Baseball Game

Baseball Game.go

func calPoints(ops []string) int {
    keyStack := make([]int, 0, len(ops))
    
    for i:= range ops{
        switch(ops[i]) {
            case "+" :
                r1 := keyStack[len(keyStack)-1]
                r2 := keyStack[len(keyStack)-2]
                keyStack = append(keyStack, r1+r2)
            case "D":
                r1 := keyStack[len(keyStack)-1]
                keyStack = append(keyStack , 2* r1)
            case "C":
                keyStack = keyStack[:len(keyStack)-1]
        
            default:
            point , _:= strconv.Atoi(ops[i])
            keyStack = append(keyStack, point)
        }
    }
    
    result := 0 
    for _, p := range keyStack {
        result += p
    }
    return result
}