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84. 求1+2+…+n
https://www.acwing.com/problem/content/submission/code_detail/14064231/
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AcWing/84/84.cpp
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8
AcWing/84/84.cpp
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@ -0,0 +1,8 @@
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class Solution {
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public:
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int getSum(int n) {
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int r = n;
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n && (r += getSum(n - 1));
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return r;
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}
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};
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