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对撞型指针 while (i < j) { if (height[i] < height[j]) { int h = height[i]; while (i < j && height[i] <= h) { res += h - height[i]; i++; } } else { int h = height[j]; while (i < j && height[j] <= h) { res += h - height[j]; j--; } } }
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