View Compilation Error

0_0_30479127_4508.cpp: In function 'void pushup(long long int)':
0_0_30479127_4508.cpp:37:24: error: 'r' was not declared in this scope
  c[o]=max(c[lson(o)],c[r
                        ^
0_0_30479127_4508.cpp:37:24: error: expected ']' at end of input
0_0_30479127_4508.cpp:37:24: error: expected '}' at end of input