题解 | #合并表记录#

package main

import (
    "fmt"
    "sort"
)

func calculateSum(nums [][2]int) {
    m := make(map[int]int, 0)

    for _, pair := range nums {
        m[pair[0]] += pair[1]
    }

    var keyList []int
    for key, _ := range m {
        keyList = append(keyList, key)
    }

    sort.Ints(keyList)

    for _, key := range keyList {
        fmt.Printf("%d %d\n", key, m[key])
    }
}

func main() {
    var N int
    var nums [][2]int

    fmt.Scan(&N)

    for i:=0; i<N; i++ {
        var a, b int
        fmt.Scan(&a, &b)
        nums = append(nums, [2]int{a, b})
    }

    calculateSum(nums)
}

// 本题输入为数字，所以采用 fmt.Scan(&a, &b) 的方式接受输入