require(reshape2)x = data.frame(subject = c("John", "Mary"), time = c(1,1), age = c(33,NA), weight = c(90, NA), height = c(2,2))x subject time age weight height1 John
一开始出了点bug能看见排行榜,于是我看见我半个小时就A掉了前两题,信心场QAQ T1字符串题就不说了qwq #include<iostream> #include<cstring> #include<cstdlib> #include<cstdio> #include<algorithm> #define ll long long using namespace std; ,inf=1e9; int n,m,x,y,z,tot; char c;