add new solutions

solutions/0/q57/solution.go

@@ -0,0 +1,30 @@
+package q57
+
+func insert(intervals [][]int, newInterval []int) [][]int {
+	ret := make([][]int, 0, len(intervals)+1)
+
+	i := 0
+	for ; i < len(intervals) && intervals[i][0] <= newInterval[0]; i++ {
+		ret = append(ret, intervals[i])
+	}
+
+	if len(ret) > 0 && ret[len(ret)-1][1] >= newInterval[0] {
+		ret[len(ret)-1][1] = max(ret[len(ret)-1][1], newInterval[1])
+	} else {
+		ret = append(ret, newInterval)
+	}
+
+	for ; i < len(intervals); i++ {
+		last := ret[len(ret)-1]
+		next := intervals[i]
+		if last[1] >= next[0] {
+			last[1] = max(last[1], next[1])
+		} else {
+			ret = append(ret, next)
+		}
+	}
+
+	return ret
+}
+
+var _ = insert