Submission #276327

#	Time	Username	Problem	Language	Result	Execution time	Memory
276327		AKaan37	Building Skyscrapers (CEOI19_skyscrapers)	C++17	54 / 100	1778 ms	98248 KiB

skyscrapers

//Bismillahirrahmanirrahim
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#include <bits/stdc++.h>

using namespace std;

typedef long long lo;
typedef pair< lo,lo > PII;
typedef pair< lo,PII > PIII;

#define fi first
#define se second
#define mp make_pair
#define endl "\n"
#define pb push_back
#define fio() ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
#define FOR for(int i=1;i<=n;i++)
#define mid ((start+end)/2)
#define ort ((bas+son)/2)

const lo inf = 1000000000000000000;
const lo KOK = 100000;
const lo LOG = 30;
const lo li = 200005;
const lo mod = 1000000007;

int n,m,b[li],a[li],k,flag,t,fa[li],vis[li],c[li],bos[li];
int cev;
PIII p[li];
string s;
map<PII,int> mpp;
vector<int> vv;
vector<PII> v[li];

inline int dsu(int x){
	if(x==fa[x])return x;
	return fa[x]=dsu(fa[x]);
}

inline void dfs(int node){
	set<PII> st;
	st.insert({a[node],b[node]});
	while(st.size()){
		auto it=st.begin();
		PII pa=*it;
		int node=mpp[pa];
		st.erase(it);
		if(vis[node])continue;
		vv.pb(node);
		vis[node]=1;
		for(int i=0;i<(int)v[node].size();i++){
			int go=v[node][i].se;
			//~ if(st.find({bos[go],{-c[go],go}})!=st.end())st.erase({bos[go],{-c[go],go}});
			bos[go]--;
			st.insert({a[go],b[go]});
		}
	}
}

int main(void){
	scanf("%d %d",&n,&t);
	FOR bos[i]=4;
	FOR fa[i]=i;
	FOR{
		int x,y;
		scanf("%d %d",&a[i],&b[i]);
		x=a[i];
		y=b[i];
		cev=0;
		p[i].fi=x;
		p[i].se.fi=y;
		p[i].se.se=i;
		if(mpp[{x-1,y}]){
			cev++;
		}
		if(mpp[{x+1,y}]){
			cev++;
		}
		if(mpp[{x,y-1}]){
			cev++;
		}
		if(mpp[{x,y+1}]){
			cev++;
		}
		c[i]=cev;
		mpp[{x,y}]=i;
	}
	mpp.clear();
	FOR{
		int x,y;
		x=a[i];
		y=b[i];
		if(mpp[{x-1,y}]){
			v[mpp[{x-1,y}]].pb({c[i],i});
			v[i].pb({c[mpp[{x-1,y}]],mpp[{x-1,y}]});
		}
		if(mpp[{x+1,y}]){
			v[mpp[{x+1,y}]].pb({c[i],i});
			v[i].pb({c[mpp[{x+1,y}]],mpp[{x+1,y}]});
		}
		if(mpp[{x,y-1}]){
			v[mpp[{x,y-1}]].pb({c[i],i});
			v[i].pb({c[mpp[{x,y-1}]],mpp[{x,y-1}]});
		}
		if(mpp[{x,y+1}]){
			v[mpp[{x,y+1}]].pb({c[i],i});
			v[i].pb({c[mpp[{x,y+1}]],mpp[{x,y+1}]});
		}
		if(mpp[{x+1,y+1}]){
			v[mpp[{x+1,y+1}]].pb({c[i],i});
			v[i].pb({c[mpp[{x+1,y+1}]],mpp[{x+1,y+1}]});
		}
		if(mpp[{x-1,y+1}]){
			v[mpp[{x-1,y+1}]].pb({c[i],i});
			v[i].pb({c[mpp[{x-1,y+1}]],mpp[{x-1,y+1}]});
		}
		if(mpp[{x-1,y-1}]){
			v[mpp[{x-1,y-1}]].pb({c[i],i});
			v[i].pb({c[mpp[{x-1,y-1}]],mpp[{x-1,y-1}]});
		}
		if(mpp[{x+1,y-1}]){
			v[mpp[{x+1,y-1}]].pb({c[i],i});
			v[i].pb({c[mpp[{x+1,y-1}]],mpp[{x+1,y-1}]});
		}
		mpp[{x,y}]=i;
	}
	int mx=-1;
	int ind=0;
	sort(p+1,p+n+1);
	ind=p[1].se.se;
	dfs(ind);
	FOR{
		if(vis[i]==0){printf("NO\n");return 0;}
	}
	printf("YES\n");
	
	for(int i=0;i<n;i++)printf("%d\n",vv[i]);
	return 0;
}

Compilation message (stderr)

skyscrapers.cpp: In function 'int main()':
skyscrapers.cpp:130:6: warning: unused variable 'mx' [-Wunused-variable]
  130 |  int mx=-1;
      |      ^~
skyscrapers.cpp:64:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   64 |  scanf("%d %d",&n,&t);
      |  ~~~~~^~~~~~~~~~~~~~~
skyscrapers.cpp:69:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   69 |   scanf("%d %d",&a[i],&b[i]);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 14 / 14
• Subtask 3: 12 / 12
• Subtask 4: 0 / 17
• Subtask 5: 20 / 20
• Subtask 6: 0 / 10
• Subtask 7: 0 / 19