oj.uz

Submission #759426

# Submission time Handle Problem Language Result Execution time Memory
759426 2023-06-16T09:33:05 Z Bula Election (BOI18_election) C++17
0 / 100
 26 ms 70740 KB 
#include<bits/stdc++.h>
using namespace std;

#define int long long
const int mod=1e9+7,N=5e5+1;
vector<int> pref(N),suf(N+1),t(4*N),t1(4*N),t2(4*N),t3(4*N);



int getans(int v,int tl,int tr,int l,int r){
	if(l>r) return -INT_MAX;
	if(l==tl && r==tr){
		return t[v];
	}
	int tm=(tl+tr)/2;
	return max(getans(v*2,tl,tm,l,min(r,tm)),getans(v*2+1,tm+1,tr,max(l,tm+1),r));
}

void build(int v,int tl,int tr){
	if(tl==tr){
		t[v]=pref[tl];
	}else{
		int tm=(tl+tr)/2;
		build(v*2,tl,tm);
		build(v*2+1,tm+1,tr);
		t[v]=max(t[v*2],t[v*2+1]);
	}
}
/////
int getans1(int v,int tl,int tr,int l,int r){
	if(l>r) return -INT_MAX;
	if(l==tl && r==tr){
		return t1[v];
	}
	int tm=(tl+tr)/2;
	return max(getans1(v*2,tl,tm,l,min(r,tm)),getans1(v*2+1,tm+1,tr,max(l,tm+1),r));
}

void build1(int v,int tl,int tr){
	if(tl==tr){
		t1[v]=suf[tl];
	}else{
		int tm=(tl+tr)/2;
		build1(v*2,tl,tm);
		build1(v*2+1,tm+1,tr);
		t1[v]=max(t1[v*2],t1[v*2+1]);
	}
}
////
int getans2(int v,int tl,int tr,int l,int r){
	if(l>r) return INT_MAX;
	if(l==tl && r==tr){
		return t2[v];
	}
	int tm=(tl+tr)/2;
	return min(getans2(v*2,tl,tm,l,min(r,tm)),getans2(v*2+1,tm+1,tr,max(l,tm+1),r));
}

void build2(int v,int tl,int tr){
	if(tl==tr){
		t2[v]=pref[tl];
	}else{
		int tm=(tl+tr)/2;
		build2(v*2,tl,tm);
		build2(v*2+1,tm+1,tr);
		t2[v]=min(t2[v*2],t2[v*2+1]);
	}
}
/////
int getans3(int v,int tl,int tr,int l,int r){
	if(l>r) return INT_MAX;
	if(l==tl && r==tr){
		return t3[v];
	}
	int tm=(tl+tr)/2;
	return min(getans3(v*2,tl,tm,l,min(r,tm)),getans3(v*2+1,tm+1,tr,max(l,tm+1),r));
}

void build3(int v,int tl,int tr){
	if(tl==tr){
		t3[v]=suf[tl];
	}else{
		int tm=(tl+tr)/2;
		build3(v*2,tl,tm);
		build3(v*2+1,tm+1,tr);
		t3[v]=min(t3[v*2],t3[v*2+1]);
	}
}

main(){
    ios::sync_with_stdio(0);
    cin.tie(0),cout.tie(0);
	int n;
	cin>>n;
	string s;
	cin>>s;
	vector<int> v(n+1);
	for(int i=1;i<=n;i++){
		if(s[i-1]=='T') v[i]=1;
		else v[i]=-1;
	}
	
	for(int i=1;i<=n;i++){
		pref[i]=pref[i-1]+v[i];
	}	
	for(int i=n;i>=1;i--){
		suf[i]=suf[i+1]+v[i];
	}
	build(1,1,n);
	build1(1,1,n);
	build2(1,1,n);
	build3(1,1,n);
	//for(int i=1;i<=n;i++) cout<<pref[i]<<" ";
	//cout<<endl;
	//for(int i=1;i<=n;i++) cout<<suf[i]<<" ";
	//cout<<endl;
	int q;
	cin>>q;
	for(int i=1;i<=q;i++){
		int l,r;
		cin>>l>>r;
		int ans=0;
		ans=max(ans,getans(1,1,n,l,r)-pref[l-1]);
        ans=max(ans,getans1(1,1,n,l,r)-suf[r+1]);
		ans=max(ans,getans2(1,1,n,l,r)-pref[l-1]);
		ans=max(ans,getans3(1,1,n,l,r)-suf[r+1]);
		cout<<ans<<endl;
	}
}

Compilation message

election.cpp:90:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   90 | main(){
      | ^~~~

Subtask #1
0 / 28.0

# Verdict Execution time Memory Grader output
1 Incorrect 26 ms 70740 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 54.0

# Verdict Execution time Memory Grader output
1 Incorrect 26 ms 70740 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Incorrect 26 ms 70740 KB Output isn't correct
2 Halted 0 ms 0 KB -