Add 14623.cpp

14xxx/14623.cpp

@@ -0,0 +1,30 @@
+#include <iostream>
+#include <string>
+using namespace std;
+
+long long bin2dec(string b) {
+  long long ret = 0;
+  for (char c : b) ret = 2 * ret + (c - '0');
+  return ret;
+}
+
+string dec2bin(long long d) {
+  string ret = "";
+  while (d > 0) ret = to_string(d & 1) + ret, d >>= 1;
+  return ret;
+}
+
+void solve(void) {
+  string b1; cin >> b1;
+  string b2; cin >> b2;
+
+  cout << dec2bin(bin2dec(b1) * bin2dec(b2));
+}
+
+int main(void) {
+  ios::sync_with_stdio(false);
+  cin.tie(nullptr);
+
+  solve();
+  return 0;
+}