Function calch

code/graph/idastar.cpp:2–5

int n, cur[100], pos;
int calch() {
  int h = 0;
  rep(i,0,n) if (cur[i] != 0) h += abs(i - cur[i]);
  return h; }
int dfs(int d, int g, int prev) {
  int h = calch();
  if (g + h > d) return g + h;