// 1-base数组cerr输出
template<typename T> void print_2d_debug(vector<vector<T>> &a)
{
int n = a.size() - 1;
int m = a[0].size() - 1;
for (int i = 1; i <= n; i ++ )
{
for (int j = 1; j <= m; j ++ )
{
cerr << a[i][j] << ' ';
}
cerr << '\n';
}
}
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