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s=path
level1=level2=valley=0
for i in range(len(s)):
if s[i]=='U':
level1+=1
else:
level2+=1
if level2-level1==0:
if s[i]=='U':
valley+=1
return valley
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Counting Valleys
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s=path level1=level2=valley=0 for i in range(len(s)): if s[i]=='U': level1+=1 else: level2+=1 if level2-level1==0: if s[i]=='U': valley+=1 return valley