题解 | #合并表记录#

package main

import (
	"fmt"
	"sort"
)

func main() {
	var n int
	if _, err := fmt.Scan(&n); err != nil {
		fmt.Printf("input n err:%v", err)
		return
	}

	var indexSli = make([]int, n)
	var valueSli = make([]int, n)
	for i := 0; i < n; i++ {
		if _, err := fmt.Scan(&indexSli[i], &valueSli[i]); err != nil {
			fmt.Printf("input index && value err:%v", err)
			return
		}
	}

	var indexMap = make(map[int]int)
	var distinctSli = make([]int, 0)
	for i := 0; i < n; i++ {
		if _, ok := indexMap[indexSli[i]]; ok {
			indexMap[indexSli[i]] += valueSli[i]
		} else {
			indexMap[indexSli[i]] = valueSli[i]
			distinctSli = append(distinctSli, indexSli[i])
		}
	}

	sort.Ints(distinctSli)

	for _, newIndex := range distinctSli {
		fmt.Printf("%d %d\n", newIndex, indexMap[newIndex])
	}
}