count - Counting activity within a time period in R -


i have data set each data point question answered in math program.

a sample data set be

user_id  correct         time 5409        0     2016-03-09 10:58:53 5409        1     2016-02-16 09:50:42 5409        0     2016-01-28 09:46:43 5409        1     2016-03-09 10:58:32

i count number of questions answered per day , have count of how many answered correct , how many answered wrong.

i have tried use function count in r:

df$time <- as.posixct(strftime(oneuser$time, format='%y/%m/%d'),format='%y/%m/%d',tz="cet") count(df, user_id, time ,correct)

which give following result: 

    user_id      time      correct   n  1   540952   2015-08-13       0    11  2   540952   2015-08-13       1    39  3   540952   2015-08-17       0     6  4   540952   2015-08-17       1    12  5   540952   2015-08-20       0    25  6   540952   2015-08-20       1    58  7   540952   2015-08-27       0    11

but rearrange have total number of question answered, number of questions answered correctly , number of questions answered wrong in columns next each other e.g. 

user_id      time      correct    wrong     total   540952   2015-08-13      39        11       50  540952   2015-08-17      12        6        18


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