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-rw-r--r--other/concatenation_binary_num.cpp38
1 files changed, 38 insertions, 0 deletions
diff --git a/other/concatenation_binary_num.cpp b/other/concatenation_binary_num.cpp
new file mode 100644
index 0000000..b212c09
--- /dev/null
+++ b/other/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);
+}