View Compilation Error

0_0_32867453_30236.cpp:1:7: error: stray '#' in program
 <code>#include<bits/stdc++.h>
       ^
0_0_32867453_30236.cpp:1:1: error: expected unqualified-id before '<' token
 <code>#include<bits/stdc++.h>
 ^
0_0_32867453_30236.cpp: In function 'void _Polynomial::DFT(int*, int, int)':
0_0_32867453_30236.cpp:36:48: error: 'swap' was not declared in this scope
         FOR(i,0,n-1)if(i<r[i])swap(a[i],a[r[i]]);
                                                ^
0_0_32867453_30236.cpp: In function 'int main()':
0_0_32867453_30236.cpp:105:18: error: 'scanf' was not declared in this scope
     scanf("%d",&T);
                  ^
0_0_32867453_30236.cpp:113:42: error: 'printf' was not declared in this scope
         printf("%lld\n",((ans-prd)%P+P)%P);
                                          ^