/in/foo.cc:7:5: error: '__int64' does not name a type; did you mean '__int64_t'?
     __int64 a[N][N];
     ^~~~~~~
     __int64_t
/in/foo.cc: In function 'Matrix mul(Matrix, Matrix)':
/in/foo.cc:13:16: error: 'struct Matrix' has no member named 'a'
     memset(tmp.a,0,sizeof(tmp.a));
                ^
/in/foo.cc:13:31: error: 'struct Matrix' has no member named 'a'
     memset(tmp.a,0,sizeof(tmp.a));
                               ^
/in/foo.cc:18:21: error: 'struct Matrix' has no member named 'a'
                 tmp.a[i][j]+=(x.a[i][k]*y.a[k][j])%M;
                     ^
/in/foo.cc:18:33: error: 'struct Matrix' has no member named 'a'
                 tmp.a[i][j]+=(x.a[i][k]*y.a[k][j])%M;
                                 ^
/in/foo.cc:18:43: error: 'struct Matrix' has no member named 'a'
                 tmp.a[i][j]+=(x.a[i][k]*y.a[k][j])%M;
                                           ^
/in/foo.cc:19:21: error: 'struct Matrix' has no member named 'a'
                 tmp.a[i][j]%=M;
                     ^
/in/foo.cc: In function 'void quickpow(int)':
/in/foo.cc:26:16: error: 'struct Matrix' has no member named 'a'
     memset(res.a,0,sizeof(res.a));
                ^
/in/foo.cc:26:31: error: 'struct Matrix' has no member named 'a'
     memset(res.a,0,sizeof(res.a));
                               ^
/in/foo.cc:28:13: error: 'struct Matrix' has no member named 'a'
         res.a[i][i]=1;
             ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:47:18: error: 'struct Matrix' has no member named 'a'
         memset(A.a,0,sizeof(A.a));
                  ^
/in/foo.cc:47:31: error: 'struct Matrix' has no member named 'a'
         memset(A.a,0,sizeof(A.a));
                               ^
/in/foo.cc:49:15: error: 'struct Matrix' has no member named 'a'
             A.a[i][i-1]=1;
               ^
/in/foo.cc:51:15: error: 'struct Matrix' has no member named 'a'
             A.a[i][k]=1;
               ^
/in/foo.cc:54:23: error: 'struct Matrix' has no member named 'a'
         memset(origin.a,0,sizeof(origin.a));
                       ^
/in/foo.cc:54:41: error: 'struct Matrix' has no member named 'a'
         memset(origin.a,0,sizeof(origin.a));
                                         ^
/in/foo.cc:56:20: error: 'struct Matrix' has no member named 'a'
             origin.a[1][i]=f[i];
                    ^
/in/foo.cc:58:27: error: 'struct Matrix' has no member named 'a'
         printf("%d\n",ans.a[1][n]%M);
                           ^