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题目链接:HDU1540During 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 l...

题意：nnn个数，qqq次操作操作000 xxx yyy把AxA_xAx​修改为yyy操作111 lll rrr询问区间[l,r][l, r][l,r]的最大子段和分析：一个区间[l,r][l,r][l,r]的最大字段和只有444种情况:I.I.I.从包含lll开始的区间(可能右端点到rrr)II.II.II.从包含rrr开始的区间(可能左端点到lll)III.III.III.区间...