pitot

Your mission

Find the first airspeed reading that falls away from the one before it.

today's brief

June 1, 2009. Air France 447 is over the Atlantic at night when its pitot tubes ice over and the airspeed readings collapse inside a second. The autopilot handed the aircraft back to the crew with no reliable speed to fly by, at 35000 feet, in weather. All 228 people on board died. The tubes were a known problem and were already being swapped out across the fleet. Find the moment the reading falls away.

See it in action

first_dropout({275,274,60,61}, 4, 30)

Expected result

Your checklist

For your own tracking. Tests grade your code.

speed holds n readings, in the order they were recorded.
Return the index of the first reading that sits more than limit below the reading just before it.
A reading that goes up is never a drop, however big the jump.
Return -1 when no reading falls that far.

More examples

first_dropout({275,270,265}, 3, 30)

Expected result

-1

first_dropout({275}, 1, 30)

Expected result

-1

Constraints

Expected files

pitot.c

Allowed functions

None. Write every helper yourself.

Back to compete

Solutions

pitot

Your mission

Find the first airspeed reading that falls away from the one before it.

today's brief

See it in action

first_dropout({275,274,60,61}, 4, 30)

Expected result

Your checklist

For your own tracking. Tests grade your code.

speed holds n readings, in the order they were recorded.
Return the index of the first reading that sits more than limit below the reading just before it.
A reading that goes up is never a drop, however big the jump.
Return -1 when no reading falls that far.

More examples

first_dropout({275,270,265}, 3, 30)

Expected result

-1

first_dropout({275}, 1, 30)

Expected result

-1

Constraints

Expected files

pitot.c

Allowed functions

None. Write every helper yourself.

Back to compete

Solutions