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441. Arranging Coins
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.gitignore

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.DS_Store
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.DS_Store?
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*.txt
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a.out
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c.c
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IC
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.class

arranging-coins.cpp

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//Runtime: 35 ms
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class Solution {
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public:
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int arrangeCoins(int n) {
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return floor(-0.5 + sqrt((double)2*n+0.25));
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}
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};

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