Submission #203939

#	Time	Username	Problem	Language	Result	Execution time	Memory
203939		Rakhmand	Two Antennas (JOI19_antennas)	C++14	0 / 100	469 ms	31864 KiB

antennas

//
//  ROIGold.cpp
//  Main calisma
//
//  Created by Rakhman on 05/02/2019.
//  Copyright © 2019 Rakhman. All rights reserved.
//
 
#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 FOR(i, start, finish, k) for(llong i = start; i <= finish; i += k)
 
const long long MXN = 2e5 + 200;
const long long N = 2e5 + 200;
const long long MNN = 5e3 + 100;
const long long MOD = 1e9 + 7;
const long long INF = 1e18;
const long long OO = 1e9 + 500;
 
typedef long long llong;
typedef unsigned long long ullong;
 
using namespace std;

void gettxt(bool yes){
    if(yes == 1){
        freopen("problem.in", "r", stdin);
        freopen("problem.out", "w", stdout);
    }else{
        freopen("/Users/rakhmanabdirashov/Desktop/folder/Programming/Road2Master/Road2Master/input.txt", "r", stdin);
    }
}
 
int n, Q, mx[MXN * 4], d[MXN * 4], mod[MXN * 4], ans[MXN];
pair<int, int> q[MXN];
vector<int> st[MXN], en[MXN];
vector<int> ranges[MXN];

struct antenna{
    int a, b, h;
}a[MXN];

void clearTree(){
    for(int i = 1; i < MXN * 4; i++){
        d[i] = -1;
        mx[i] = 0;
        mod[i] = OO;
    }
}

void push(int v){
    if(mod[v] != OO){
        mod[v + v] = min(mod[v + v], mod[v]);
        mod[v + v + 1] = min(mod[v + v + 1], mod[v]);
    }
    d[v] = max(d[v], mx[v] - mod[v]);
    mod[v] = OO;
}

void updating(int v){
    mx[v] = max(mx[v + v], mx[v + 1 + v]);
    d[v] = max(d[v + v], d[v + v + 1]);
}

void upd(int v, int tl, int tr, int pos, int x){
    push(v);
    if(tl == tr){
        mx[v] = x;
        return ;
    }
    int tm = (tl + tr) / 2;
    if(pos <= tm){
        upd(v + v, tl, tm, pos, x);
    }else{
        upd(v + v + 1, tm + 1, tr, pos, x);
    }
    updating(v);
}

void segupd(int v, int tl, int tr, int l, int r, int x){
    push(v);
    if(l <= tl && tr <= r){
        mod[v] = x;
        push(v);
        return ;
    }
    if(r < tl || tr < l){
        return ;
    }
    int tm = (tl + tr) / 2;
    segupd(v + v, tl, tm, l, r, x);
    segupd(v + v + 1, tm + 1, tr, l, r, x);
    updating(v);
}

int get(int v, int tl, int tr, int l, int r){
    push(v);
    if(l <= tl && tr <= r){
        return d[v];
    }
    if(r < tl || tr < l){
        return -1;
    }
    int tm = (tl + tr) / 2;
    return max(get(v + v, tl, tm, l, r), get(v + v + 1, tm + 1, tr, l, r));
    
}

void solve(){
    clearTree();
    for(int i = 1; i <= n; i++){
        ranges[i].clear();
        st[i].clear();
        en[i].clear();
    }
    for(int i = 1; i <= Q; i++){
        ranges[q[i].S].push_back(i);
    }
    for(int i = 1; i <= n; i++){
        if(i + a[i].a <= n){
            st[i + a[i].a].push_back(i);
        }
        if(i + a[i].b <= n){
            en[i + a[i].b].push_back(i);
        }
        for(auto it : st[i]){
            upd(1, 1, n, it, a[it].h);
        }
        if(i - a[i].a > 0){
            int right = i - a[i].a, left = max(1, i - a[i].b);
            segupd(1, 1, n, left, right, a[i].h);
        }
        for(auto i : ranges[i]){
            ans[i] = max(get(1, 1, n, q[i].F, q[i].S), ans[i]);
        }
        for(auto it : en[i]){
            upd(1, 1, n, it, 0);
        }
    }
}

int main () {
    ios;
    //gettxt(0);
    cin >> n;
    for(int i = 1; i <= n; i++){
        cin >> a[i].h >> a[i].a >> a[i].b;
    }
    cin >> Q;
    for(int i = 1; i <= Q; i++){
        ans[i] = -1;
        cin >> q[i].F >> q[i].S;
    }
    solve();
    reverse(a + 1, a + n + 1);
    for(int i = 1; i <= Q; i++){
        q[i] = {n - q[i].S + 1, n - q[i].F + 1};
    }
    solve();
    for(int i = 1; i <= Q; i++){
        cout << ans[i] << nl;
    }
    return 0;
}

Compilation message (stderr)

antennas.cpp: In function 'void gettxt(bool)':
antennas.cpp:56:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
         freopen("problem.in", "r", stdin);
         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
antennas.cpp:57:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
         freopen("problem.out", "w", stdout);
         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
antennas.cpp:59:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
         freopen("/Users/rakhmanabdirashov/Desktop/folder/Programming/Road2Master/Road2Master/input.txt", "r", stdin);
         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 2
• Subtask 2: 0 / 11
• Subtask 3: 0 / 22
• Subtask 4: 0 / 65