= 'A' && arr[i] <= 'Z') {
				arr[i] += 32;//大写字母变小写字母
			}
			++alphaMap[arr[i]];	
			isSpace = false;
		}
		i++;
	}

	printf("%d\n", alphaCount);
	printf("%d\n", wordCount);


	map<char, int>::iterator it;
	int maxTimes = 0;
	for (it = alphaMap.begin(); it != alphaMap.end(); it++)
	{
		if (it->second > maxTimes) {
			maxTimes = it->second;
		}
	}

	for (it = alphaMap.begin(); it != alphaMap.end(); it++)
	{
		if (it->second == maxTimes) {
			printf("%c ", it->first);
		}
	}
	printf("\n");
	printf("%d\n",maxTimes);
	return 0;
}