int N = 5;
int M = 6;
int field[5][6] = {0};
int N, M;
cin >> N >> M;
int field[N][M]; -> 표준 C++에서는 안 됨
벡터 생성자
vector<자료형> 이름(개수, 초기값);
vector<int>(M, 0)
M = 5
[0, 0, 0, 0, 0]
위에서 만든 [0,0,0,0,0] 벡터를 N개 만들어라
vector<vector<int>> field(N, vector<int>(M, 0));
N = 3
M = 4
field =
[
[0,0,0,0],
[0,0,0,0],
[0,0,0,0]
]
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