View Compilation Error

0_0_14829930_13549.cpp: In function 'int main()':
0_0_14829930_13549.cpp:71:20: error: 'x' was not declared in this scope
                 fa[x] = y;
                    ^
0_0_14829930_13549.cpp:71:25: error: 'y' was not declared in this scope
                 fa[x] = y;
                         ^