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frog
- 青蛙换位问题,左边的青蛙和右边的青蛙要面对面跳跃,墩子数比青蛙数多1,左边右边交换位置了代表成功-Frog problem of transposition, the frog on the left and right sides of the frog to jump face to face baidunzi than frog a few more than a left right swap positions on behalf of successful