看不懂的说一下：a_second - a_first为公差
by SIRLRFanco @ 2022-10-03 11:13:00
@[SIRLRFanco](/user/676611)
int 改成 long long，就过了。。。
by Ardoryna @ 2022-10-03 11:31:51
啊这……
by SIRLRFanco @ 2022-10-06 18:32:52
你想想，a1,a2都<=10^6,况且项数也很多，肯定爆。
by Vuglar_zuo @ 2022-12-12 20:45:30