View Compilation Error

0_0_28999547_935.cpp: In function 'int main()':
0_0_28999547_935.cpp:51:17: error: 'gigh2' was not declared in this scope
                 gigh2 = min(high2, high1);
                 ^
0_0_28999547_935.cpp:52:17: error: 'l' was not declared in this scope
                 l = lower_bound(a + 1, a + 1 + n, low2) - a;
                 ^
0_0_28999547_935.cpp:53:17: error: 'r' was not declared in this scope
                 r = upper_bound(a + 1, a + 1 + n, high2) - a;
                 ^