View Compilation Error

0_0_6040506_20714.cpp:4: error: `constint' does not name a type
0_0_6040506_20714.cpp: In function `bool judge(int, int)':
0_0_6040506_20714.cpp:16: error: `returntrue' undeclared (first use this function)
0_0_6040506_20714.cpp:16: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_6040506_20714.cpp:17: error: `elsereturnfalse' undeclared (first use this function)
0_0_6040506_20714.cpp: In function `long long int DFS(int, int)':
0_0_6040506_20714.cpp:47: error: `return1' undeclared (first use this function)
0_0_6040506_20714.cpp: In function `int main()':
0_0_6040506_20714.cpp:68: error: `inf' undeclared (first use this function)
0_0_6040506_20714.cpp:74: error: `return0' undeclared (first use this function)