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View Compilation Error

0_0_29301738_7574.c:9:1: error: unknown type name 'mat'
 mat mult(mat a,mat b)
 ^
0_0_29301738_7574.c:9:10: error: unknown type name 'mat'
 mat mult(mat a,mat b)
          ^
0_0_29301738_7574.c:9:16: error: unknown type name 'mat'
 mat mult(mat a,mat b)
                ^
0_0_29301738_7574.c:26:1: error: unknown type name 'mat'
 mat quick(mat a,long long n)
 ^
0_0_29301738_7574.c:26:11: error: unknown type name 'mat'
 mat quick(mat a,long long n)
           ^
0_0_29301738_7574.c: In function 'main':
0_0_29301738_7574.c:55:13: error: unknown type name 'mat'
             mat c,d;
             ^
0_0_29301738_7574.c:56:14: error: request for member 'x' in something not a structure or union
             c.x[1][1]=c.x[1][2]=c.x[2][1]=1;
              ^
0_0_29301738_7574.c:56:24: error: request for member 'x' in something not a structure or union
             c.x[1][1]=c.x[1][2]=c.x[2][1]=1;
                        ^
0_0_29301738_7574.c:56:34: error: request for member 'x' in something not a structure or union
             c.x[1][1]=c.x[1][2]=c.x[2][1]=1;
                                  ^
0_0_29301738_7574.c:57:14: error: request for member 'x' in something not a structure or union
             c.x[2][2]=0;
              ^
0_0_29301738_7574.c:58:13: error: unknown type name 'mat'
             mat w=quick(c,n-2);
             ^
0_0_29301738_7574.c:60:19: error: request for member 'x' in something not a structure or union
             ans1=w.x[1][1]%(mod-1);
                   ^
0_0_29301738_7574.c:61:19: error: request for member 'x' in something not a structure or union
             ans2=w.x[2][1]%(mod-1);
                   ^


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