Some children are playing rope skipping game. Children skip the rope at roughly the same
speed: once per second. If the child fails during the jump, he needs to tidy up the rope and
continue. This will take 3 seconds.
You are given an array failedCount, where each element is the jump count at the failed.
i.e. [12,23,45] means the child failed 3 times in the game process. The 1st mistake occurred when
he jumped 12 times; The 2nd mistake occurred when he jumped 23 times; The 3rd mistake occurred when
he jumped 45 times.
Your task is to calculate how many times the child jumped in 60 seconds.
Note: Each child persisted at least 60 jumps, which meant it could have been over 60 seconds, but the child continued to skip rope.
[input] integer array failedCount
0 ≤ failedCount.length ≤ 60
1 ≤ failedCount[i] ≤ 60
[output] an integer
how many times the child jumped in 60 seconds.
For failedCount = [], the output should be 60.
There is no mistake in the game process. So the child jumped 60 times in 60 seconds.
For failedCount = [12, 23, 45], the output should be 51.
The 1st mistake occurred when he jumped 12 times. --> 12 seconds past.
Tidy up the rope and continue. --> 15 seconds past.
The 2nd mistake occurred when he jumped 23 times. --> 26 seconds past.
Tidy up the rope and continue. --> 29 seconds past.
The 3rd mistake occurred when he jumped 45 times. --> 51 seconds past.
Tidy up the rope and continue. --> 54 seconds past.
When he jumped 51 times --> 60 seconds past.