/
duplicates.go
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/
duplicates.go
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// Copyright (c) 2019 Matúš Mrekaj.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package arrays
// DeleteDuplicates deletes duplicate elements
// and returns the number of valid elements left
// in the slice.
// The time complexity is O(N), and the space complexity
// is O(1).
func DeleteDuplicates(x []int) int {
if len(x) == 0 {
return 0
}
last := 0
for current := 1; current < len(x); current++ {
if x[current] != x[last] {
last++
x[last] = x[current]
}
}
return last + 1
}