View Compilation Error

0_0_11983575_2695.cpp: In function `int main()':
0_0_11983575_2695.cpp:30: error: `min_o' undeclared (first use this function)
0_0_11983575_2695.cpp:30: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11983575_2695.cpp:30: error: `s' undeclared (first use this function)
0_0_11983575_2695.cpp:30: error: `l' undeclared (first use this function)