View Compilation Error

0_0_35530885_9605.cpp:21:1: error: 'Point' does not name a type
 Point b[105]; 
 ^
0_0_35530885_9605.cpp: In function 'int main()':
0_0_35530885_9605.cpp:50:21: error: 'b' was not declared in this scope
    scanf("%lf%lf", &b[i].x, &b[i].y);
                     ^
0_0_35530885_9605.cpp:54:18: error: 's' was not declared in this scope
                a[s].y=j;
                  ^
0_0_35530885_9605.cpp:55:15: error: 'b' was not declared in this scope
       t=sqrt((b[i].x-b[j].x)*(b[i].x-b[j].x)+(b[i].y-b[j].y)*(b[i].y-b[j].y));
               ^