stack.pop(); // 弹出无效候选值
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在吉林，强调“要以发展现代化大农业为主攻方向”，统筹发展科技农业、绿色农业、质量农业、品牌农业；
1. 找出最大值max和最小值min
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So on paper at least, there is room for improvement. However, Jackson says there are doubts over the true size of Venezuela's oil reserves.
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