Submission #345300

#	Time	Username	Problem	Language	Result	Execution time	Memory
345300		Rakhmand	Hedgehog Daniyar and Algorithms (IZhO19_sortbooks)	C++14	100 / 100	2011 ms	109020 KiB

sortbooks

//
//  A.cpp
//  torelax
//
//  Created by Rakhman on 1/5/21.
//
 
#include <cstring>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <queue>
#include <cmath>
#include <cstdlib>
#include <ctime>
#include <cassert>
#include <iterator>
 
#define ios ios_base::sync_with_stdio(0), cout.tie(0), cin.tie(0);
#define S second
#define F first
#define pb push_back
#define nl '\n'
#define NL cout << '\n';
#define EX exit(0)
#define all(s) s.begin(), s.end()
#define no_answer {cout << "NO"; exit(0);}
#define FOR(i, start, finish, k) for(llong i = start; i <= finish; i += k)
 
const long long mxn = 1e6 + 110;
const long long mnn = 1e3 + 2;
const long long mod = 1e9 + 7;
const long long inf = 1e18;
const long long OO = 1e9 + 100;
 
typedef long long llong;
typedef unsigned long long ullong;
 
using namespace std;
 
int n, m, b[mxn], su[mxn], mx[mxn], pos[mxn];
int Q;
vector<int> rightq[mxn];

struct query{
    int l, r, x;
}q[mxn];

void divideandconquer(int L, int R){
    if(L == R) return ;
    int m = (L + R) / 2;
    vector<int> v;
    su[m + 1] = mx[m + 1] = 0;
    for(int i = m; i >= L; i--) {
        su[i] = max(su[i + 1], b[i]);
        mx[i] = mx[i + 1];
        
        while(v.size() > 0 && v.back() <= b[i]){
            if(b[i] > v.back()) mx[i] = max(mx[i], b[i] + v.back());
            v.pop_back();
        }
        v.push_back(b[i]);
    }
    int batkya = 0, mow = 0;
    vector<int> t;
    for(int i = m + 1; i <= R; i++){
        if(t.size() == 0 || t.back() < b[i]){
            t.push_back(b[i]);
        }
        if(batkya > b[i]) mow = max(mow, batkya + b[i]);
        batkya = max(batkya, b[i]);
        for(auto id : rightq[i]){
            int left = q[id].l, k = q[id].x;
            if(!(L <= left && left <= m)){
                continue;
            }
            if(pos[id] == 0 || max(mow, mx[left]) > k){
                pos[id] = 0;
                continue;
            }
            int lol = lower_bound(t.begin(), t.end(), su[left]) - t.begin() - 1;
            if(0 <= lol && lol < t.size()){
                if(t[lol] + su[left] > k){
                    pos[id] = 0;
                    continue;
                }
            }
        }
    }
    divideandconquer(L, m);
    divideandconquer(m + 1, R);
}

int main() {
    ios;
    cin >> n >> Q;
    for(int i = 1; i <= n; i++){
        cin >> b[i];
    }
    for(int i = 1; i <= Q; i++){
        cin >> q[i].l >> q[i].r >> q[i].x;
        rightq[q[i].r].push_back(i);
        pos[i] = 1;
    }
    divideandconquer(1, n);
    for(int i = 1; i <= Q; i++){
        cout << pos[i] << nl;
    }
}

Compilation message (stderr)

sortbooks.cpp: In function 'void divideandconquer(int, int)':
sortbooks.cpp:94:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   94 |             if(0 <= lol && lol < t.size()){
      |                            ~~~~^~~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 9 / 9
• Subtask 3: 13 / 13
• Subtask 4: 17 / 17
• Subtask 5: 30 / 30
• Subtask 6: 23 / 23