fix: wrong implementation
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290b6e1d86
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@ -30,8 +30,8 @@ public:
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}
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int sumRegion(int x0, int y0, int x1, int y1) {
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x1--;
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y1--;
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x1++;
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y1++;
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return prefixSum[x1 * n + y1] - prefixSum[x0 * n + y1] - prefixSum[x1 * n + y0] + prefixSum[x0 * n + y0];
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}
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};
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