$1≤M≤2×10 ^5$
by Fzrcy @ 2022-12-17 10:34:02
线段树要开 $4$ 倍。
by Fzrcy @ 2022-12-17 10:34:55
@[ColinKIA](/user/647306) scanf("%c %lld\n", &ch, &x); 的锅，改成 cin >> ch >> x就过了
by zxh_mc @ 2022-12-17 10:54:39