771. Jewels and Stones
// 771. Jewels and Stones -1 (for *2)
func numJewelsInStones(_ jewels: String, _ stones: String) -> Int {
var result = 0
for i in stones {
for j in jewels {
if String(j) == String(i) {
result += 1
}
}
}
return result
}
for loop 두 개 중첩...
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