golang map

Posted 2020-09-18 学无止境，每天进步一小步

Our friend Monk has been made teacher for the day today by his school professors . He is going to teach informatics to his colleagues as that is his favorite subject . Before entering the class, Monk realized that he does not remember the names of all his colleagues clearly . He thinks this will cause problems and will not allow him to teach the class well. However, Monk remembers the roll number of all his colleagues very well . Monk now wants you to help him out. He will initially give you a list indicating the name and roll number of all his colleagues. When he enters the class he will give you the roll number of any of his colleagues belonging to the class. You need to revert to him with the name of that colleague.

Input Format

The first line contains a single integers $\mathrm{NN denoting\; the\; number\; of\; Monk‘s\; colleagues.\; Each\; of\; the\; next NN lines\; contains\; an\; integer\; and\; a\; String\; denoting\; the\; roll\; number\; and\; name\; of\; the ii th\; colleague\; of\; Monk.\; The\; next\; Line\; contains\; a\; single\; integer qq denoting\; the\; number\; of\; queries\; Monk\; shall\; present\; to\; you\; when\; he\; starts\; teaching\; in\; class.\; Each\; of\; the\; next qq lines\; contains\; a\; single\; integer xx denoting\; the\; roll\; number\; of\; the\; student\; whose\; name\; Monk\; wants\; to\; know.}$

Output Format

You need to print $\mathrm{qq Strings,\; each\; String\; on\; a\; new\; line,\; indicating\; the\; answers\; to\; each\; of\; Monk‘s\; queries.}$

Constrains

$\mathrm{1\le N\le 1051\le N\le 105}$

$\mathrm{1\le RollNumber\le 1091\le RollNumber\le 109}$

$\mathrm{1\le |Name|\le 251\le |Name|\le 25}$

$\mathrm{1\le q\le 1041\le q\le 104}$

$\mathrm{1\le x\le 1091\le x\le 109}$

Note

The name of each student shall consist of lowercase English alphabets only. It is guaranteed that the roll number appearing in each query shall belong to some student from the class.

其实就是用到了golang 数据集合map，貌似Map的性能不是太好

package main

import "fmt"

func main() {
	//fmt.Println("Hello World!")
	 mapDic := make(map[int]string)
	 
	var mapCount int
	 
	fmt.Scanln(&mapCount)
	var key int
	var value string
	for i:=0;i<mapCount;i++{
	    fmt.Scanln(&key, &value)
	    mapDic[key] = value
	}
	
	var searchCount int
    fmt.Scanln(&searchCount)
    var searchKey int
    for j:=0;j<searchCount;j++{
         fmt.Scanln(&searchKey)
         fmt.Println(mapDic[searchKey])
    }
	
}