근 ¶
1 고.
1 ¶
~cpp
def toInt(aList): return [{'O':1,'X':0}[v] for v in aList]
def ox(aList):
for idx in range(1,len(aList)):
aList[idx]=aList[idx]*(aList[idx-1]+1)
return sum(aList)
2 ¶
input . 그 .
각 sub "O" 갯 고 각 f(n) = f(n-1)+1 계 겠 각.
f(n) sum(f(n)) = n(n+1)/2 , 각 . 결국 결.
----
if e!='' , len(e) 0 그 . "" "" .
J .
--JuNe
f(n) sum(f(n)) = n(n+1)/2 , 각 . 결국 결.
~cpp
def ox(aList): return sum((len(e)*(len(e)+1))/2 for e in aList.split("X") if e!='')
for each in ['OOXXOXXOOO','OOXXOOXXOO', 'OXOXOXOXOXOXOX', 'OOOOOOOOOO','OOOOXOOOOXOOOOX']: print ox(each)
[:+/[:-:@(#*1+#);._1 'X',]
