密码-题解（C++代码）简单易懂

麻烦大佬看看我这个为啥显示答案错误
#include<iostream>

using namespace std;

int main()
{
	int num;
	cin >> num;
	for (int j = 0; j < num; j++)
	{
		string arr;
		int a = 0, b = 0, c = 0, d = 0;
		int sum = 0;
		cin >> arr;
		int x = arr.length();
		if (x >= 8 && x <= 16)
		{
			for (int i = 0; i < x; i++)
			{
				if (arr[i] >= 48 && arr[i] <= 57)
				{
					a = 1;
				}
				if (arr[i] >= 65 && arr[i] <= 90)
				{
					b = 1;
				}
				if (arr[i] >= 97 && arr[i] <= 122)
				{
					c = 1;
				}
				if (arr[i] == ',' || arr[i] == '!' || arr[i] == '@' || arr[i] == '#' || arr[i] == '$' || arr[i] == '%' || arr[i]=