0_0_2877264_31619.cpp: In function `int DFS(int)':
0_0_2877264_31619.cpp:20: error: expected `]' before ')' token
0_0_2877264_31619.cpp: In function `int main()':
0_0_2877264_31619.cpp:44: error: `flag' undeclared (first use this function)
0_0_2877264_31619.cpp:44: error: (Each undeclared identifier is reported only once for each function it appears in.)
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