oj.uz

Submission #302796

# Submission time Handle Problem Language Result Execution time Memory
302796 2020-09-19T08:30:49 Z MarcoMeijer Comparing Plants (IOI20_plants) C++14
5 / 100
 2444 ms 102624 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*2]=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*2,r+=n*2; 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;
    }

    htoi[END] = END;
    // calculate next up
    {
	    nxtUp[END][0] = END;
        segH.build();
        REV(i,0,n) {
            int x = htoi[i];
            segH.set(x,i);
            segH.set(x+n,i);
            int nxt = htoi[segH.get(x+1,x+k)];
            if(nxt < x) nxt += n;
            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,i);
            segH.set(x+n,i);
            int nxt = htoi[segH.get(x+1,x+k)];
            if(nxt < x) nxt += n;
            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(h[x] < h[y]) {
        int lb=0, ub=n-1;
        while(lb != ub) {
            int mid=(lb+ub)/2;
            if(getNextUp(x,mid)+k-1 > y) ub=mid;
            else lb=mid+1;
        }
        int i = getNextUp(x,lb);
        if(i != END && i+k-1 > y && h[i] <= h[y]) return -1;
        return 0;
    } else {
        int lb=0, ub=n-1;
        while(lb != ub) {
            int mid=(lb+ub)/2;
            if(getNextDo(x,mid)+k-1 > y) ub=mid;
            else lb=mid+1;
        }
        int i = getNextDo(x,lb);
        if(i != END && i+k-1 > y && h[i] >= h[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+n);
}

Subtask #1
5.0 / 5.0

# 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 25472 KB Output is correct
4 Correct 15 ms 25448 KB Output is correct
5 Correct 15 ms 25472 KB Output is correct
6 Correct 139 ms 28280 KB Output is correct
7 Correct 385 ms 35960 KB Output is correct
8 Correct 1053 ms 102504 KB Output is correct
9 Correct 1222 ms 102372 KB Output is correct
10 Correct 1520 ms 102504 KB Output is correct
11 Correct 1948 ms 102500 KB Output is correct
12 Correct 2238 ms 102624 KB Output is correct
13 Correct 2444 ms 102376 KB Output is correct
14 Correct 2293 ms 102380 KB Output is correct

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 25472 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 25472 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 16 ms 25472 KB Output is correct
2 Correct 15 ms 25472 KB Output is correct
3 Incorrect 287 ms 29096 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 16 ms 25472 KB Output is correct
3 Correct 16 ms 25472 KB Output is correct
4 Correct 15 ms 25472 KB Output is correct
5 Incorrect 15 ms 25472 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #6
0 / 15.0

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

Subtask #7
0 / 25.0

# 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 25472 KB Output is correct
4 Correct 15 ms 25448 KB Output is correct
5 Correct 15 ms 25472 KB Output is correct
6 Correct 139 ms 28280 KB Output is correct
7 Correct 385 ms 35960 KB Output is correct
8 Correct 1053 ms 102504 KB Output is correct
9 Correct 1222 ms 102372 KB Output is correct
10 Correct 1520 ms 102504 KB Output is correct
11 Correct 1948 ms 102500 KB Output is correct
12 Correct 2238 ms 102624 KB Output is correct
13 Correct 2444 ms 102376 KB Output is correct
14 Correct 2293 ms 102380 KB Output is correct
15 Correct 15 ms 25472 KB Output is correct
16 Correct 15 ms 25472 KB Output is correct
17 Correct 15 ms 25472 KB Output is correct
18 Incorrect 16 ms 25472 KB Output isn't correct
19 Halted 0 ms 0 KB -