View Compilation Error

0_0_21369084_25635.cpp: In function 'int main()':
0_0_21369084_25635.cpp:15:18: error: 'a' was not declared in this scope
   puts(k1 >= abs(a - b) and (k1 <= n - a or k2 + n >= a + b) ? "Not lying" : "Lying");
                  ^
0_0_21369084_25635.cpp:15:22: error: 'b' was not declared in this scope
   puts(k1 >= abs(a - b) and (k1 <= n - a or k2 + n >= a + b) ? "Not lying" : "Lying");
                      ^
0_0_21369084_25635.cpp:15:23: error: 'abs' was not declared in this scope
   puts(k1 >= abs(a - b) and (k1 <= n - a or k2 + n >= a + b) ? "Not lying" : "Lying");
                       ^