View Compilation Error

0_0_18539934_13253.cpp: In function 'bool solve()':
0_0_18539934_13253.cpp:69:20: error: too many arguments to function 'int sign(double)'
     if (sign(t1, t2) >= 0) return work1();
                    ^
0_0_18539934_13253.cpp:7:5: note: declared here
 int sign(double x) {
     ^