Напиши рефакторинг кода #Составить программу для нахождения произвольного разбиения 20 студентов на 2 команды, 
#численность которых отличается не более чем в 2 раза, 
#если известно, что в любой команде должны быть студенты, 
#обязательно знакомые друг с другом. 
#Круг знакомств задается матрицей (20,20) с элементами
#A(ij)={1,если i студент знаком с j{0,иначе .

students <- 20
matr=sample(c(0,1), #setting a random matr
            size=students^2,
            prob=c(0.1,0.9),  #probability of occurrence 0 and 1
            replace=T) #with repetitions

team <- function(students,
                 matr=sample(c(0,1),
                             size=students^2,
                             prob=c(0.1,0.9),
                             replace=T)){
  
  # set the vector of students
  
  n <- sample(1:students) # write down the numbers from 1 to 20 in different order
  
  # reshape vector matr into matrix
  
  know <- matrix(matr,
                 nrow=length(n),ncol=length(n)) #the matrix must be symmetrical
  
  for ( i in 1:nrow(know) ){ # for each student i check symmetry and create symmetric matrix
    j <- 1
    while ( j < i ){
      know[i,j] <- know[j,i]
      j <- j+1 #should be 1 on the diagonal since 1 knows 1, 2 knows the second...
    }
    know[i,i] <- 1
  }
  print(know)
  
  # include those who know everyone 
  team_4 <- c() #the students themselves
  r <- c() #student index
  
  for ( i in 1:length(n) ){ # for each student (select his index from vector n)
    e <- 0
    for ( j in 1:length(n) ){ # calculate the number of students he knows
      if ( know[n[i],n[j]] == 1 ){
        e <- e+1 #if the student knows
      }
    }
    if ( e == length(n) ){ # if he knows everyone -> include in team_4
      team_4 <- c(team_4,n[i]) 
      r <- c(r,i) # save the index of student in vector n
    }
  }
  
  if ( length(r) != 0  & length(r) == length(n) ){ # all students know everyone
    
    if ( length(n)%%2 == 0 ){  # split on 2 groups equally if n even 
      team_1 <- c(n[1:(length(n)/2)])
      team_2 <- c(n[(length(n)/2+1):length(n)])
      print(team_1)
      print(team_2)
    }else{ # split by 2 groups 
      team_1 <- c(n[1:(length(n)/2+0.5)])
      team_2 <- c(n[(length(n)/2+1.5):length(n)])
      print(team_1)
      print(team_2)
    }
  }
  
  else{
    if ( length(r) != 0 ){ # if we have students who know everyone 
      n <- n[-r] # drop them from the vector n
    }
    
    # split students into 2 teams
    vector <- n[-1]
    team_1 <- c(n[1]) # put the first student from vector n in group 1 as a starting point
    team_2 <- c()
    l <- c()
    u <- 1
    
    while ( (length(team_1)+length(team_2)) < length(n) ){
      for ( i in 1:length(team_1) ){ # for each student in team_1
        for ( j in 1:length(n) ){ # for students from 1 to 20
          e <- 0
          if ( is.null(team_2) == FALSE ){
            for ( k in 1:length(team_2) ){
              if ( n[j] == team_2[k] ){ # if a student already in team_2 , then e = 1
                e <- 1
              }
            } 
          }
          if ( know[team_1[i],n[j]] == 0 & e == 0 ){ # if student i doesn't know the student j and student j not in team 2 -> put student j in team 2
            team_2 <- c(team_2,n[j])
            if ( length(vector) != 0 ){
              for ( k in 1:length(vector) ){ # for each element of the vector, check if student j is equal to it and drop him out of vector
                if ( vector[k] == n[j] ){
                  vector <- vector[-k]
                  break # stop when first true
                }
              }
            }
          }
        }
      }
      o <- c()
      for ( i in 1:length(team_2) ){ # for each student in team 2
        for ( j in 1:length(n) ){ # for all other students
          e <- 0
          for ( k in 1:length(team_1) ){ # check if a user in team 1
            if ( n[j] == team_1[k] ){
              e <- 1
            }
          }
          if ( know[team_2[i],n[j]] == 0 & e == 0 ){ # if j and i don't know each other -> put j into team_1
            team_1 <- c(team_1,n[j])
            o <- c(o,n[j]) # save the number of this student j in vector o
            if ( length(vector) != 0 ){
              for ( k in 1:length(vector) ){ # drop j from vector
                if ( vector[k] == n[j] ){
                  vector <- vector[-k]
                  break
                }
              }
            }
          }
        }
      }
      l <- c(l,length(team_1)+length(team_2)) # save the length of 2 teams
      if ( u > 1 ){
        if ( l[u] == l[u-1] ){ # if the sizes of the teams in 2 consecutive elements are same
          if ( length(team_1) < length(team_2) ){
            team_2 <- c(team_2,vector[1]) # include the first student from vector to team 2
            vector <- vector[-1]
          }else{
            team_1 <- c(team_1,vector[1]) # else to team 1
            vector <- vector[-1]
          }
        }
      }
      u <- u+1
    }
    #???????? ?? ???????????? ????????
    # double check for relationships of users from team_1
    w <- c()
    if ( length(o) > 0 ){ # o is a vector with students in team1 , who don't know anyone in team 2 and were added in previous step
      for ( i in 1:length(o) ){ # for each such student check whether he knows anyone of 20
        for ( j in 1:length(n) ){
          if ( know[o[i],n[j]] == 0 ){ # if no -> create vector w with all students he doesn't know
            w <- c(w,n[j])
          }
        }
      }
      team_2 <- c(team_2,w) # add these users to team_2
    }
    e <- 0
    for ( i in 1:length(team_1) ){ # if team_1 and team_2 include the same students -> break -> "?????????? ??????? ?? ??? ??????"
      for ( j in 1:length(team_2) ){
        if ( team_1[i] == team_2[j] ){
          e <- 1
          break
        }
      }
      if ( e == 1 ){
        print("Same students in the teams")
        break
      }
    }
    
    if ( e == 0 ){ # if teams are different
      if ( length(o) != 0 ){ # if vector o with students from team 1 is not 0
        team_2 <- team_2[1:(length(team_2)-length(w))] # drop w from team_2
      }
      
      if ( length(team_1) < length(team_2) ){ # if teams are of different sizeand team 1 is smaller change the order of teams 
        team_3 <- team_1
        team_1 <- team_2
        team_2 <- team_3
      }
      if ( length(team_4) == 0 ){ # team_4 includes students, who know everyone. If it is 0 then print the teams
        if ( length(team_1)/length(team_2) <= 2 & length(team_1)/length(team_2) >= 1/2 ){ 
          print(team_1)
          print(team_2)
        }else{
          print(team_1)
          print(team_2)
          print("Everyone doesn't know at least someone: Conditions of task are not satisfied")
        }
      }else{ # if team 4 includes some users
        while ( length(team_4) > 0 & length(team_1) > length(team_2) ){
          team_2 <- c(team_2,team_4[1]) # include members of team 4 into team 2 while conditions are true
          team_4 <- team_4[-1]
        }
        if ( length(team_4) != 0 ){ # if we still have some students in team_4
          while ( length(team_4) > 0 ){
            team_1 <- c(team_1,team_4[1]) # include them in team_1 and team_2 consecutively , start with team 1
            team_4 <- team_4[-1]
            if ( length(team_4) != 0 ){
              team_2 <- c(team_2,team_4[1])
              team_4 <- team_4[-1]
            }
          }
          print(team_1) # print two teams
          print(team_2)
        }else{ # if no students in team_4 -> print teams (again strange part part)
          if ( length(team_1)/length(team_2) <= 2 & length(team_1)/length(team_2) >= 1/2 ){
            print(team_1)
            print(team_2)
          }else{
            print(team_1)
            print(team_2)
            print("At least someone knows everyone: Conditions of task are not satisfied")
          }
        }
      }
    }
  }
}

team(20)
