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View Compilation Error

0_0_39141114_8048.cpp: In function 'int DFS(int)':
0_0_39141114_8048.cpp:13:23: error: 'i' was not declared in this scope
   13 |     if (is_valid(row, i)) {
      |                       ^
0_0_39141114_8048.cpp:13:9: error: 'is_valid' was not declared in this scope
   13 |     if (is_valid(row, i)) {
      |         ^~~~~~~~


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