oj.uz

Submission #173609

# Submission time Handle Problem Language Result Execution time Memory
173609 2020-01-04T17:10:45 Z nikolapesic2802 Election (BOI18_election) C++14
82 / 100
 3000 ms 9820 KB 
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/rope>

#define ll long long
#define pb push_back
#define sz(x) (int)(x).size()
#define mp make_pair
#define f first
#define s second
#define all(x) x.begin(), x.end()
#define D(x) cerr << #x << " is " << (x) << "\n";

using namespace std;
using namespace __gnu_pbds;
using namespace __gnu_cxx;

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
template<class T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update>; ///find_by_order(),order_of_key()
template<class T1, class T2> ostream& operator<<(ostream& os, const pair<T1,T2>& a) { os << '{' << a.f << ", " << a.s << '}'; return os; }
template<class T> ostream& operator<<(ostream& os, const vector<T>& a){os << '{';for(int i=0;i<sz(a);i++){if(i>0&&i<sz(a))os << ", ";os << a[i];}os<<'}';return os;}
template<class T> ostream& operator<<(ostream& os, const deque<T>& a){os << '{';for(int i=0;i<sz(a);i++){if(i>0&&i<sz(a))os << ", ";os << a[i];}os<<'}';return os;}
template<class T> ostream& operator<<(ostream& os, const set<T>& a) {os << '{';int i=0;for(auto p:a){if(i>0&&i<sz(a))os << ", ";os << p;i++;}os << '}';return os;}
template<class T> ostream& operator<<(ostream& os, const set<T,greater<T> >& a) {os << '{';int i=0;for(auto p:a){if(i>0&&i<sz(a))os << ", ";os << p;i++;}os << '}';return os;}
template<class T> ostream& operator<<(ostream& os, const multiset<T>& a) {os << '{';int i=0;for(auto p:a){if(i>0&&i<sz(a))os << ", ";os << p;i++;}os << '}';return os;}
template<class T> ostream& operator<<(ostream& os, const multiset<T,greater<T> >& a) {os << '{';int i=0;for(auto p:a){if(i>0&&i<sz(a))os << ", ";os << p;i++;}os << '}';return os;}
template<class T1,class T2> ostream& operator<<(ostream& os, const map<T1,T2>& a) {os << '{';int i=0;for(auto p:a){if(i>0&&i<sz(a))os << ", ";os << p;i++;}os << '}';return os;}

const int N=5e5+1,L=300,M=N/L;
string s;
int uzimam[M][L+1],sum[M][L+1],mn[M][L+1],delta[M][L+1];
int cnt[M];
void init(){
    for(int o=0;o<M;o++){
        int l=o*L,r=(o+1)*L-1;
        //printf("%i-%i!\n",l,r);
        for(int i=l;i<=r;i++)
            if(s[i]=='T')
                cnt[o]++;
        int m=0,d=0;
        for(int i=r;i>=l;i--){
            if(s[i]=='T')
                d--;
            else
                d++;
            m=min(m,d);
        }
        for(int i=cnt[o];i<=L;i++){
            sum[o][i]=i+L-2*cnt[o];
            mn[o][i]=m;
            delta[o][i]=d;
        }
        for(int i=0;i<cnt[o];i++){
            vector<bool> uzet(L);
            int tr=i,cntt=0;
            for(int j=l;j<=r;j++){
                if(s[j]=='T')
                    tr--;
                else
                    tr++;
                if(tr<0)
                    uzet[j-l]=1,tr++,cntt++;
            }
            uzimam[o][i]=cntt;
            sum[o][i]=tr;
            m=0,d=0;
            for(int j=r;j>=l;j--){
                if(s[j]=='T'){
                    if(!uzet[j-l])
                        d--;
                }
                else
                    d++;
                m=min(m,d);
            }
            mn[o][i]=m;
            delta[o][i]=d;
        }
        /*for(int i=0;i<=L;i++)
            printf("%i %i: uzimam: %i sum: %i mn: %i delta: %i\n",o,i,uzimam[o][i],sum[o][i],mn[o][i],delta[o][i]);*/
    }
}
vector<int> vals(M);
int calc(int l,int r){
    int le=l/L,ri=r/L;
    //printf("%i %i  %i %i\n",l,r,le,ri);
    if(le==ri){
        vector<bool> uzet(L);
        int tr=0,ans=0;
        for(int i=l;i<=r;i++){
            if(s[i]=='T')
                tr--;
            else
                tr++;
            if(tr<0)
                ans++,tr++,uzet[i-l]=1;
        }
        tr=0;
        for(int i=r;i>=l;i--){
            if(s[i]=='T'){
                if(!uzet[i-l])
                    tr--;
            }
            else
                tr++;
            if(tr<0)
                tr++,ans++;
        }
        return ans;
    }
    vector<bool> uzetL(L),uzetR(L);
    int tr=0,ans=0;
    for(int i=l;i<(le+1)*L;i++){
        if(s[i]=='T')
            tr--;
        else
            tr++;
        if(tr<0)
            ans++,tr++,uzetL[i-l]=1;
    }
    for(int i=le+1;i<ri;i++){
        vals[i]=min(L,tr);
        if(tr>=L){
            tr+=L-2*cnt[i];
            continue;
        }
        ans+=uzimam[i][tr];
        tr=sum[i][tr];
    }
    for(int i=ri*L;i<=r;i++){
        if(s[i]=='T')
            tr--;
        else
            tr++;
        if(tr<0)
            ans++,tr++,uzetR[r-i]=1;
    }
    tr=0;
    for(int i=r;i>=ri*L;i--){
        if(s[i]=='T'){
            if(!uzetR[r-i])
                tr--;
        }
        else
            tr++;
        if(tr<0)
            ans++,tr++;
    }
    for(int i=ri-1;i>le;i--){
        int d=-mn[i][vals[i]]-tr;
        if(d>0){
            ans+=d;
            tr+=d;
        }
        tr+=delta[i][vals[i]];
    }
    for(int i=(le+1)*L-1;i>=l;i--){
        if(s[i]=='T'){
            if(!uzetL[i-l])
                tr--;
        }
        else
            tr++;
        if(tr<0)
            ans++,tr++;
    }
    return ans;
}
int main()
{
	//freopen("in.txt","r",stdin);
	//freopen("out.txt","w",stdout);
	int n,q,l,r;
	cin >> n >> s >> q;
	while(s.size()!=N)
        s+='C';
    init();
    while(q--){
        cin >> l >> r;
        cout << calc(l-1,r-1) << endl;
    }
    return 0;
}

Subtask #1
28.0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 26 ms 6832 KB Output is correct
2 Correct 26 ms 6832 KB Output is correct
3 Correct 25 ms 6832 KB Output is correct
4 Correct 26 ms 6960 KB Output is correct
5 Correct 23 ms 6832 KB Output is correct

Subtask #2
54.0 / 54.0

# Verdict Execution time Memory Grader output
1 Correct 26 ms 6832 KB Output is correct
2 Correct 26 ms 6832 KB Output is correct
3 Correct 25 ms 6832 KB Output is correct
4 Correct 26 ms 6960 KB Output is correct
5 Correct 23 ms 6832 KB Output is correct
6 Correct 670 ms 7464 KB Output is correct
7 Correct 770 ms 7408 KB Output is correct
8 Correct 671 ms 7472 KB Output is correct
9 Correct 515 ms 7504 KB Output is correct
10 Correct 619 ms 7464 KB Output is correct
11 Correct 685 ms 7776 KB Output is correct
12 Correct 444 ms 7600 KB Output is correct
13 Correct 473 ms 7488 KB Output is correct
14 Correct 428 ms 7472 KB Output is correct
15 Correct 404 ms 7344 KB Output is correct

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 26 ms 6832 KB Output is correct
2 Correct 26 ms 6832 KB Output is correct
3 Correct 25 ms 6832 KB Output is correct
4 Correct 26 ms 6960 KB Output is correct
5 Correct 23 ms 6832 KB Output is correct
6 Correct 670 ms 7464 KB Output is correct
7 Correct 770 ms 7408 KB Output is correct
8 Correct 671 ms 7472 KB Output is correct
9 Correct 515 ms 7504 KB Output is correct
10 Correct 619 ms 7464 KB Output is correct
11 Correct 685 ms 7776 KB Output is correct
12 Correct 444 ms 7600 KB Output is correct
13 Correct 473 ms 7488 KB Output is correct
14 Correct 428 ms 7472 KB Output is correct
15 Correct 404 ms 7344 KB Output is correct
16 Execution timed out 3029 ms 9820 KB Time limit exceeded
17 Halted 0 ms 0 KB -