From d343a3b18dbaca9297d4f7b2280c4a16f0a5c8aa Mon Sep 17 00:00:00 2001 From: jack <0x6A73@pm.me> Date: Fri, 14 Jun 2024 13:13:15 -0600 Subject: initial --- concatenation_binary_num.cpp | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 concatenation_binary_num.cpp (limited to 'concatenation_binary_num.cpp') diff --git a/concatenation_binary_num.cpp b/concatenation_binary_num.cpp new file mode 100644 index 0000000..b212c09 --- /dev/null +++ b/concatenation_binary_num.cpp @@ -0,0 +1,38 @@ +#include "leetcode.h" + +class Solution { +public: + int concatenatedBinary(int n) { + string s = decimalToBinary(n); + return binaryToDecimal(s); + } + +private: + int mod = 1000000007; + string decimalToBinary(int n) { + string str = ""; + for (int i = n; i >= 1; --i) { + int j = i; + while (j) { + str += (j % 2) + '0'; + j /= 2; + } + } + return str; + } + int binaryToDecimal(string n) { + long long ans = 0, p = 1; + for (int i = 0; i < n.size(); ++i) { + long long curr = (n[i] - '0') * p; + p *= 2; + p %= mod; + ans += curr; + } + return ans % mod; + } +}; + +int main() { + Solution obj; + cout << obj.concatenatedBinary(3); +} -- cgit v1.2.3