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- #include <iostream>
- #include <vector>
- #include <queue>
- #include <algorithm>
- using namespace std;
- int from_binary_to_decimal(string s) {
- int power_of_two = 1;
- int sum = 0;
- for(int i = s.size() - 1; i >= 0; i--) {
- if(s[i] == '1') {
- sum += power_of_two;
- }
- power_of_two *= 2;
- }
- return sum;
- }
- string from_decimal_to_binary(int x) {
- string s = "";
- while(x > 0) {
- s += (x % 2) + '0';
- x /= 2;
- }
- reverse(s.begin(), s.end());
- return s;
- }
- int main()
- {
- ios_base::sync_with_stdio(false);
- cout.tie(0);
- cin.tie(0);
- cout << from_binary_to_decimal("101") << " " << from_binary_to_decimal("1") << endl;
- cout << from_decimal_to_binary(5) << endl;
- return 0;
- }
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