View Compilation Error

0_0_15174869_17164.cpp: In function 'void update(int, int, int)':
0_0_15174869_17164.cpp:10:25: error: 'N' was not declared in this scope
     for(int x = i; x <= N; x += lowbit(x))
                         ^
0_0_15174869_17164.cpp:12:13: error: 'C' was not declared in this scope
             C[x][y] += delta;
             ^
0_0_15174869_17164.cpp: In function 'int getsum(int, int)':
0_0_15174869_17164.cpp:19:23: error: 'C' was not declared in this scope
             result += C[x][y];
                       ^