Submission #1025293

#	Time	Username	Problem	Language	Result	Execution time	Memory
1025293		NintsiChkhaidze	Road Construction (JOI21_road_construction)	C++17	59 / 100	10022 ms	131212 KiB

road_construction

#include <bits/stdc++.h>
#define pb push_back
#define s second
#define f first
#define pb push_back
#define pii pair <int,int>
#define ll long long
#define left h*2,l,(l + r)/2
#define right h*2+1,(l + r)/2 + 1,r
#pragma GCC target("avx,avx2,fma")
#pragma GCC optimize("Ofast")
// #define int ll
#define pli pair <ll,int>
#define pll pair <ll,ll>
using namespace std;
 
const int N = 250003;
const ll inf = 1e18;
pli t[2][3*N];
int x[N],y[N],yy[N],n,k,L,R;
multiset <ll> st[2][3*N];
pii arr[N];
vector <ll> answ;
ll oldval,newval,w1;
int idx,v1,v2,id;
bool z,ID;
pli res;
 
void upd(int h,int l,int r){
  if (l == r){
    if (!z) st[ID][l].erase(st[ID][l].find(oldval));
    st[ID][l].insert(newval);
    t[ID][h] = {*--st[ID][l].end(),l};
    return;
  }
 
  if (idx > (l + r)/2) upd(right);
  else upd(left);
  t[ID][h] = max(t[ID][h*2],t[ID][h*2 + 1]);
}
 
void build(int h,int l,int r){
  t[1][h] = t[0][h] = {-inf,0};
  if (l == r) {
    st[1][l].clear();
    st[0][l].clear();
    return;
  }
  build(left);
  build(right);
}
 
pli get(int h,int l,int r){
  if (r < L || R < l) return {-inf,0};
  if (L <= l && r <= R) return t[ID][h];
  return max(get(left),get(right));
}
 
int count(ll w,bool zz){
 
  build(1,1,n);
  int tot = 0,i,j;
 
  for (i = 1; i <= n; i++){
    if (tot > k) return tot;
    vector <pair <pii,pll> > roll;
 
    id = arr[i].s; v1 = x[id] + y[id];
    while (tot <= k){
      L = 1; R = yy[id]; ID = 0;
      res = get(1,1,n);
      w1 = v1 - res.f;
      if (w1 > w) break;
      if (zz) answ.pb(w1);
 
      tot += 1;
      if (tot > k) return tot;
      roll.pb({{0,res.s},{res.f,-inf}});
      idx = res.s; oldval = res.f; newval = -inf;
      z = 0; ID = 0;
      upd(1,1,n);
    }
 
    v2 = x[id] - y[id];
    while (tot <= k){
      L = yy[id] + 1; R = n; ID = 1;
      res = get(1,1,n);
      w1 = v2 - res.f;
      if (w1 > w) break;
      if (zz) answ.pb(w1);
 
      tot += 1;
      if (tot > k) return tot;
      roll.pb({{1,res.s},{res.f,-inf}});
      oldval = res.f;
      newval = -inf;
      idx = res.s;
      z = 0; ID = 1;
      upd(1,1,n);
    }
    
    for (j = roll.size() - 1; j >= 0; j--){
      oldval = roll[j].s.s;
      newval = roll[j].s.f;
      idx = roll[j].f.s;
      z = 0; ID = roll[j].f.f;
      upd(1,1,n);
    }
 
    oldval = -inf;
    newval = v1;
    idx = yy[id];
    z = 1; ID = 0;
    upd(1,1,n);
 
    newval = v2; ID = 1;
    upd(1,1,n);
  }
 
  return tot;
}
 
signed main() {
  ios_base::sync_with_stdio(0),cin.tie(NULL),cout.tie(NULL);
	
  cin>>n>>k;
  
  vector <int> vec;
  for (int i = 1; i <= n; i++){
    cin >> x[i] >> y[i];
    vec.pb(y[i]);
  }
  sort(vec.begin(),vec.end());
  map <int,int> mp;
  int val = 0;
  for (int i=0;i<vec.size();i++){
    if (!i || vec[i] != vec[i - 1]) ++val;
    mp[vec[i]] = val;
  }
 
  for (int i = 1; i<= n; i++){
    yy[i] = mp[y[i]];
    arr[i] = {x[i],i};
  }
  sort(arr+1,arr+n+1);
 
  ll l = 0,r = 4e9,res = -1;
  while (l <= r){
    ll mid = (l + r) >> 1;
    //umciresi w iseti rom w ze naklebi an toli wonis wiboebis raodenoba >= k ze
  
    if (count(mid,0) >= k) {
      res = mid;
      r = mid - 1;
    }else{
      l = mid + 1;
    }
  }
 
  int cnt1 = count(res - 1,1);
  sort(answ.begin(),answ.end());
  for (int i = 1; i <= k - cnt1; i++)
    answ.pb(res);
    
  for (ll x: answ)
    cout<<x<<endl;
}

Compilation message (stderr)

road_construction.cpp: In function 'int main()':
road_construction.cpp:136:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  136 |   for (int i=0;i<vec.size();i++){
      |                ~^~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 0 / 6
• Subtask 3: 7 / 7
• Subtask 4: 20 / 20
• Subtask 5: 27 / 27
• Subtask 6: 0 / 35