11104번 Fridge of Your Dreams

https://www.acmicpc.net/problem/11104

2진수를 10진수로 변환하는 문제이다.

문자열로 입력받는다.

#include <iostream>
#include <queue>
#include <stack>
#include <cstdio>
#include <vector>
#include <cstring>
#include <string>
#include <math.h>
#include <algorithm>
#include <map>
#include <set>
#include <sstream>
#include <tuple>
 
#pragma warning(disable:4996)  
#pragma comment(linker, "/STACK:336777216")
 
using namespace std;
 
int main(void)
{
    int n = 0;
 
    scanf("%d", &n);
 
    while (n--)
    {        
        int ans = 0;
 
        string s;
 
        cin >> s;
 
        reverse(s.begin(), s.end());
 
        for (int i = 0; i < s.length(); i++)
            ans += (int)pow((double)2, (double)i) * (s.at(i) - '0');
 
        cout << ans << '\n';
    }
 
    return 0;
}