Vscode是常用的开发工具，代码插入能够把常见的代码嵌入智能提醒，减轻了很大的工作量，下面是我刷题的配置，直接复制黏贴到自己的cpp.json里就可以用了

左下角，打开设置，选择用户代码片段，选择自己的语言

{
	// Place your snippets for cpp here. Each snippet is defined under a snippet name and has a prefix, body and
	// description. The prefix is what is used to trigger the snippet and the body will be expanded and inserted. Possible variables are:
	// $1, $2 for tab stops, $0 for the final cursor position, and ${1:label}, ${2:another} for placeholders. Placeholders with the
	// same ids are connected.
	// Example:
	// "Print to console": {
	// 	"prefix": "log",
	// 	"body": [
	// 		"console.log('$1');",
	// 		"$2"
	// 	],
	// 	"description": "Log output to console"
	// }
	"inc":{
		"prefix": "inc",
			"body":[
				"#include <bits/stdc++.h>",
				"",
				"using namespace std;",
				"",
				"",
				"",
				"int main()",
				"{",
				"",
				"",
				"    cout << a << endl;",
				"    return 0;",
				"}",
			],
		"description": "头文件和主函数框架"
	},
	"输入长度为n的数组":{
		"prefix": "nnum",
			"body":[
				"int n;",
				"cin >> n;",
				"vector<int> num;",
				"for (int i = 0; i < n; ++i) {",
					"int a;",
					"cin >> a;",
					"num.emplace_back(a);",
				"}",
				"Solution s;",
			],
		"description": "输入长度为n的数组"
	},
	"输入不定长数组":{
		"prefix": "bnuminput",
			"body":[
				"vector<int> arr;",
				"int n = 0;",
				"while (cin >> n) {",
					"arr.emplace_back(n);",
					"if (cin.get() == '\n')  break;// 遇到回车后停止输入",
				"}",
				"Solution s;",
			],
		"description": "输入不定长度的数组,回车停止输入"
	},
	"输入一行字符串":{
		"prefix": "strinput",
			"body":[
				"string inputStr;",
				"getline(cin, inputStr);",
				"Solution s;",
			],
		"description": "输入一行字符串"
	},
	"for循环遍历":{
		"prefix": "fori",
			"body":[
				"for (int i = 0; i < ${1:num.size()}; ++i) {",
				"    ",
				"}",
			],
		"description": "for循环遍历"
	},
	"auto循环遍历":{
		"prefix": "auto",
			"body":[
				"for (const auto& i : ) {",
				"    ",
				"}",
			],
		"description": "auto循环遍历"
	},
	"自定义结构体Node":{
		"prefix": "nodestruct",
			"body":[
				"typedef struct ${1:Node} {",
				"    ${2:int} ${3:a}; ",
				"    ${4:int} ${5:b};",
				"    $1() : $3(0), $5(0) {}",
				"    $1($2 $3, $4 $5) : $3($3), $5($5) {}",
				"} $1;",
			],
		"description": "自定义结构体Node"
	},
	"自定义外部比较函数，sort要加()":{
		"prefix": "cmp",
			"body":[
				"struct cmp {",
				"    bool operator()(const ${1:int}& a, const $1& b)",
				"    {",
				"        return",
				"    }",
				"};",
			],
		"description": "自定义外部比较函数，sort要加()"
	},
	"leetcode核心代码模版":{
		"prefix": "solu",
			"body":[
				"class Solution {",
				"    ${1:int} ${2:Func}(const int& a)",
				"    {",
				"        ",
				"    }",
				"};",
			],
		"description": "leetcode核心代码模版"
	}
}

占位符 $

$ 后面紧跟数字可指定代码片段触发落入编辑器之后的光标位置，光标位置按照从小到大排，光标会默认落到$1 的位置，如果此时没有手动移动光标位置，按 TAB 则光标会落到 $2 的位置，$0 用于设置最终光标的位置，设置了 $0 之后，再往后设置其他占位符则不会生效， $0 终止了 TAB键 的光标跳转操作。

设置默认选项${1:default}

如果要设置占位内容的可选项，写法为 ${1|a,b,c|}，括号中的 1 对应的是按 TAB 之后的光标落点顺序， abc 为可选的项，用逗号隔开。

如果想让代码缩进， 前边加个\t。 同理\n是换行