Tinkoff Internship Warmup Round 2018 and Codeforces Round #475 (Div. 2) C.Alternating Sum 题意+解析+ 答案
C.AlternatingSumtimelimitpertest1secondmemorylimitpertest256megabytesinputstandardinputoutputstandardoutputYouaregiventwointegersaaandbb.Moreover,youaregivenasequences0,s1,…,sns0,s1,…,sn.Allvaluesinss