View Compilation Error

0_0_4857730_6754.cpp: In function `int solve()':
0_0_4857730_6754.cpp:108: error: `l' undeclared (first use this function)
0_0_4857730_6754.cpp:108: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_4857730_6754.cpp: In function `int main()':
0_0_4857730_6754.cpp:147: error: `l' undeclared (first use this function)