oj.uz

Submission #861439

# Submission time Handle Problem Language Result Execution time Memory
861439 2023-10-16T07:53:35 Z ReLice Election (BOI18_election) C++14
82 / 100
 56 ms 56320 KB 
#include <bits/stdc++.h>
#define ll long long
#define str string
#define ins insert
#define ld long double
#define pb push_back
#define pf push_front
#define pof pop_front()
#define pob pop_back()
#define lb lower_bound
#define ub upper_bound
#define endl "\n"
#define fr first
#define sc second
#define sz size()
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
#define bc back()
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
#define ordered_set tree<ll, null_type,less_equal<ll>, rb_tree_tag,tree_order_statistics_node_update>
void fre(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
void start(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
}
const ll inf=1e18+7;
const ll mod=998244353;
const ll N=2e5+7;
const ld eps=1e-9;
struct node{
	ll pref,suf,ans,sum;
	node operator +(node a){
		node b;
		b.sum=a.sum+sum;
		b.pref=max(pref,a.pref+sum);
		b.suf=max(a.suf,suf+a.sum);
		b.ans=max({0ll,sum+a.ans,a.sum+ans,pref+a.suf});
		return b;
	}
};
ll a[N];
vector <node> t(N*4);
void build(ll v,ll tl,ll tr){
	if(tl==tr){
		t[v].sum=a[tl];
		t[v].ans=t[v].pref=t[v].suf=max(a[tl],0ll);
		
		return;
	}
	ll tm=(tl+tr)/2;
	build(v*2,tl,tm);
	build(v*2+1,tm+1,tr);
	t[v]=t[v*2]+t[v*2+1];
}
node go(ll v,ll tl,ll tr,ll l,ll r){
	if(tl>r || tr<l)return {0ll,0ll,0ll,0ll};
	if(l<=tl && tr<=r){
		return t[v];
	}
	ll tm=(tl+tr)/2;
	node a=go(v*2,tl,tm,l,r),b=go(v*2+1,tm+1,tr,l,r);
	return a+b;
}
void solve(){
    ll i,q;
    ll n;
	cin>>n;
	str s;
	cin>>s;
	s=" "+s;
	for(i=1;i<=n;i++){
		if(s[i]=='C') a[i]=-1;
		else a[i]=1;
	}
	build(1,1,n);
	cin>>q;
	ll l,r;
	for(i=0;i<q;i++){
		cin>>l>>r;
		cout<<go(1,1,n,l,r).ans<<endl;
	}
}

signed main(){
    start();
    //freopen("input.txt","r",stdin);
    //freopen("output.txt","w",stdout);
    ll t=1;
    //cin>>t;
    while(t--) solve();
}
/*
100
1 50 69 33  544
2 18 71 14 25 91 45
 
 
 
*/

Compilation message

election.cpp: In function 'void fre(std::string)':
election.cpp:24:27: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 | void fre(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
      |                    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
election.cpp:24:64: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   24 | void fre(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
      |                                                         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
28.0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 25436 KB Output is correct
2 Correct 6 ms 25436 KB Output is correct
3 Correct 5 ms 25436 KB Output is correct
4 Correct 5 ms 25436 KB Output is correct
5 Correct 6 ms 25436 KB Output is correct

Subtask #2
54.0 / 54.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 25436 KB Output is correct
2 Correct 6 ms 25436 KB Output is correct
3 Correct 5 ms 25436 KB Output is correct
4 Correct 5 ms 25436 KB Output is correct
5 Correct 6 ms 25436 KB Output is correct
6 Correct 45 ms 27332 KB Output is correct
7 Correct 49 ms 27436 KB Output is correct
8 Correct 45 ms 27212 KB Output is correct
9 Correct 45 ms 27360 KB Output is correct
10 Correct 46 ms 27216 KB Output is correct
11 Correct 46 ms 27344 KB Output is correct
12 Correct 48 ms 27468 KB Output is correct
13 Correct 50 ms 27512 KB Output is correct
14 Correct 56 ms 27424 KB Output is correct
15 Correct 45 ms 27224 KB Output is correct

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 25436 KB Output is correct
2 Correct 6 ms 25436 KB Output is correct
3 Correct 5 ms 25436 KB Output is correct
4 Correct 5 ms 25436 KB Output is correct
5 Correct 6 ms 25436 KB Output is correct
6 Correct 45 ms 27332 KB Output is correct
7 Correct 49 ms 27436 KB Output is correct
8 Correct 45 ms 27212 KB Output is correct
9 Correct 45 ms 27360 KB Output is correct
10 Correct 46 ms 27216 KB Output is correct
11 Correct 46 ms 27344 KB Output is correct
12 Correct 48 ms 27468 KB Output is correct
13 Correct 50 ms 27512 KB Output is correct
14 Correct 56 ms 27424 KB Output is correct
15 Correct 45 ms 27224 KB Output is correct
16 Runtime error 28 ms 56320 KB Execution killed with signal 11
17 Halted 0 ms 0 KB -