oj.uz

Submission #302778

# Submission time Handle Problem Language Result Execution time Memory
302778 2020-09-19T07:50:45 Z MarcoMeijer Comparing Plants (IOI20_plants) C++14
0 / 100
 258 ms 28920 KB 
#include "plants.h"
#include <bits/stdc++.h>

using namespace std;

#define REP(a,b,c) for(int a=int(b); a<int(c); a++)
#define REV(a,b,c) for(int a=int(c-1); a>=int(b); a--)
#define RE(a,b) REP(a,0,b)
#define FOR(a,b) for(auto& a:b)
#define pb push_back
#define fi first
#define se second
#define all(a) a.begin(), a.end()

typedef long long ll;
typedef pair<int,int> ii;
typedef vector<int> vi;
typedef vector<ii> vii;

const int INF=1e9;
const int MX=4e5+100;

int n, k;
vi r;
int h[MX];
int htoi[MX];
int nxtUp[MX][20];
int nxtDo[MX][20];

int END;

struct Seg {
    ii SEG[MX*4]; int LAZY[MX*4];
    void build(const vi& f, int p=0, int l=0, int r=n-1) {
        LAZY[p] = 0;
        if(l == r) {
            SEG[p] = {f[l], l};
            return;
        }
        int m=(l+r)/2;
        build(f,p*2+1,l,m);
        build(f,p*2+2,m+1,r);
        SEG[p] = max(SEG[p*2+1], SEG[p*2+2]);
    }
    void add(int i, int j, int v, int lazy=0, int p=0, int l=0, int r=n-1) {
        LAZY[p] += lazy;
        SEG[p].fi += lazy;
        if(j < l || i > r) return;
        if(i <= l && j >= r) {
            SEG[p].fi += v;
            LAZY[p] += v;
            return;
        }
        int m=(l+r)/2;
        add(i,j,v,LAZY[p],p*2+1,l,m);
        add(i,j,v,LAZY[p],p*2+2,m+1,r);
        LAZY[p] = 0;
        SEG[p] = max(SEG[p*2+1], SEG[p*2+2]);
    }
    void addRound(int i, int j, int v) {
        if(i >= n) i-=n, j-=n;
        if(j < n) {
            add(i,j,v);
        } else {
            add(i,n-1,v);
            add(0,j-n,v);
        }
    }
} seg1, seg2;

struct SegMin {
    int SEG[MX*2];
    void build() {
        RE(i,n*2) SEG[i+n*2]=END;
        REV(i,1,n*2) SEG[i]=min(SEG[i*2],SEG[i*2+1]);
    }
    void set(int x, int v) {
        for(SEG[x+=n]=v; x>1; x/=2) SEG[x/2]=min(SEG[x],SEG[x^1]);
    }
    int get(int l, int r) {
        int ans=INF;
        for(l+=n,r+=n; l<r; l/=2, r/=2) {
            if(l&1) ans = min(ans,SEG[l++]);
            if(r&1) ans = min(ans,SEG[--r]);
        }
        return ans;
    }
} segH;

void init(int _k, vi _r) {
    k = _k; r = _r;
    n = r.size();
    END = n*2;

    seg1.build(r);
    seg2.build(vi(n,0));

    RE(i,n) {
        while(seg1.SEG[0].fi == k-1) {
            int x = seg1.SEG[0].se;
            seg1.add(x,x,-INF);
            seg2.add(x,x,1);
            seg2.addRound(x+1,x+k-1,-1);
        }

        int x = seg2.SEG[0].se;
        seg2.add(x,x,-INF);
        seg2.addRound(x+1,x+k-1,1);
        seg1.addRound(x+n-k+1,x+n-1,1);
        h[x] = h[x+n] = i;
        htoi[i] = x;
    }

    // calculate next up
    {
	    nxtUp[END][0] = END;
        segH.build();
        REV(i,0,n) {
            int x = htoi[i];
            segH.set(x,x);
            segH.set(x+n,x+n);
            int nxt = segH.get(x+1,x+k);
            nxtUp[x][0] = nxt;
            nxtUp[x+n][0] = min(END,nxt+n);
        }
    }
    
    // calculate next do
    {
	    nxtDo[END][0] = END;
        segH.build();
        REP(i,0,n) {
            int x = htoi[i];
            segH.set(x,x);
            segH.set(x+n,x+n);
            int nxt = segH.get(x+1,x+k);
            nxtDo[x][0] = nxt;
            nxtDo[x+n][0] = min(END,nxt+n);
        }
    }

    REP(j,1,20) {
        RE(i,n*2+1) {
            nxtDo[i][j] = nxtDo[nxtDo[i][j-1]][j-1];
            nxtUp[i][j] = nxtUp[nxtUp[i][j-1]][j-1];
        }
    }

    return;
}

int getNextUp(int i, int j) {
    RE(x,20) if(j&(1<<x)) i = nxtUp[i][x];
    return i;
}
int getNextDo(int i, int j) {
    RE(x,20) if(j&(1<<x)) i = nxtDo[i][x];
    return i;
}

int comp(int x, int y) {
    if(y < x) y += n;
    if(h[x] < h[y]) {
        int lb=1, ub=n-1;
        while(lb != ub) {
            int mid=(lb+ub)/2;
            if(getNextUp(x,mid) >= y) ub=mid;
            else lb=mid+1;
        }
        if(getNextUp(x,lb) == y) return -1;
        return 0;
    } else {
        int lb=1, ub=n-1;
        while(lb != ub) {
            int mid=(lb+ub)/2;
            if(getNextDo(x,mid) >= y) ub=mid;
            else lb=mid+1;
        }
        if(getNextDo(x,lb) == y) return 1;
        return 0;
    }
}
int compare_plants(int x, int y) {
    int res = comp(x,y);
    if(res != 0) return res;
    return -comp(y,x);
}

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 25472 KB Output is correct
2 Correct 16 ms 25472 KB Output is correct
3 Correct 15 ms 25472 KB Output is correct
4 Correct 15 ms 25600 KB Output is correct
5 Correct 15 ms 25472 KB Output is correct
6 Incorrect 144 ms 28280 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #2
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 25472 KB Output is correct
2 Correct 15 ms 25472 KB Output is correct
3 Correct 15 ms 25464 KB Output is correct
4 Incorrect 16 ms 25472 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #3
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 25472 KB Output is correct
2 Correct 15 ms 25472 KB Output is correct
3 Correct 15 ms 25464 KB Output is correct
4 Incorrect 16 ms 25472 KB Output isn't correct
5 Halted 0 ms 0 KB -

Subtask #4
0 / 17.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 25472 KB Output is correct
2 Correct 16 ms 25472 KB Output is correct
3 Incorrect 258 ms 28920 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #5
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 25472 KB Output is correct
2 Correct 15 ms 25472 KB Output is correct
3 Incorrect 15 ms 25472 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #6
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 15 ms 25472 KB Output is correct
2 Correct 16 ms 25408 KB Output is correct
3 Incorrect 16 ms 25472 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #7
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 16 ms 25472 KB Output is correct
2 Correct 16 ms 25472 KB Output is correct
3 Correct 15 ms 25472 KB Output is correct
4 Correct 15 ms 25600 KB Output is correct
5 Correct 15 ms 25472 KB Output is correct
6 Incorrect 144 ms 28280 KB Output isn't correct
7 Halted 0 ms 0 KB -