1 #include <bits/stdc++.h>
 2 using namespace std;
 3
 4
 5 const int N(105);
 6
 7 int dp[N][2][N][2][N];
 8 int x1, x2, y1, y2;
 9
10 int dfs(int x1, int s, int x2, int t, int y){
11     int & now=dp[x1][s][x2][t][y];
12     if(~now) return now;
13     int sum=0, cnt=0;
14     if(s==0){
15         sum+=dfs(x1, 1, x2, t, y-1), cnt++;
16         if(t==0)
17             sum+=dfs(x1, s, x2, 1, y-1), cnt++;
18         else if(x2>0)
19             sum+=dfs(x1, 0, x2-1, t, y), cnt++;
20     }
21     else{
22         if(x1>0) sum+=dfs(x1-1, s, x2, t, y), cnt++;
23         if(t==0)
24             sum+=dfs(x1, s, x2, 1, y-1), cnt++;
25         else if(x2>0)
26             sum+=dfs(x1, s, x2-1, t, y), cnt++;
27     }
28
29     if((y1+1)*(1-s)+(y2+1)*(1-t)< y) //forbidden numbers;
30         sum+=dfs(x1, s, x2, t, y-1), cnt++;
31
32     return now = sum!=cnt;
33 }
34
35 int a[N];
36
37 int main(){
38     int T;
39     int n;
40     for(cin>>T; T--; ){
41         cin>>n;
42         int p;
43         for(int i=0; i<n; i++){
44             cin>>a[i];
45             if(a[i]==1) p=i;
46         }
47         x1=0, x2=0, y1=0, y2=0;
48         int i;
49
50         for(i=p-1; i>=0 && a[i]>a[i+1]; i--, x1++);
51
52         for(; i>=0 && a[i]<a[i+1]; i--, y1++);
53         for(i=p+1; i<n && a[i]>a[i-1]; i++, x2++);
54         for(; i<n && a[i]<a[i-1]; i++, y2++);
55
56         memset(dp, -1, sizeof(dp));
57         x1=max(x1-1, 0), x2=max(x2-1, 0);
58
59         // cout<<x1<<' '<<x2<<' '<<y1<<' '<<y2<<endl;
60         int peak=(p!=0) + (p!=n-1);
61         for(int i=0; i<=n-1-x1-x2-peak; i++)
62             dp[0][1][0][1][i]=1;    //error-prone
63
64         int s=p==0, t=p==n-1;   //error-prone
65
66         int res=dfs(x1, s, x2, t, n-1-x1-x2);
67         // cout<<res<<endl;
68         puts(res==1?"Alice": "Bob");
69     }
70     return 0;
71 }

g++ main.cpp -std=c++11 -o main && ./main <in

main.cpp:8:13: error: ‘int y1’ redeclared as different kind of symbolint x1, x2, y1, y2;^
In file included from /usr/include/features.h:374:0,from /usr/include/assert.h:35,from /usr/include/c++/4.8/cassert:43,from /usr/include/x86_64-linux-gnu/c++/4.8/bits/stdc++.h:33,from main.cpp:1:
/usr/include/x86_64-linux-gnu/bits/mathcalls.h:241:1: error: previous declaration of ‘double y1(double)’__MATHCALL (y1,, (_Mdouble_));^