// 核心过滤：弹出栈中「≤当前元素」的数（易错点2：必须是≤，不是<）
'It's our only option'
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Sedaka's popular music faded from the spotlight later in the 1960s, as the British Invasion era took hold of the US.
She was told she would have to have her gallbladder removed, but before she could have the operation, her gallstones caused pancreatitis – an inflammatory disease that can be fatal.
int d = getDigit(arr[i], digit);