Golang is strange

I don't like these syntax - so weird. Performing the operations to array/stack/queue is so unfriendly.

func longestValidParentheses(s string) int {
    var ans = 0
    var st = []int {-1}
    for i, c := range s {
        if c == '(' {
            st = append(st, i)
            continue
        }
        st = st[:len(st)-1]
        if len(st) == 0 {
            st = append(st, i)
        } else {
            var t = i - st[len(st)-1]
            if t > ans {
                ans = t
            }
        }
    }
    return ans
}

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