View Compilation Error

0_0_29542218_29797.cpp: In lambda function:
0_0_29542218_29797.cpp:28:16: error: expected '{' before '.' token
       if(u>=[i].b)
                ^
0_0_29542218_29797.cpp: In function 'int main()':
0_0_29542218_29797.cpp:28:17: error: 'struct main()::<lambda()>' has no member named 'b'
       if(u>=[i].b)
                 ^