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#include <bits/stdc++.h>
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using namespace std;
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//思路：
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//(1)倒推
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//(2)用实例总结通项公式
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int main() {
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//第十天 1
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//第九天 1*2+2=4
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//第八天 4*2+2=10
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//第七天 10*2+2=22
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//第六天 22*2+2=46
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int sum = 1;
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for (int i = 2; i <= 10; i++) {
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sum = sum * 2 + 2;
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}
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cout << sum << endl;
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return 0;
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}
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