View Compilation Error

0_0_34695189_526.cpp: In function 'int solve()':
0_0_34695189_526.cpp:55:97: error: 'max' was not declared in this scope
                 dp[ next[j][k] ][i] = max( dp[ next[j][k] ][i], dp[j][i-1]+mny[ next[j][k] ][i] );
                                                                                                 ^
0_0_34695189_526.cpp: In function 'int main()':
0_0_34695189_526.cpp:67:31: error: 'scanf' was not declared in this scope
     while(scanf("%d%d", &n, &m), n+m)
                               ^
0_0_34695189_526.cpp:74:38: error: 'printf' was not declared in this scope
         if(ans>0)   printf("%d\n",ans);
                                      ^
0_0_34695189_526.cpp:75:34: error: 'printf' was not declared in this scope
         else printf("STAY HOME\n");
                                  ^