res[realIdx] = stack.length ? stack.at(-1) : -1;
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Sport’s famous rivalry began in 1877 and since then 853 men have featured in Australia v England Tests. But who are the very best of the best?
// 原因：先处理右侧元素（含循环部分），把结果存在栈里，供左侧元素直接使用
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