View Compilation Error

0_0_1212528_23342.cpp: In function `void ring(int*, int, int)':
0_0_1212528_23342.cpp:7: error: `judge' undeclared (first use this function)
0_0_1212528_23342.cpp:7: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_1212528_23342.cpp: In function `int judge(int*, int, int)':
0_0_1212528_23342.cpp:33: error: `int judge(int*, int, int)' used prior to declaration