View Compilation Error

0_0_1549057_15799.cpp: In function `int col(int, int)':
0_0_1549057_15799.cpp:62: error: return-statement with no value, in function returning 'int'
0_0_1549057_15799.cpp: In function `int ans(int, int)':
0_0_1549057_15799.cpp:71: error: `m' undeclared (first use this function)
0_0_1549057_15799.cpp:71: error: (Each undeclared identifier is reported only once for each function it appears in.)