View Compilation Error

0_0_20850731_8992.cpp: In function 'int main()':
0_0_20850731_8992.cpp:62:35: error: 'l1n' was not declared in this scope
     if (sum[0] + t1[0] > t || sum[l1n - 1] + t1[m - 1] < t)
                                   ^