View Compilation Error

122692_0_25547.c:4: error: syntax error before "tu"
122692_0_25547.c: In function `dfs':
122692_0_25547.c:13: error: `bool' undeclared (first use in this function)
122692_0_25547.c:13: error: (Each undeclared identifier is reported only once
122692_0_25547.c:13: error: for each function it appears in.)
122692_0_25547.c:13: error: syntax error before "hash"
122692_0_25547.c: At top level:
122692_0_25547.c:18: error: variable-size type declared outside of any function
122692_0_25547.c:18: error: variable-sized object may not be initialized
122692_0_25547.c:19: error: syntax error before '}' token