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author | jack <[email protected]> | 2024-06-14 13:13:15 -0600 |
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committer | jack <[email protected]> | 2024-06-14 13:13:15 -0600 |
commit | d343a3b18dbaca9297d4f7b2280c4a16f0a5c8aa (patch) | |
tree | 96df922dae2a5073d9a50ea70c7aae6aa37e3ebe /concatenation_binary_num.cpp | |
download | leetcode-d343a3b18dbaca9297d4f7b2280c4a16f0a5c8aa.tar.gz leetcode-d343a3b18dbaca9297d4f7b2280c4a16f0a5c8aa.zip |
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Diffstat (limited to 'concatenation_binary_num.cpp')
-rw-r--r-- | concatenation_binary_num.cpp | 38 |
1 files changed, 38 insertions, 0 deletions
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); +} |