View Compilation Error

0_0_13888547_27930.cpp:24:1: error: 'mat' does not name a type
 mat X,Y;
 ^
0_0_13888547_27930.cpp:26:1: error: 'mat' does not name a type
 mat mul (mat a,mat b) {
 ^
0_0_13888547_27930.cpp:40:1: error: 'mat' does not name a type
 mat power (long long k) {
 ^
0_0_13888547_27930.cpp: In function 'int main()':
0_0_13888547_27930.cpp:51:16: error: 'X' was not declared in this scope
         memset(X.m,0,sizeof(X.m));
                ^
0_0_13888547_27930.cpp:52:16: error: 'Y' was not declared in this scope
         memset(Y.m,0,sizeof(Y.m));
                ^
0_0_13888547_27930.cpp:72:13: error: expected ';' before 'ans'
         mat ans=power(n-1);
             ^
0_0_13888547_27930.cpp:73:21: error: 'ans' was not declared in this scope
         long long t=ans.m[0][4];
                     ^