正经题解｜大天才电话手表

题意分析

用分支语句判断下输入进来的信号值，输出对应的图标即可。

AC代码

#include <iostream>
using namespace std;
int main() {
    int n;
    cin >> n;
    if (n == 4) {
        cout << "####" << endl;
    }else if(n == 3) {
        cout << "###_" << endl;
    }else if(n == 2) {
        cout << "##__" << endl;
    }else if(n == 1) {
        cout << "#___" << endl;
    }else if(n == 0) {
        cout << "____" << endl;
    }
    return 0;
}

复杂度分析

$O(1)$