/in/foo.cc:28:10: error: 'N' was not declared in this scope
 double d[N];
          ^
/in/foo.cc:29:10: error: 'M' was not declared in this scope
 point pt[M*4];
          ^
/in/foo.cc:30:9: error: 'M' was not declared in this scope
 wall wl[M*3];
         ^
/in/foo.cc:32:18: error: 'N' was not declared in this scope
 vector<edge> adj[N]; 
                  ^
/in/foo.cc: In function 'void dijkstra()':
/in/foo.cc:51:27: error: 'd' was not declared in this scope
     for(int i=1;i<=n;++i) d[i] = inf;
                           ^
/in/foo.cc:51:34: error: 'inf' was not declared in this scope
     for(int i=1;i<=n;++i) d[i] = inf;
                                  ^~~
/in/foo.cc:51:34: note: suggested alternative: 'ynf'
     for(int i=1;i<=n;++i) d[i] = inf;
                                  ^~~
                                  ynf
/in/foo.cc:52:5: error: 'd' was not declared in this scope
     d[s] = 0;
     ^
/in/foo.cc:61:13: error: 'adj' was not declared in this scope
         l = adj[u].size();
             ^~~
/in/foo.cc: In function 'void build(int, point)':
/in/foo.cc:77:15: error: 'pt' was not declared in this scope
         pt2 = pt[i];
               ^~
/in/foo.cc:77:15: note: suggested alternative: 'pt2'
         pt2 = pt[i];
               ^~
               pt2
/in/foo.cc:79:35: error: 'wl' was not declared in this scope
             if(!intersect(pt1,pt2,wl[j])) continue;
                                   ^~
/in/foo.cc:84:9: error: 'adj' was not declared in this scope
         adj[from].push_back(edge(i,dis(pt1.x,pt1.y,pt2.x,pt2.y)));
         ^~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:92:5: error: 'pt' was not declared in this scope
     pt[1] = point(0,5); 
     ^~
/in/foo.cc:96:9: error: 'wl' was not declared in this scope
         wl[(i-1)*3+1] = wall(x,10,b2);
         ^~
/in/foo.cc:109:20: error: 'd' was not declared in this scope
     printf("%.2lf",d[n]);
                    ^