During the War of Resistance Against Japan, tunnel warfare was carried out extensively in the vast areas of north China Plain. Generally speaking, villages connected by tunnels lay in a line. Except the two at the ends, every village was directly connected with two neighboring ones.During the War of Resistance Against Japan,
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Tunnel Warfare HDU - 1540 （线段树处理连续区间问题）_weixin_30387663的博客
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