Description
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 J
阅读背景：
hdu 1540 Tunnel Warfare （线段树，维护当前最大连续区间）
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