View Compilation Error

0_0_29920307_28929.cpp: In function 'int main()':
0_0_29920307_28929.cpp:37:23: error: 'fro' was not declared in this scope
    j=dui[front],k=dui[fro
                       ^
0_0_29920307_28929.cpp:37:23: error: expected ']' at end of input
0_0_29920307_28929.cpp:37:23: error: expected '}' at end of input
0_0_29920307_28929.cpp:37:23: error: expected '}' at end of input
0_0_29920307_28929.cpp:37:23: error: expected '}' at end of input