View Compilation Error

0_0_30466602_2387.cpp:58:11: error: redefinition of 'const int maxn'
 const int maxn = 30;  
           ^
0_0_30466602_2387.cpp:9:11: note: 'const int maxn' previously defined here
 const int maxn=30;
           ^
0_0_30466602_2387.cpp: In function 'int main()':
0_0_30466602_2387.cpp:64:14: error: 'T' was not declared in this scope
  scanf("%d",&T);
              ^
0_0_30466602_2387.cpp:101:4: error: 'ant' was not declared in this scope
    ant[cnt++]=nex;
    ^
0_0_30466602_2387.cpp:102:25: error: '_angle' was not declared in this scope
    ang=_angle(now-p[nex]);
                         ^
0_0_30466602_2387.cpp:110:17: error: 'ant' was not declared in this scope
    printf(" %d",ant[i]);
                 ^