Submission #772628

#	Time	Username	Problem	Language	Result	Execution time	Memory
772628		Sam_a17	Furniture (JOI20_furniture)	C++17	0 / 100	2 ms	1236 KiB

furniture

#define _CRT_SECURE_NO_WARNINGS
#include <bits/stdc++.h>
//#include "temp.cpp"
#include <cstdio>
using namespace std;
 
#ifndef ONLINE_JUDGE
#define dbg(x) cerr << #x <<" "; print(x); cerr << endl;
#else
#define dbg(x)
#endif
 
#define sz(x) (int)x.size()
#define len(x) (int)x.length()
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define clr(x) (x).clear()
#define uniq(x) x.resize(unique(all(x)) - x.begin());
#define blt __builtin_popcount
 
#define pb push_back
#define popf pop_front
#define popb pop_back
#define ld long double
#define ll long long
 
void print(long long t) {cerr << t;}
void print(int t) {cerr << t;}
void print(string t) {cerr << t;}
void print(char t) {cerr << t;}
void print(double t) {cerr << t;}
void print(long double t) {cerr << t;}
void print(unsigned long long t) {cerr << t;}
 
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
#define nl '\n'
 
// Indexed Set  
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
 
template <class T, class V> void print(pair <T, V> p);
template <class T> void print(vector <T> v);
template <class T> void print(set <T> v);
template <class T, class V> void print(map <T, V> v);
template <class T> void print(multiset <T> v);
template <class T, class V> void print(T v[],V n) {cerr << "["; for(int i = 0; i < n; i++) {print(v[i]); cerr << " "; } cerr << "]";}
template <class T, class V> void print(pair <T, V> p) {cerr << "{"; print(p.first); cerr << ","; print(p.second); cerr << "}";}
template <class T> void print(vector <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
// template <class T> void print(vector <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(set <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(multiset <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(Tree <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T, class V> void print(map <T, V> v) {cerr << "[ "; for (auto i : v) {print(i); cerr << " ";} cerr << "]";}
template <class T> void print(deque <T> v) {cerr << "[ "; for (T i : v) {print(i); cerr << " ";} cerr << "]";}
 
 
// for random generations
mt19937 myrand(chrono::steady_clock::now().time_since_epoch().count());
// mt19937 myrand(131);
 
// for grid problems
int dx[8] = {-1,0,1,0,1,-1,1,-1};
int dy[8] = {0,1,0,-1,1,1,-1,-1};
 
// lowest / (1 << 17) >= 1e5 / (1 << 18) >= 2e5 / (1 << 21) >= 1e6
void fastIO() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr); cout.tie(nullptr);
}
// file in/out
void setIO(string str = "") {
  fastIO();
 
  // if(str == "input") {
    // freopen("input.txt", "r", stdin);
    // freopen("output.txt", "w", stdout);
  // } else if(str != "") {
    // freopen((str + ".in").c_str(), "r", stdin);
    // freopen((str + ".out").c_str(), "w", stdout);
  // }
}

const int inf = 1e9;
const long long mod = 1e9 + 7;
const int N = 1005;
bool vis[N][N];
int a[N][N];
int n, m, when[1005][1005];
pair<int, int> p[N][N];
int hs[N][N], dp[N][N];
bool don[N][N];


bool check() {
  queue<pair<int, int>> q;
  vector<pair<int, int>> pte;
  vis[1][1] = true;
  q.push({1, 1});
  pte.emplace_back(1, 1);

  int ok = 0;
  while(!q.empty()) {
    auto u = q.front();
    q.pop();
    int x = u.first, y = u.second;

    if(x == n && y == m) {
      ok = 1;
      break;
    }

    if(x + 1 <= n && a[x + 1][y] == 0) {
      if(!vis[x + 1][y]) {
        vis[x + 1][y] = true;
        pte.emplace_back(x + 1, y);
        q.push({x + 1, y});
      }
    }

    
    if(y + 1 <= m && a[x][y + 1] == 0) {
      if(!vis[x][y + 1]) {
        vis[x][y + 1] = true;
        pte.emplace_back(x, y + 1);
        q.push({x, y + 1});
      }
    }
  }

  for(auto i: pte) {
    vis[i.first][i.second] = false;
  }

  return ok;
}

void solve_() {
  cin >> n >> m;

  for(int i = 1; i <= n; i++) {
    for(int j = 1; j <= m; j++) {
      cin >> a[i][j];
    }
  }

  int q; cin >> q;
  vector<pair<int, int>> qr, nqr;
  for(int i = 1; i <= q; i++) {
    int x, y; cin >> x >> y;
    qr.emplace_back(x, y);
    hs[x][y] = i - 1;
  }

  nqr = qr;

  vector<int> to_del(q + 1);
  while(true) {
    int ina = 0, inb = sz(nqr) - 1, ans = -1, mn = 0;

    while(ina <= inb) {
      int mid = (ina + inb) / 2;
      for(int i = mn; i <= mid; i++) {
        a[nqr[i].first][nqr[i].second] = 1;
      }
      
      if(!check()) {
        ans = mid;
        inb = mid - 1;
      } else {
        mn = mid + 1;
        ina = mid + 1;
      }

      for(int i = mn; i <= mid; i++) {
        a[nqr[i].first][nqr[i].second] = 0;
      }
  
    }

    if(ans == -1) {
      break;
    }

    vector<pair<int, int>> de;
    int xi = nqr[ans].first, yi = nqr[ans].second;
    for(auto i: nqr) {
      if(i.first == xi && i.second == yi) continue;

      if(i.first > xi && i.second > yi) {
        continue;
      }

      if(i.first < xi && i.second < yi) {
        continue;
      }

      de.emplace_back(i);
    }


    to_del[hs[xi][yi]] = true;
    for(int i = 0; i < ans; i++) {
      a[nqr[i].first][nqr[i].second] = 1;
    }
    nqr = de;
  }

  
  for(int i = 0; i < q; i++) {
    int x = qr[i].first, y = qr[i].second;
    if(to_del[i]) {
      cout << 0 << '\n';
    } else {
      cout << 1 << '\n';
    }
  }

}
 
int main() {
  setIO();
 
  auto solve = [&](int test_case)-> void {
    for(int i = 1; i <= test_case; i++) {
      solve_();
    }
  };
 
  int test_cases = 1;
  // cin >> test_cases;
  solve(test_cases);
 
  return 0;
} 

Compilation message (stderr)

furniture.cpp: In function 'void solve_()':
furniture.cpp:211:9: warning: unused variable 'x' [-Wunused-variable]
  211 |     int x = qr[i].first, y = qr[i].second;
      |         ^
furniture.cpp:211:26: warning: unused variable 'y' [-Wunused-variable]
  211 |     int x = qr[i].first, y = qr[i].second;
      |                          ^

• Subtask 1: 0 / 5
• Subtask 2: 0 / 95