我最近开始学习C++，使用Visual Studio Code，在用std::vector声明一个2D矩阵的时候，我开始调用一个Python non-aggregate type 'vector<vector<int> >' cannot be initialized with an initializer list，我上网看别人是怎么解决这个问题的，他们说这种错误在使用C11以前的C版本时经常出现，并按照给出的指示指示VisualStudio代码在编译程序时使用参数-std=c++11。然而，这并没有改变任何事情，我现在不知道如何修复这个错误。
代码：

#include <cmath>
#include <iostream>
#include <string>
#include <vector>
using namespace std;

vector<vector<int> > board = {
    {0,0,3, 0,9,2, 0,0,0},
    {4,0,0, 0,3,0, 0,1,0},
    {2,7,0, 0,0,0, 0,0,0},

    {0,1,0, 3,0,0, 0,0,8},
    {0,5,0, 1,6,7, 0,3,0},
    {3,0,0, 0,0,8, 0,6,0},

    {0,0,0, 0,0,0, 0,5,3},
    {0,3,0, 0,8,0 ,0,0,9},
    {0,0,0, 6,2,0, 1,0,0}
};

vector<vector<int> > get_square(int x, int y, vector<vector<int> > grid) {
    int norm_x = floor(x / 3) * 3;
    int norm_y = floor(y / 3) * 3;
    vector<vector<int> > square = {};
    for (int i = 0; i < 3; i++) {
        for (int j = 0; j < 3; j++) {
            square[i][j] = grid[i][j];
        }
    }
    
    return square;
};

int main() {
    int test1[2][2] = {
        {1,2},
        {3,4}
    };
    int test2[2][2] = {
        {0,0},
        {0,0}
    };
    
    for (int i = 0; i < 2; i++) {
        for (int j = 0; j < 2; j++) {
            test2[i][j] = test1[i][j];
        }
    }
    
    test2[0][0] = 0;
    cout << test1 << "\n";
    cout << test2 << "\n";
    vector<vector<int> > result;
    result = get_square(1,1,board);
    for (int i = 0; i < 3; i++) {
        for (int j = 0; j < 3; j++) {
            cout << result[i][j] << ' ';
        }
        cout << "\n";
    }
    return 0;
};

设置. json（code-runner.executorMap）：

"code-runner.executorMap": {

    
        "javascript": "node",
        "java": "cd $dir && javac $fileName && java $fileNameWithoutExt",
        "c": "cd $dir && gcc $fileName -o $fileNameWithoutExt && $dir$fileNameWithoutExt",
        "cpp": "cd $dir && g++ -std=c++11 $fileName -o $fileNameWithoutExt && $dir$fileNameWithoutExt",
        "objective-c": "cd $dir && gcc -framework Cocoa $fileName -o $fileNameWithoutExt && $dir$fileNameWithoutExt",
        "php": "php",
        "python": "python -u",
        "perl": "perl",
        "perl6": "perl6",
        "ruby": "ruby",
        "go": "go run",
        "lua": "lua",
        "groovy": "groovy",
        "powershell": "powershell -ExecutionPolicy ByPass -File",
        "bat": "cmd /c",
        "shellscript": "bash",
        "fsharp": "fsi",
        "csharp": "scriptcs",
        "vbscript": "cscript //Nologo",
        "typescript": "ts-node",
        "coffeescript": "coffee",
        "scala": "scala",
        "swift": "swift",
        "julia": "julia",
        "crystal": "crystal",
        "ocaml": "ocaml",
        "r": "Rscript",
        "applescript": "osascript",
        "clojure": "lein exec",
        "haxe": "haxe --cwd $dirWithoutTrailingSlash --run $fileNameWithoutExt",
        "rust": "cd $dir && rustc $fileName && $dir$fileNameWithoutExt",
        "racket": "racket",
        "scheme": "csi -script",
        "ahk": "autohotkey",
        "autoit": "autoit3",
        "dart": "dart",
        "pascal": "cd $dir && fpc $fileName && $dir$fileNameWithoutExt",
        "d": "cd $dir && dmd $fileName && $dir$fileNameWithoutExt",
        "haskell": "runhaskell",
        "nim": "nim compile --verbosity:0 --hints:off --run",
        "lisp": "sbcl --script",
        "kit": "kitc --run",
        "v": "v run",
        "sass": "sass --style expanded",
        "scss": "scss --style expanded",
        "less": "cd $dir && lessc $fileName $fileNameWithoutExt.css",
        "FortranFreeForm": "cd $dir && gfortran $fileName -o $fileNameWithoutExt && $dir$fileNameWithoutExt",
        "fortran-modern": "cd $dir && gfortran $fileName -o $fileNameWithoutExt && $dir$fileNameWithoutExt",
        "fortran_fixed-form": "cd $dir && gfortran $fileName -o $fileNameWithoutExt && $dir$fileNameWithoutExt",
        "fortran": "cd $dir && gfortran $fileName -o $fileNameWithoutExt && $dir$fileNameWithoutExt"
    },

终端错误输出：

Build finished with errors(s):
path/to/file/sudoku.cpp:7:22: error: non-aggregate type 'vector<vector<int> >' cannot be initialized with an initializer list
vector<vector<int> > board = {
                     ^       ~
path/to/file/sudoku.cpp:24:26: error: non-aggregate type 'vector<vector<int> >' cannot be initialized with an initializer list
    vector<vector<int> > square = {};
                         ^        ~~
2 errors generated.

The terminal process failed to launch (exit code: -1).

如果答案能为解决方案提供一个清晰的解释，我将不胜感激，因为我对C++没有太多的经验。