Submission #67895

#	Time	Username	Problem	Language	Result	Execution time	Memory
67895		funcsr	Teams (IOI15_teams)	C++17	77 / 100	4041 ms	374564 KiB

teams

#include "teams.h"
#include <vector>
#include <cassert>
#include <algorithm>
#include <iostream>
using namespace std;
#define rep(i, n) for (int i=0; i<(n); i++)
#define all(x) x.begin(), x.end()
#define uniq(x) x.erase(unique(all(x)), x.end())
#define index(x, y) (int)(lower_bound(all(x), y)-x.begin())
#define pb push_back
const int MAX_N = 5e5+10;

struct Node {
  int val;
  Node *left, *right;
  Node() : val(0), left(NULL), right(NULL) {}
};

int query(Node *n, int a, int b, int l=0, int r=MAX_N) {
  if (b <= l || r <= a) return 0;
  if (a <= l && r <= b) return n->val;
  int ret = 0;
  if (n->left)  ret += query(n->left, a, b, l, (l+r)/2);
  if (n->right) ret += query(n->right, a, b, (l+r)/2, r);
  return ret;
}
Node *add(Node *n, int x, int l=0, int r=MAX_N) {
  if (r-l == 1) {
    Node *ret = new Node();
    ret->val = n->val+1;
    return ret;
  }
  if (n->left == NULL) n->left = new Node();
  if (n->right == NULL) n->right = new Node();
  Node *ret = new Node();
  if (x < (l+r)/2) {
    ret->left = add(n->left, x, l, (l+r)/2);
    ret->right = n->right;
  }
  else {
    ret->left = n->left;
    ret->right = add(n->right, x, (l+r)/2, r);
  }
  ret->val = n->val+1;
  return ret;
}

int N;
vector<int> G[500010];
Node *seg[500010];

inline int count(int l, int a, int b) { return query(seg[l], a, b+1); }

void init(int NN, int A[], int B[]) {
  N = NN;
  rep(i, N) G[A[i]].pb(B[i]);
  seg[0] = new Node();
  for (int i=1; i<=N; i++) {
    seg[i] = seg[i-1];
    for (int r : G[i]) seg[i] = add(seg[i], r);
  }
}

int C[500010];
int demand[500010];
int used[500010];

int can(int MM, int K[]) {
  long long sum = 0;
  rep(i, MM) sum += K[i];
  if (sum > N) return 0;
  sort(K, K+MM);
  vector<int> xs(K, K+MM); uniq(xs);
  int M = xs.size();
  rep(i, M) C[i] = demand[i] = used[i] = 0;
  rep(i, MM) demand[index(xs, K[i])] += K[i];
  //cout<<"xs={";for(int x :xs)cout<<x<<",";cout<<"}\n";

  rep(k, M) {
    int d = demand[k];
    for (int r=k; r<M; r++) {
      int rpos = r+1==xs.size()?N:(xs[r+1]-1);
      //C[r] += count(xs[k], xs[r], rpos) - (k>=1?count(xs[k-1], xs[r], rpos):0);
      int e = min(count(xs[k], xs[r], rpos)-used[r], d);
      d -= e;
      used[r] += e;
      if (d == 0) break;
    }
    if (d > 0) return 0;
  }
  return 1;
}

Compilation message (stderr)

teams.cpp: In function 'int can(int, int*)':
teams.cpp:75:18: warning: conversion to 'int' from 'std::vector<int>::size_type {aka long unsigned int}' may alter its value [-Wconversion]
   int M = xs.size();
           ~~~~~~~^~
teams.cpp:83:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       int rpos = r+1==xs.size()?N:(xs[r+1]-1);
                  ~~~^~~~~~~~~~~

• Subtask 1: 21 / 21
• Subtask 2: 13 / 13
• Subtask 3: 43 / 43
• Subtask 4: 0 / 23