Submission #423570

#	Time	Username	Problem	Language	Result	Execution time	Memory
423570		Kerim	Furniture (JOI20_furniture)	C++17	100 / 100	488 ms	15756 KiB

furniture

#include "bits/stdc++.h"
#define MAXN 100009
#define INF 1000000007
#define mp(x,y) make_pair(x,y)
#define all(v) v.begin(),v.end()
#define pb(x) push_back(x)
#define wr cout<<"----------------"<<endl;
#define ppb() pop_back()
#define tr(ii,c) for(__typeof((c).begin()) ii=(c).begin();ii!=(c).end();ii++)
#define ff first
#define ss second
#define my_little_dodge 46
#define debug(x)  cerr<< #x <<" = "<< x<<endl;
using namespace std;
 
typedef long long ll;
typedef pair<int,int> PII;
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
const int N=1002;
int vis[N][N],dgn[N+N],n,m;
stack<PII>st;
void upd(int x,int y){
	if(!vis[x][y]){
		dgn[x+y]--;
		vis[x][y]=1;
		st.push(mp(x,y));
	}
}
void check(int x,int y){
	if(vis[x][y] and vis[x+1][y-1]){
		upd(x,y-1);
		upd(x+1,y);
	}
}
int mark(int x,int y){
	if(vis[x][y])return 1;
	if(dgn[x+y]==1)return 0;
	upd(x,y);
	while(!st.empty()){
		int x=st.top().ff;
		int y=st.top().ss;
		st.pop();
		check(x-1,y+1);
		check(x,y);
	}
	return 1;
}
int main(){
    //~ freopen("file.in", "r", stdin);
    scanf("%d%d",&n,&m);
    for(int i=0;i<=n+1;i++)
		for(int j=0;j<=m+1;j++){
			if(!j or !i or i>n or j>m)vis[i][j]=1;
			else dgn[i+j]++;
		}
	for(int i=1;i<=n;i++)
		for(int j=1;j<=m;j++){
			int x;
			scanf("%d",&x);
			if(x)assert(mark(i,j));
		}
	int q;
	scanf("%d",&q); 
	while(q--){
		int x,y;
		scanf("%d%d",&x,&y);
		printf("%d\n",mark(x,y));
	}
	return 0;
}

Compilation message (stderr)

furniture.cpp: In function 'int main()':
furniture.cpp:51:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   51 |     scanf("%d%d",&n,&m);
      |     ~~~~~^~~~~~~~~~~~~~
furniture.cpp:60:9: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   60 |    scanf("%d",&x);
      |    ~~~~~^~~~~~~~~
furniture.cpp:64:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   64 |  scanf("%d",&q);
      |  ~~~~~^~~~~~~~~
furniture.cpp:67:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   67 |   scanf("%d%d",&x,&y);
      |   ~~~~~^~~~~~~~~~~~~~

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