let steps = 8
let path = 'DDUUDDUDUUUD'

function countingValleys(steps, path) {
    let seaLevel = 0
    let valleys = 0
    let inValley = false
    let stopCount = false
    
    for (let i = 0; i < path.length; i += 1) {
      const step = path[i]
      
      if (step === 'U') {
        seaLevel += 1
        if(seaLevel >= 0) {
          inValley = false
          stopCount = false
        }
      } else if (step === 'D') {
        seaLevel -= 1
        if(seaLevel < 0) {
          inValley = true
        }
      }
      if (inValley && !stopCount) {
        valleys += 1        
        stopCount = true
      }
    }
  return valleys
}


console.log(countingValleys(steps, path))