View Compilation Error

0_0_21601295_583.cpp:1:8: error: 'maxn' was not declared in this scope
 int dp[maxn][maxn];
        ^
0_0_21601295_583.cpp:1:14: error: 'maxn' was not declared in this scope
 int dp[maxn][maxn];
              ^
0_0_21601295_583.cpp: In function 'void Floyd()':
0_0_21601295_583.cpp:4:9: error: 'dp' was not declared in this scope
  memset(dp,0x3f3f3f3f,sizeof(dp));
         ^
0_0_21601295_583.cpp:4:33: error: 'memset' was not declared in this scope
  memset(dp,0x3f3f3f3f,sizeof(dp));
                                 ^
0_0_21601295_583.cpp:5:17: error: 'n' was not declared in this scope
  for(int k=1;k<=n;k++){
                 ^
0_0_21601295_583.cpp:8:44: error: 'min' was not declared in this scope
     dp[i][j]=min(dp[i][j],dp[i][k]+dp[k][j]);
                                            ^