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0_0_38896294_11964.cpp: In function 'Matrix mat_mul(Matrix, Matrix, int)':
0_0_38896294_11964.cpp:51:9: error: 'memset' was not declared in this scope
   51 |         memset(ans.mat, 0, sizeof(ans.mat));
      |         ^~~~~~
0_0_38896294_11964.cpp:2:1: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?
    1 | #include<iostream>
  +++ |+#include <cstring>
    2 | 
0_0_38896294_11964.cpp: In function 'Matrix quick_power(Matrix, int, int)':
0_0_38896294_11964.cpp:76:9: error: 'memset' was not declared in this scope
   76 |         memset(result.mat, 0, sizeof(result.mat));
      |         ^~~~~~
0_0_38896294_11964.cpp:76:9: note: 'memset' is defined in header '<cstring>'; did you forget to '#include <cstring>'?