View Compilation Error

0_0_4786812_20932.cpp:5: error: expected `,' or `;' before "int"
0_0_4786812_20932.cpp: In function `void DFS(int)':
0_0_4786812_20932.cpp:34: error: `used' undeclared (first use this function)
0_0_4786812_20932.cpp:34: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4786812_20932.cpp: In function `int main()':
0_0_4786812_20932.cpp:56: error: `used' undeclared (first use this function)