1791 设备编号 A

 

6.C/c++数字转字符串：

string str = to_string(i);

7.查找字符/字符串

T.find(P,begin) != strting::npos;

代码：

#include <iostream>
using namespace std;

class Solution {
public:
    int GetCountNum(int start, int end) const
    {
        int count = 0;
        for (int i = start; i <= end; i++) {
            string str = to_string(i);
            int begin = -1;
            if (str.find("18", begin + 1) != string::npos || str.find("4", begin + 1) != string::npos) {
                count++;
            }
        }
        return count;
    }
    // 待实现函数，在此函数中填入答题代码;
    int GetNormalDeviceNum(int start, int end) const
    {
        int cnt = GetCountNum(start, end);
        int result = 0;
        result = end - start - cnt + 1;

        return result;
    }
};

// 以下为考题输入输出框架，此部分代码不建议改动
inline int ReadInt()
{
    int number;
    std::cin >> number;
    return number;
}


int main()
{
    int start = ReadInt();
    int end = ReadInt();

    Solution solu;
    int result = solu.GetNormalDeviceNum(start, end);
    cout << result;
    return 0;
}