Submission #772657

#	Time	Username	Problem	Language	Result	Execution time	Memory
772657		Sam_a17	Furniture (JOI20_furniture)	C++17	0 / 100	2 ms	1876 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;
int vis1[N][N], vis2[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];

int di[2 * N];


bool check1() {
  queue<pair<int, int>> q;
  vector<pair<int, int>> pte;
  vis1[n][m] = true;
  q.push({n, m});

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

    if(x - 1 >= 1 && a[x - 1][y] == 0) {
      if(!vis1[x - 1][y]) {
        vis1[x - 1][y] = true;
        q.push({x - 1, y});
      }
    }
    
    if(y - 1 >= 1 && a[x][y - 1] == 0) {
      if(!vis1[x][y - 1]) {
        vis1[x][y - 1] = true;
        q.push({x, y - 1});
      }
    }
  }

  return ok;
}

bool check2() {
  queue<pair<int, int>> q;
  vector<pair<int, int>> pte;
  vis2[1][1] = true;
  q.push({1, 1});

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

    if(x + 1 <= n && a[x + 1][y] == 0) {
      if(!vis2[x + 1][y]) {
        vis2[x + 1][y] = true;
        q.push({x + 1, y});
      }
    }

    
    if(y + 1 <= m && a[x][y + 1] == 0) {
      if(!vis2[x][y + 1]) {
        vis2[x][y + 1] = true;
        q.push({x, y + 1});
      }
    }
  }

  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];
    }
  }
  check1();
  check2();

  for(int i = 1; i <= n; i++) {
    for(int j = 1; j <= m; j++) {
      if(vis1[i][j] && vis2[i][j]) {
        dp[i][j] = 1;
        di[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;

    int ok = 1;
    
    if(!dp[x][y]) {
      cout << 1 << '\n';
      continue;
    }

    if(di[x + y] == 1) {
      cout << 0 << '\n';
      continue;
    }

    int cnt = 0;
    if(x - 1 >= 1 && y + 1 <= m && !dp[x - 1][y + 1]) {
      cnt++;
    }

    if(x + 1 <= n && y - 1 >= 1 && !dp[x + 1][y - 1]) {
      cnt++;
    }

    int ss = x + y - 1;
    if(cnt == di[ss]) {
      cout << 0 << '\n';
      continue;
    }

    queue<pair<int, int>> qq;
    qq.push({x, y});
    dp[x][y] = false;
    di[x + y]--;

    // while(!qq.empty()) {
    //   auto u = qq.front();
    //   qq.pop();

    //   int xi = u.first, yi = u.second;
    //   int cnt = 0;
    //   if(xi - 1 >= 1 && yi + 1 <= m && !dp[xi - 1][yi + 1]) {
    //     dp[xi - 1][yi] = false;
    //     di[xi - 1 + yi]--;
    //     qq.push({xi - 1, yi});
    //   }

    //   if(xi + 1 <= n && yi - 1 >= 1 && !dp[xi + 1][yi - 1]) {
    //     dp[xi][yi - 1] = false;
    //     di[xi - 1 + yi]--;
    //     qq.push({xi, yi - 1});
    //   }
    // }

    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:184:9: warning: unused variable 'ok' [-Wunused-variable]
  184 |     int ok = 1;
      |         ^~

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