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Submission #774769

# Submission time Handle Problem Language Result Execution time Memory
774769 2023-07-06T02:52:39 Z Magikarp4000 Radio Towers (IOI22_towers) C++17
0 / 100
 911 ms 8508 KB 
#include "towers.h"
#include <bits/stdc++.h>
using namespace std;
#define OPTM ios_base::sync_with_stdio(0); cin.tie(0);
#define INF int(1e9+7)
#define ln '\n' 
#define ll long long
#define ull unsigned long long
#define ui unsigned int
#define us unsigned short
#define FOR(i,s,n) for (int i = s; i < n; i++)
#define FORR(i,n,s) for (int i = n; i > s; i--)
#define FORX(u, arr) for (auto u : arr)
#define PB push_back
#define in(v,x) (v.find(x) != v.end())
#define F first
#define S second
#define PII pair<int, int>
#define PLL pair<ll, ll>
#define UM unordered_map
#define US unordered_set
#define PQ priority_queue
#define ALL(v) v.begin(), v.end()
const ll LLINF = 1e18+1;

struct Node {
    int ma,mi,pos;
};

const int MAXN = 1e5+5;
int n,l,r,d;
int h[MAXN], le[MAXN], ri[MAXN], p[MAXN];
bool done, z[MAXN];
Node st[MAXN*4+10];
set<int> s;

void update(int s, int tl, int tr, int idx, int val) {
    if (tl == tr) {
        st[s].ma = st[s].mi = val;
        st[s].pos = tl;
    }
    else {
        int tm = (tl+tr)/2;
        if (idx <= tm) update(s*2,tl,tm,idx,val);
        else update(s*2+1,tm+1,tr,idx,val);
        st[s].ma = max(st[s*2].ma, st[s*2+1].ma);
        st[s].pos = st[s*2].ma > st[s*2+1].ma ? st[s*2].pos : st[s*2+1].pos;
        st[s].mi = min(st[s*2].mi, st[s*2+1].mi);
    }
}

PII query(int s, int tl, int tr, int l, int r, int tp) {
    // tp is type of query
    // 0: range min
    // 1: index of range max
    if (l <= tl && r >= tr) {
        return tp == 1 ? make_pair(st[s].ma, st[s].pos) : make_pair(st[s].mi, -1);
    }
    else {
        int tm = (tl+tr)/2;
        PII cur = {INF,-1};
        if (tp == 1) cur = {-INF,-1};
        if (l <= tm) cur = query(s*2,tl,tm,l,r,tp);
        if (r > tm) {
            PII ncur = query(s*2+1,tm+1,tr,l,r,tp);
            if (tp == 0) {
                if (ncur.F < cur.F) cur = ncur;
            }
            else {
                if (ncur.F > cur.F) cur = ncur;
            }
        }
        return cur;
    }
}

void precalc() {
    FOR(i,0,n) update(1,0,n-1,i,h[i]);
    PQ<PII> pq;
    FOR(i,0,n) {
        while (!pq.empty() && -pq.top().F <= h[i]-d) {
            ri[pq.top().S] = i;
            pq.pop();
        }
        pq.push({-h[i],i});
    }
    while (!pq.empty()) {
        ri[pq.top().S] = n;
        pq.pop();
    }
    FORR(i,n-1,-1) {
        while (!pq.empty() && -pq.top().F <= h[i]-d) {
            le[pq.top().S] = i;
            pq.pop();
        }
        pq.push({-h[i],i});
    }
    while (!pq.empty()) {
        le[pq.top().S] = -1;
        pq.pop();
    }
    vector<PII> v;
    FOR(i,0,n) v.PB({h[i],i});
    int vn = v.size();
    sort(ALL(v));
    s.insert(-INF);
    s.insert(INF);
    FOR(i,0,vn) {
        int idx = v[i].S;
        auto it = s.lower_bound(idx);
        auto it1 = it;
        it1--;
        if (le[idx] > (*it1) && ri[idx] < (*it)) s.insert(idx);
    }
    FORX(u,s) {
        if (u == INF || u == -INF) continue;
        p[u+1]++;
        z[u] = 1;
    }
    FOR(i,1,n+1) p[i] += p[i-1];
    // FOR(i,0,n) cout << z[i] << " ";
    // cout << ln;
}

void init(int N, std::vector<int> H) {
    n = N;
    FOR(i,0,n) h[i] = H[i];
}

int max_towers(int L, int R, int D) {
    l = L, r = R, d = D;
    if (!done) {
        precalc();
        done = 1;
    }
    int res = p[r+1]-p[l];
    int a = *s.lower_bound(l);
    if (a > r) return 1;
    if (a > l+1) {
        int idx = query(1,0,n-1,l,a-1,1).S;
        if (idx > l) {
            int x = query(1,0,n-1,l,idx-1,0).F;
            if (x <= h[idx]-d) res++;
        }
    }
    auto it = s.upper_bound(r);
    it--;
    int b = *it;
    if (b < l) return 0;
    if (b < r-1) {
        int idx = query(1,0,n-1,b+1,r,1).S;
        if (idx < r) {
            int x = query(1,0,n-1,idx+1,r,0).F;
            if (x <= h[idx]-d) res++;
        }
    }
    return res;
}

Subtask #1
0 / 4.0

# Verdict Execution time Memory Grader output
1 Incorrect 364 ms 3936 KB 12th lines differ - on the 1st token, expected: '2', found: '1'
2 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 432 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 1 ms 464 KB Output is correct
5 Correct 1 ms 336 KB Output is correct
6 Correct 1 ms 464 KB Output is correct
7 Correct 1 ms 464 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 1 ms 336 KB Output is correct
11 Correct 1 ms 336 KB Output is correct
12 Incorrect 0 ms 208 KB 1st lines differ - on the 1st token, expected: '2', found: '1'
13 Halted 0 ms 0 KB -

Subtask #3
0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 432 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 1 ms 464 KB Output is correct
5 Correct 1 ms 336 KB Output is correct
6 Correct 1 ms 464 KB Output is correct
7 Correct 1 ms 464 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 1 ms 336 KB Output is correct
11 Correct 1 ms 336 KB Output is correct
12 Incorrect 0 ms 208 KB 1st lines differ - on the 1st token, expected: '2', found: '1'
13 Halted 0 ms 0 KB -

Subtask #4
0 / 14.0

# Verdict Execution time Memory Grader output
1 Correct 640 ms 7716 KB Output is correct
2 Correct 715 ms 7740 KB Output is correct
3 Correct 749 ms 7728 KB Output is correct
4 Correct 825 ms 8492 KB Output is correct
5 Correct 635 ms 8476 KB Output is correct
6 Correct 742 ms 8508 KB Output is correct
7 Correct 743 ms 8464 KB Output is correct
8 Correct 732 ms 7224 KB Output is correct
9 Correct 806 ms 7228 KB Output is correct
10 Correct 911 ms 6968 KB Output is correct
11 Correct 720 ms 7008 KB Output is correct
12 Incorrect 608 ms 7228 KB 170th lines differ - on the 1st token, expected: '2', found: '1'
13 Halted 0 ms 0 KB -

Subtask #5
0 / 17.0

# Verdict Execution time Memory Grader output
1 Incorrect 266 ms 2032 KB 2nd lines differ - on the 1st token, expected: '7063', found: '7197'
2 Halted 0 ms 0 KB -

Subtask #6
0 / 19.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 336 KB Output is correct
2 Correct 1 ms 432 KB Output is correct
3 Correct 1 ms 336 KB Output is correct
4 Correct 1 ms 464 KB Output is correct
5 Correct 1 ms 336 KB Output is correct
6 Correct 1 ms 464 KB Output is correct
7 Correct 1 ms 464 KB Output is correct
8 Correct 1 ms 336 KB Output is correct
9 Correct 1 ms 336 KB Output is correct
10 Correct 1 ms 336 KB Output is correct
11 Correct 1 ms 336 KB Output is correct
12 Incorrect 0 ms 208 KB 1st lines differ - on the 1st token, expected: '2', found: '1'
13 Halted 0 ms 0 KB -

Subtask #7
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 364 ms 3936 KB 12th lines differ - on the 1st token, expected: '2', found: '1'
2 Halted 0 ms 0 KB -