Submission #230154

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
230154	2020-05-08T18:14:17 Z	xiaowuc1	Inspector (POI13_ins)	C++14	0 / 100	4480 ms	6596 KB

ins

#include <algorithm>
#include <bitset>
#include <cassert>
#include <chrono>
#include <complex>
#include <cstring>
#include <iomanip>
#include <iostream>
#include <map>
#include <queue>
#include <random>
#include <set>
#include <stack>
#include <unordered_set>
#include <vector>

using namespace std;

// BEGIN NO SAD
#define rep(i, a, b) for(int i = a; i < (b); ++i)
#define trav(a, x) for(auto& a : x)
#define all(x) x.begin(), x.end()
#define sz(x) (int)(x).size()
#define derr if(1) cerr
typedef vector<int> vi;
// END NO SAD

typedef long long ll;
typedef pair<int, int> pii;
typedef vector<vector<ll>> matrix;

typedef pair<int, pii> state;

struct statement {
  int t, person, work, orig;
  bool operator<(statement& s) {
    return t < s.t;
  }
};

int n, m;
statement l[100005];

int earliest[100005];
int latest[100005];
bool can(int k) {
  memset(earliest, 1, sizeof(earliest));
  memset(latest, -1, sizeof(latest));
  int lastt = -1;
  int lastclaim = -1;
  // first check that everyone claims the same number of people
  for(int i = 0; i < m; i++) {
    if(l[i].orig >= k) continue;
    if(l[i].work > n) return false;
    if(l[i].t == lastt && l[i].work != lastclaim) return false;
    lastt = l[i].t;
    lastclaim = l[i].work;
    earliest[l[i].person] = min(earliest[l[i].person], i);
    latest[l[i].person] = i;
  }
  set<int> working; // working
  set<pii> preworking;
  int postworking = 0; // working
  int flexible = 0;
  set<pii> preempt; // working
  for(int i = 1; i <= n; i++) {
    if(earliest[i] <= 1e6) preworking.insert({earliest[i], i});
    else flexible++;
  }
  for(int i = 0; i < m; i++) {
    if(l[i].orig >= k) continue;
    // if it is their first statement, they must start working now
    if(earliest[l[i].person] == i) {
      preworking.erase({earliest[i], i});
      preempt.erase({earliest[i], i});
      working.insert(i);
    }
    while(sz(working) + postworking + sz(preempt) < l[i].work) {
      if(sz(preworking)) {
        preempt.insert(*preworking.begin());
        preworking.erase(preworking.begin());
      }
      else if(flexible) {
        postworking++;
        flexible--;
      }
      else {
        return false;
      }
    }
    while(sz(working) + postworking + sz(preempt) > l[i].work) {
      if(postworking > 0) {
        postworking--;
      }
      else if(sz(preempt) && flexible) {
        preworking.insert(*preempt.begin());
        preempt.erase(preempt.begin());
        flexible--;
      }
      else {
        return false;
      }
    }
    // if it is their last statement, they are post-working now
    if(latest[l[i].person] == i) {
      working.erase(i);
      postworking++;
    }
  }
  return true;
}

void rsolve() {
  cin >> n >> m;
  for(int i = 0; i < m; i++) {
    l[i].orig = i;
    cin >> l[i].t >> l[i].person >> l[i].work;
    l[i].work++;
  }
  sort(l, l+m);
  int lhs = 0;
  int rhs = m;
  while(lhs < rhs) {
    int mid = (lhs+rhs+1)/2;
    if(can(mid)) lhs = mid;
    else rhs = mid - 1;
  }
  cout << lhs << "\n";
}

void solve() {
  int t;
  cin >> t;
  while(t--) rsolve();
}
// are there edge cases (N=1?)
// are array sizes proper (scaled by proper constant, for example 2* for koosaga tree)
// integer overflow?
// DS reset properly between test cases

int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL); cout.tie(NULL);
  solve();
}

Subtask #1

0.0 / 100.0

#	Verdict	Execution time	Memory	Grader output
1	Incorrect	8 ms	1152 KB	Output isn't correct
2	Incorrect	11 ms	1152 KB	Output isn't correct
3	Incorrect	12 ms	1152 KB	Output isn't correct
4	Incorrect	13 ms	1152 KB	Output isn't correct
5	Incorrect	24 ms	1152 KB	Output isn't correct
6	Incorrect	34 ms	1272 KB	Output isn't correct
7	Incorrect	52 ms	1280 KB	Output isn't correct
8	Incorrect	266 ms	1528 KB	Output isn't correct
9	Incorrect	627 ms	2168 KB	Output isn't correct
10	Incorrect	1495 ms	3324 KB	Output isn't correct
11	Incorrect	1496 ms	3576 KB	Output isn't correct
12	Incorrect	4480 ms	6508 KB	Output isn't correct
13	Incorrect	4010 ms	6596 KB	Output isn't correct