View Compilation Error

0_0_32942249_7688.cpp: In function 'void update(int, int)':
0_0_32942249_7688.cpp:33:7: error: 'sum' was not declared in this scope
       sum[N+L]=C;
       ^
0_0_32942249_7688.cpp:33:13: error: 'L' was not declared in this scope
       sum[N+L]=C;
             ^
0_0_32942249_7688.cpp:33:16: error: 'C' was not declared in this scope
       sum[N+L]=C;
                ^