View Compilation Error

0_0_14252919_27622.cpp: In function 'void init()':
0_0_14252919_27622.cpp:34:25: error: 'n' was not declared in this scope
     for (int i = 0; i < n; i++) 
                         ^
0_0_14252919_27622.cpp:37:25: error: 'n' was not declared in this scope
     for (int i = 0; i < n; i++)
                         ^
0_0_14252919_27622.cpp:41:28: error: 'a' was not declared in this scope
     while (scanf ("%d%d", &a, &b) && (a||b) ){
                            ^
0_0_14252919_27622.cpp:41:32: error: 'b' was not declared in this scope
     while (scanf ("%d%d", &a, &b) && (a||b) ){
                                ^