Submission #288104

#	Time	Username	Problem	Language	Result	Execution time	Memory
288104		erd1	Ideal city (IOI12_city)	C++14	0 / 100	596 ms	4708 KiB

city

#include<bits/stdc++.h>
using namespace std;
/*
#include<bits/extc++.h>
using namespace __gnu_pbds;
template<typename T>
using order_statistics_tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
*/
#define int lld
#define ff first
#define ss second
#define all(x) (x).begin(), (x).end()
#define pb push_back
typedef int64_t lld;
typedef pair<int, int> pii;
typedef long double ld;

template<typename T1, typename T2>
ostream& operator<<(ostream& out, pair<T1, T2> p){
  return out << "(" << p.ff << ", " << p.ss << ")";
}

template<typename Iter>
ostream& outIt(ostream& out, Iter b, Iter e){
  for(Iter i = b; i != e; i++)
    out << (i==b?"":" ") << *i;
  return out;
}

template<typename T>
ostream& operator<<(ostream& out, vector<T> v){
  return outIt(out << '[', all(v)) << ']';
}


template<typename T1, typename T2>
ostream& operator<<(ostream& out, map<T1, T2> m){
  return outIt(out << '{', all(m)) << '}';
}

template<typename T>
using min_heap = priority_queue<T, vector<T>, greater<T>>;

template<typename T1, typename T2>
pair<T1, T2>& operator+=(pair<T1, T2>& a, pair<T1, T2> p){
  return a.ff += p.ff, a.ss += p.ss, a;
}

typedef vector<pii>::iterator it;

const int mod = 1000000007;

vector<vector<int>> G;
min_heap<pair<int, pii>> q;
vector<bool> gone;
void toX(it begs, it ends, int targ, map<int, pii>& ans){ // points should be sorted;
  //outIt(cout << "toX", begs, ends) << " " << targ << endl;
  int n = ends-begs;
  for(int i = 0; i < n; i++)G[i].resize(0);
  for(int i = 0; i < n; i++){
    auto pi = begs[i];
    auto it1 = lower_bound(begs, ends, (pii){pi.ff+1, pi.ss}), it2 = lower_bound(begs, ends, (pii){pi.ff, pi.ss+1});
    if(it1 != ends && *it1 == (pii){pi.ff+1, pi.ss})
      G[i].pb(it1-begs), G[it1-begs].pb(i);
    if(it2 != ends && *it2 == (pii){pi.ff, pi.ss+1})
      G[i].pb(it2-begs), G[it2-begs].pb(i);
    if(pi.ff == targ)q.push({0, {i, pi.ss}});
  }
  //cout << G << endl;
  ans.clear();
  for(int i = 0; i < n; i++)gone[i] = 0;
  while(q.size()){
    auto a = q.top(); q.pop();
    if(gone[a.ss.ff])continue;
    gone[a.ss.ff] = true;
    ans[a.ss.ss] += {a.ff, 1};
    ans[a.ss.ss].ff%=mod;
    //cout << a << endl;
    for(auto i: G[a.ss.ff])
      if(!gone[i])q.push({a.ff+1, {i, a.ss.ss}});
  }
  //cout << ans << endl;
  //return ans;
}

map<int, pii> mpa, mpb;
//int ccc = 0;
int calcSum(it begs, it ends, int xl, int xr, int yl, int yr, int ccc = 0){
  assert(ccc++ < 100);
  //outIt(cout << "calc sum", begs, ends) << " " << make_pair(make_pair(xl, xr), make_pair(yl, yr)) << endl;
  //for(auto i = begs; i != ends; i++)assert(i->ff >= xl && i->ff < xr && i->ss >= yl && i->ss < yr);
  if(begs == ends)return 0;
  if(next(begs) == ends) return 0;
  if(next(begs) == prev(ends))return 1;
  int n = ends - begs;
  sort(begs, ends);
  int midx = (xl+xr)/2;
  it mid = lower_bound(begs, ends, (pii){midx, INT_MIN});//, mid2 = lower_bound(begs, ends, (pii){midx+1, INT_MIN});
  //cout << midx << " " << ends-mid << endl;
  //it mid = max(mid1-begs, ends-mid1) > max(mid2-begs, ends-mid2)?mid2:mid1;
  lld ans = 0;
  if(mid != begs && mid != ends){
    //midx = mid->ff;
    toX(begs, mid, midx-1, mpa); toX(mid, ends, midx, mpb);
    lld acnt = 0, bcnt = 0, asum = 0, bsum = 0, ldis = -1;
    for(auto ita = mpa.begin(), itb = mpb.begin(); ita != mpa.end() || itb != mpb.end();){
      if(ita == mpa.end() || itb != mpb.end() && *itb < *ita){
        //cout << "inb" << *itb << acnt << endl;
        (asum += acnt*(itb->ff-ldis))%=mod, (bsum += bcnt*(itb->ff-ldis))%=mod;
        (ans += asum*itb->ss.ss%mod + itb->ss.ff*acnt%mod + itb->ss.ss*acnt%mod)%=mod;
        (bsum += itb->ss.ff)%=mod, (bcnt += itb->ss.ss)%=mod;
        ldis = itb->ff;
        ++itb;
      }else {
        (asum += acnt*(ita->ff-ldis))%=mod, (bsum += bcnt*(ita->ff-ldis))%=mod;
        (ans += bsum*ita->ss.ss + ita->ss.ff*bcnt + ita->ss.ss*bcnt)%=mod;
        (asum += ita->ss.ff)%=mod, (acnt += ita->ss.ss)%=mod;
        ldis = ita->ff;
        ++ita;
      }
      //cout << acnt << " " << bcnt << " " << ans << endl;
    }
  }
  /*
  {
    int ansx = 0;
    for(auto ax: mpa)
      for(auto bx: mpb)
        ansx += (abs(ax.ff-bx.ff)+1)*ax.ss.ss*bx.ss.ss + ax.ss.ff*bx.ss.ss + ax.ss.ss*bx.ss.ff;
    assert(ansx == ans);
  }
  */
  //outIt(cout << "calc sum", begs, ends) << " " << ans << endl;
  for(auto i = begs; i != ends; i++)swap(i->ff, i->ss);
  return (ans + calcSum(begs, mid, yl, yr, xl, midx, ccc) + calcSum(mid, ends, yl, yr, midx, xr, ccc))%mod;
}

vector<pii> v;
signed DistanceSum(signed N, signed *X, signed *Y) {
  G.resize(N), gone.resize(N);
  for(int i = 0; i < N; i++)v.pb({X[i], Y[i]});

  int ans = 0;
  for(int i = 0; i < N; i++)
    for(int j = i; j < N; j++)
      ans += abs(X[i]-X[j]) + abs(Y[i]-Y[j]);
  //cout << ans << endl;
//*/
  int ans2 = calcSum(all(v), 0, INT_MAX, 0, INT_MAX);
  assert(ans == ans2);
  return ans2;
}

Compilation message (stderr)

city.cpp: In function 'lld calcSum(it, it, lld, lld, lld, lld, lld)':
city.cpp:107:47: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  107 |       if(ita == mpa.end() || itb != mpb.end() && *itb < *ita){
      |                              ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~
city.cpp:95:7: warning: unused variable 'n' [-Wunused-variable]
   95 |   int n = ends - begs;
      |       ^

• Subtask 1: 0 / 11
• Subtask 2: 0 / 21
• Subtask 3: 0 / 23
• Subtask 4: 0 / 45