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class Solution { public: bool judgeSquareSum(int c) { int sqr = (int) sqrt(1.0 * c); for (int i = sqr; i > sqr / 2; --i) { int j = (int) sqrt(1.0 * c - i * i); if (j * j + i * i == c) { return 1; } } return 0; } };

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