19 lines
446 B
C++
19 lines
446 B
C++
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#include<bits/stdc++.h>
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using namespace std;
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int a[31], i = 0, j;
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long long s = 0;
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int main() {
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//录入进来，终止条件是CTRL+D，最起码在CLion里是这样的
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while (cin >> a[i++]);
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//一次性和
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for (j = 0; j < i; j++) {
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s += a[j];
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}
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//规律~
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s *= pow(2, i - 2);//注意，i-2! 之所有是i-2，是因为你已经使用过一次，本来是i-1
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cout << s;
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return 0;
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}
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