View Compilation Error

0_0_16438801_12491.cpp: In function 'int main()':
0_0_16438801_12491.cpp:32:18: error: expected ',' before '[' token
             if([f[t]].empty())
                  ^
0_0_16438801_12491.cpp:32:18: error: expected identifier before '[' token
0_0_16438801_12491.cpp: In lambda function:
0_0_16438801_12491.cpp:32:22: error: expected '{' before '.' token
             if([f[t]].empty())
                      ^
0_0_16438801_12491.cpp: In function 'int main()':
0_0_16438801_12491.cpp:32:23: error: 'struct main()::<lambda()>' has no member named 'empty'
             if([f[t]].empty())
                       ^