787. Cheapest Flights Within K Stops — Bellman-Ford k+1 relaxations.

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787. Cheapest Flights Within K Stops — Bellman-Ford k+1 relaxations.
@param {number} n
@param {number[][]} flights [from,to,price]
@param {number} src
@param {number} dst
@param {number} k
@returns {number}