oj.uz

Submission #440194

# Submission time Handle Problem Language Result Execution time Memory
440194 2021-07-01T17:24:28 Z leaked Election (BOI18_election) C++14
0 / 100
 49 ms 52868 KB 
#include <bits/stdc++.h>

#define vec vector
#define f first
#define s second
#define endl '\n'
#define pb push_back
#define sz(x) (int)x.size()

using namespace std;
typedef pair<int,int> pii;
const int N=5e5+1;
int lft[N],rgt[N],lwr[N];
vec<pii>toadd[N];
int ans[N];
vec<pii>qry[N];
int mn[N][20],mx[N][20];
int lvl[N];
int getmn(int l,int r){
    int x=lvl[r-l+1];
    return min(mn[l][x],mn[r-(1<<x)+1][x]);
}
int getmx(int l,int r){
    int x=lvl[r-l+1];
    return max(mx[l][x],mx[r-(1<<x)+1][x]);
}
signed main()
{
    ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    int n,q;
    cin>>n;
    vec<int>a(n);string s;
    vec<int>x(n);
    cin>>s;s.insert(s.begin(),'w');
    for(int i=1;i<=n;i++){
        a[i]=(i?a[i-1]:0)+(s[i]=='C'?1:-1);
       // mn[i][0]=mx[i][0]=a[i];
    }
    for(int i=1;i<=n;i++){
        x[i]=(i?a[i-1]:0);
        mn[i][0]=mx[i][0]=x[i];
    }
    for(int i=2;i<N;i++) lvl[i]=lvl[i/2]+1;
    for(int j=1;j<20;j++){
        for(int i=0;i+(1<<(j-1))<n;i++){
            mn[i][j]=min(mn[i][j-1],mn[i+(1<<(j-1))][j-1]);
            mx[i][j]=max(mx[i][j-1],mx[i+(1<<(j-1))][j-1]);
        }
    }
    vec<pii>vc;
    vc.pb({-2e9,-1});
    for(int i=0;i<=n;i++){
        while(sz(vc) && vc.back().f>a[i]) vc.pop_back();
        lft[i]=vc.back().s+1;
        vc.pb({a[i],i});
    }
    vc.clear();
    vc.pb({2e9,n+1});
    for(int i=n;i>=0;i--){
        while(sz(vc) && vc.back().f<a[i]) vc.pop_back();
        rgt[i]=vc.back().s-1;
        vc.pb({a[i],i});
    }
    vc.clear();
    {
        vc.pb({-2e9,-1});
        for(int i=0;i<=n;i++){
            while(sz(vc) && vc.back().f>a[i]) vc.pop_back();
            lwr[i]=vc.back().s;
            vc.pb({a[i],i});
        }
    }
    cin>>q;
    while(q--){
        int l,r;
        cin>>l>>r;
        int answ=0;
     //   map<int,int>mp1,mp2;
        vec<int>us1(n+1,0),us2(n+1,0);
        int bl=0;
         for(int i=l;i<=r;i++){
            bl+=(s[i]=='C'?1:-1);
            if(bl<0){
                bl++;
                us2[i]=1;
                answ++;
                assert(lwr[i]<(l-1));
            }
        }
        //cout<<"FIRST"<<answ<<endl;
        bl=0;
        int st1=0,st2=0;
        int j=r-1;
        for(int i=r;i>=l;i--){
            if(a[j]<a[i-1]) {j=i-1;}
             bl+=(s[i]=='C'?1:-1);
             if(us2[i]) bl++;
             if(bl<0){
                 bl++;
                 answ++;st2++;
              //   cout<<"YO "<<i<<endl;
             }
        }
        st1=a[j];
        for(int i=j+1;i<=r;i++){
            if(lwr[i]<l-1) st1--;
        }
        st1-=a[r];
        st1=max(st1,0);
        //cout<<st1<<' '<<st2<<endl;
        assert(st1==st2);
        cout<<answ<<endl;
        //cout<<answ<<endl;
    }
    return 0;
}

Subtask #1
0 / 28.0

# Verdict Execution time Memory Grader output
1 Runtime error 49 ms 52868 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #2
0 / 54.0

# Verdict Execution time Memory Grader output
1 Runtime error 49 ms 52868 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #3
0 / 18.0

# Verdict Execution time Memory Grader output
1 Runtime error 49 ms 52868 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -