View Compilation Error

0_0_37489220_28500.cpp:6:13: error: empty character constant
 int s[Maxn];''
             ^
0_0_37489220_28500.cpp:6:13: error: expected unqualified-id before '\x0'
0_0_37489220_28500.cpp: In function 'int main()':
0_0_37489220_28500.cpp:11:12: error: 'cin' was not declared in this scope
     while(~cin >> a >> n >> b)
            ^
0_0_37489220_28500.cpp:19:40: error: 'q_max' was not declared in this scope
             while(head_max<tail_max&&s[q_max[tail_max-1]]>=s[i])tail_max--;
                                        ^
0_0_37489220_28500.cpp:20:13: error: 'q_max' was not declared in this scope
             q_max[tail_max++]=i;
             ^