View Compilation Error

0_0_36054758_27760.cpp: In constructor 'matrix::matrix()':
0_0_36054758_27760.cpp:16:24: error: 'reset' was not declared in this scope
     matrix() {reset(m,0);}
                        ^
0_0_36054758_27760.cpp: In function 'void solve()':
0_0_36054758_27760.cpp:92:17: error: 'reset' was not declared in this scope
     reset(lazy,0);
                 ^