Submission #516543

#	Time	Username	Problem	Language	Result	Execution time	Memory
516543		DJ035	Furniture (JOI20_furniture)	C++17	0 / 100	5085 ms	10412 KiB

furniture

# pragma GCC optimize ("O3")
# pragma GCC optimize ("Ofast")
# pragma GCC optimize ("unroll-loops")
#include <bits/stdc++.h>
#define MEM 1111
#define sanic ios_base::sync_with_stdio(0)
#define x first
#define y second
#define pf push_front
#define pb push_back
#define all(v) v.begin(), v.end()
#define sz size()
using namespace std;
typedef long long ll;
typedef pair<ll, ll> pi;
const ll MOD = 1e9+7;
const ll INF = 2e14+7;
ll mul(ll a, ll b){
    return ((a*b)%MOD+MOD)%MOD;
}
ll add(ll a, ll b){
    return ((a+b)%MOD+MOD)%MOD;
}

ll t,n,m,k;
ll a[MEM][MEM], v[MEM][MEM];
string s;
ll dx[2] = {1,0};
ll dy[2] = {0,1};
queue<pi> q;
ll bfs(){
    memset(v, 0, sizeof(v));
    pi fin={n-1, m-1};
    q.push({0,0});
    while(!q.empty()){
        pi cur = q.front();
        q.pop();
        if(cur==fin)
            return 1;
        //cout << "c " << cur.x << ' ' << cur.y << '\n';
        for(int i=0; i<2; i++){
            ll nx = cur.x+dx[i], ny = cur.y+dy[i];
            //cout <<'\n' << nx << ' ' << ny << ' ';
            if(nx>=n || ny>=m) continue;
            //cout << "p ";
            if(a[nx][ny]) continue;
            if(v[nx][ny]) continue;
            v[nx][ny] = 1;
            //cout << "p ";
            q.push({nx,ny});
        }
    }
    return 0;
}
signed main(){
    //sanic; cin.tie(0); cout.tie(0);
    scanf("%lld %lld ", &n, &m);
    for(int i=0; i<n; i++)
        for(int j=0; j<m; j++)
            scanf("%lld ", &a[i][j]);
    scanf("%lld ", &t);
    while(t--){
        ll q1,q2;
        scanf("%lld %lld ", &q1, &q2);
        if(a[q1-1][q2-1]){
            puts("0");
            continue;
        }
        a[q1-1][q2-1] = 1;
        ll f=bfs();
        if(f) puts("1");
        else {
            puts("0");
            a[q1-1][q2-1] = 0;
        }
        cout << '\n';
    }
}
/*
6
2 3
4 3
1 3
3 5
6 2
110011
*/

Compilation message (stderr)

furniture.cpp: In function 'int main()':
furniture.cpp:57:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   57 |     scanf("%lld %lld ", &n, &m);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~
furniture.cpp:60:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |             scanf("%lld ", &a[i][j]);
      |             ~~~~~^~~~~~~~~~~~~~~~~~~
furniture.cpp:61:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   61 |     scanf("%lld ", &t);
      |     ~~~~~^~~~~~~~~~~~~
furniture.cpp:64:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   64 |         scanf("%lld %lld ", &q1, &q2);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

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