Submission #487750

#	Time	Username	Problem	Language	Result	Execution time	Memory
487750		Koosha_mv	Jousting tournament (IOI12_tournament)	C++14	100 / 100	97 ms	24984 KiB

tournament

#include <bits/stdc++.h>
using namespace std;
#define erorp(x) cout<<#x<<"={"<<(x.F)<<" , "<<x.S<<"}"<<endl
#define print(v,r) f(i,0,r) cout<<v[i]<<" "; cout<<endl
#define eror(x) cout<<#x<<'='<<(x)<<endl
#define f_(i,a,b) for(int i=a;i>=b;i--)
#define f(i,a,b) for(int i=a;i<b;i++)
#define nb(x) __builtin_popcount(x)
#define maxm(a,b) a=max(a,b)
#define minm(a,b) a=min(a,b)
#define Add(x,y) x=(x+y)%mod
#define lst(x) x[x.size()-1]
#define sz(x) int(x.size())
#define mp make_pair
#define ll long long
#define pb push_back
#define S second
#define F first

const int N=2e5+99;

int n,m,Rank,ans,max_ans,id[N],a[N],s[N],t[N],vl[N],vr[N],fa[N],h[N],seg[N],NN,C,R,K[N],S[N],E[N];
vector<int> g[N];

int Fen[N];
void update(int x,int val) { x++; while(x<N)  {  Fen[x]+=val;  x+=(x&-x);  } }
int query(int x) {  x++; int res=0;  while(x>0)  { res+=Fen[x]; x-=(x&-x);  } return res; } 

void build(){
	f(i,0,n){
		seg[i+n]=a[i];
	}
	f_(i,n-1,1){
		seg[i]=max(seg[i*2+0],seg[i*2+1]);
	}
}
int Get(int l,int r){
	int ans=0;
	for (l += n, r += n; l < r; l >>= 1, r >>= 1) {
		if (l&1) maxm(ans,seg[l++]);
		if (r&1) maxm(ans,seg[--r]);
	}
	return ans;
}
int find(int x){
	int l=-1,r=n;
	while(l+1<r){
		int mid=(l+r)/2;
		if(query(mid)<=x) l=mid;
		else r=mid;
	}
	return r;
}
void dfs(int x){
	fa[x]=x;
	vl[x]=N,vr[x]=0;
	f(i,0,g[x].size()){
		h[g[x][i]]=h[x]+1;
		dfs(g[x][i]);
		minm(vl[x],vl[g[x][i]]);
		maxm(vr[x],vr[g[x][i]]);
		if(h[fa[g[x][i]]]>h[fa[x]]){
			fa[x]=fa[g[x][i]];
		}
	}
	if(x<n){
		vl[x]=x;
		vr[x]=x;
	}
	//cout<<x<<" "<<fa[x]<<" "<<vl[x]<<" "<<vr[x]<<endl;
	//eror(Get(vl[x],vr[x]));
	if(Get(vl[x],vr[x])<Rank && h[fa[x]]-h[x]+1>max_ans){
		//eror(x);
		ans=fa[x];
		max_ans=h[fa[x]]-h[x]+1;
	}
}
void make_tree(){
	f(i,0,n){
		id[i]=i;
		update(i,1);
	}
	f(i,0,m){
		vector<int> v;
		int x,len=t[i]-s[i]+1;
		f(T,0,len){
			x=find(s[i]);
			update(x,-1);
			g[n+i].pb(id[x]);
			//cout<<n+i<<" "<<id[x]<<endl;
		}
		id[x]=n+i;
		update(x,1);
	}
}
int GetBestPosition(int N, int C, int R, int *K, int *S, int *E){
	n=N,m=C,Rank=R;	
	f(i,0,n-1) a[i]=K[i];
	f(i,0,C){
		s[i]=S[i];
		t[i]=E[i];
	}
	build();
	make_tree();
	dfs(n+m-1);
	//eror(max_ans);
	return ans;
}
/*
int main(){
	cin>>NN>>C>>R;
	f(i,0,NN-1) cin>>K[i];
	f(i,0,C){
		cin>>S[i]>>E[i];
	}
	cout<<GetBestPosition(NN,C,R,K,S,E);
}
*/
/*
5 3 3
1 0 2 4
1 3
0 1
0 1

5 3 2
1 0 3 4
1 3
0 1
0 1

1 0 0
*/

Compilation message (stderr)

tournament.cpp: In function 'void dfs(int)':
tournament.cpp:7:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    7 | #define f(i,a,b) for(int i=a;i<b;i++)
......
   57 |  f(i,0,g[x].size()){
      |    ~~~~~~~~~~~~~~~             
tournament.cpp:57:2: note: in expansion of macro 'f'
   57 |  f(i,0,g[x].size()){
      |  ^
tournament.cpp: In function 'void make_tree()':
tournament.cpp:26:31: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
   26 | void update(int x,int val) { x++; while(x<N)  {  Fen[x]+=val;  x+=(x&-x);  } }
      |                              ~^~
tournament.cpp:85:7: note: 'x' was declared here
   85 |   int x,len=t[i]-s[i]+1;
      |       ^

• Subtask 1: 17 / 17
• Subtask 2: 32 / 32
• Subtask 3: 51 / 51