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authorjack <[email protected]>2024-06-14 13:13:15 -0600
committerjack <[email protected]>2024-06-14 13:13:15 -0600
commitd343a3b18dbaca9297d4f7b2280c4a16f0a5c8aa (patch)
tree96df922dae2a5073d9a50ea70c7aae6aa37e3ebe /concatenation_binary_num.cpp
downloadleetcode-d343a3b18dbaca9297d4f7b2280c4a16f0a5c8aa.tar.gz
leetcode-d343a3b18dbaca9297d4f7b2280c4a16f0a5c8aa.zip
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Diffstat (limited to 'concatenation_binary_num.cpp')
-rw-r--r--concatenation_binary_num.cpp38
1 files changed, 38 insertions, 0 deletions
diff --git a/concatenation_binary_num.cpp b/concatenation_binary_num.cpp
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+++ b/concatenation_binary_num.cpp
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+#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);
+}