View Compilation Error

0_0_32942255_9947.cpp: In function 'void update(int, int)':
0_0_32942255_9947.cpp:33:10: error: 'sum' was not declared in this scope
          sum[N+L]=C;
          ^
0_0_32942255_9947.cpp:33:16: error: 'L' was not declared in this scope
          sum[N+L]=C;
                ^
0_0_32942255_9947.cpp:33:19: error: 'C' was not declared in this scope
          sum[N+L]=C;
                   ^