View Compilation Error

0_0_37650088_27740.cpp: In function 'int getsum(int)':
0_0_37650088_27740.cpp:31:16: error: 'i' was not declared in this scope
         sum+=c[i];
                ^
0_0_37650088_27740.cpp: In function 'void update(int, int)':
0_0_37650088_27740.cpp:40:11: error: 'i' was not declared in this scope
         c[i]+=v;
           ^