View Compilation Error

0_0_26027648_13356.cpp: In function 'LL powmod(LL, LL)':
0_0_26027648_13356.cpp:28:52: error: 'assert' was not declared in this scope
 LL powmod(LL a, LL b) {LL res=1;a%=MOD; assert(b>=0); for(;b;b>>=1){if(b&1)res=res*a%MOD;a=a*a%MOD;}return res;}
                                                    ^
0_0_26027648_13356.cpp: At global scope:
0_0_26027648_13356.cpp:146:1: error: 'bitset' does not name a type
 bitset<SN+1> dp[MAXN];
 ^
0_0_26027648_13356.cpp: In function 'void dfsDP(int)':
0_0_26027648_13356.cpp:154:5: error: 'dp' was not declared in this scope
     dp[x].reset();
     ^
0_0_26027648_13356.cpp:154:5: note: suggested alternative:
0_0_26027648_13356.cpp:53:9: note:   'LCA::dp'
     int dp[Maxn*2][25];
         ^