View Compilation Error

0_0_31206993_22747.cpp: In lambda function:
0_0_31206993_22747.cpp:135:18: error: 'struct node' has no member named 'i'
         return a.i
                  ^
0_0_31206993_22747.cpp:135:18: error: 'struct node' has no member named 'i'
0_0_31206993_22747.cpp:135:18: error: expected ';' at end of input
0_0_31206993_22747.cpp:135:18: error: expected '}' at end of input
0_0_31206993_22747.cpp: In function 'int main()':
0_0_31206993_22747.cpp:135:18: error: expected ')' at end of input
0_0_31206993_22747.cpp:135:18: error: expected '}' at end of input