#include <bits/stdc++.h>

using namespace std;

void print2d(vector<vector<int>> v) {
    for (int r = 0; r < v.size(); r++) {
        for (int c = 0; c < v[0].size(); c++) {
            cout << v[r][c] << " ";
        }
        cout << endl;
    }
}

int main() {
    vector<vector<int>> res {
        { 1, 2, 3 }, 
        { 4, 5, 6 }, 
        { 7, 8, 9 }
    };
    res[0].push_back(10);
    print2d(res);
}

1 2 3 10 

=================================================================
==30==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x6020000000fc at pc 0x0000003783ce bp 0x7ffed76d8410 sp 0x7ffed76d8408
READ of size 4 at 0x6020000000fc thread T0
    #2 0x7fe450bfc0b2  (/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
0x6020000000fc is located 0 bytes to the right of 12-byte region [0x6020000000f0,0x6020000000fc)
allocated by thread T0 here:
    #13 0x7fe450bfc0b2  (/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
Shadow bytes around the buggy address:
  0x0c047fff7fc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c047fff7fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c047fff7fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c047fff7ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c047fff8000: fa fa fd fd fa fa fd fd fa fa fd fd fa fa fd fd
=>0x0c047fff8010: fa fa 00 04 fa fa 00 04 fa fa 00 00 fa fa 00[04]
  0x0c047fff8020: fa fa 00 04 fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8030: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8040: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8050: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c047fff8060: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
  Shadow gap:              cc
==30==ABORTING