View Compilation Error

0_0_38143838_1124.cpp: In function 'll lcm(ll, ll)':
0_0_38143838_1124.cpp:59:20: error: 'gcd' was not declared in this scope
     ll g = gcd(a, b);
                    ^
0_0_38143838_1124.cpp: In function 'int Max_Matrix::max_matrix()':
0_0_38143838_1124.cpp:126:27: error: missing template arguments before '(' token
         u = l = r = vector(n, vector<int>(m));
                           ^
0_0_38143838_1124.cpp: In function 'void Max_Matrix::init(int, int)':
0_0_38143838_1124.cpp:156:20: error: missing template arguments before '(' token
         mp = vector(n, vector<int>(m));
                    ^