Submission #613295

#	Time	Username	Problem	Language	Result	Execution time	Memory
613295		talant117408	Two Antennas (JOI19_antennas)	C++17	13 / 100	460 ms	350720 KiB

antennas

#include <bits/stdc++.h>
 
using namespace std;
 
typedef long long ll;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;

#define long                unsigned long 
#define pb                  push_back
#define mp                  make_pair
#define all(v)              (v).begin(),(v).end()
#define rall(v)             (v).rbegin(),(v).rend()
#define lb                  lower_bound
#define ub                  upper_bound
#define sz(v)               int((v).size())
#define do_not_disturb      ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define endl                '\n'
#define PI                  2*acos(0.0)

void solve(int test) {
    int n, q;
    cin >> n;
    vector <int> h(n), a(n), b(n);
    for (int i = 0; i < n; i++) {
        cin >> h[i] >> a[i] >> b[i];
    }
    if (n <= 2000) {
        int cost[n][n][20], lg[n + 1], left[n][n], right[n][n];
        lg[1] = 0;
        for (int i = 2; i <= n; i++) {
            lg[i] = lg[i / 2] + 1;
        }
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < n; j++) {
                right[i][j] = -1;
                left[i][j] = -1;
                for (int k = 0; k < 20; k++) {
                    cost[i][j][k] = -1;
                }
            }
        }
        for (int i = 0; i < n; i++) {
            for (int j = i + 1; j < n; j++) {
                if (max(a[i], a[j]) <= j - i && j - i <= min(b[i], b[j])) {
                    right[i][j] = abs(h[i] - h[j]);
                }
            }
        }
        for (int i = 0; i < n; i++) {
            for (int j = i - 1; j >= 0; j--) {
                right[j][i] = max(right[j][i], right[j + 1][i]);
            }
        }
        for (int i = 0; i < n; i++) {
            for (int j = i; j < n; j++) {
                cost[i][j][0] = right[i][j];              
            }
        }
        //~ for (int i = 0; i < n; i++) {
            //~ for (int j = i; j < n; j++) {
                //~ cout << cost[i][j][0] << ' ';
            //~ }
            //~ cout << endl;
        //~ }
        for (int l = 0; l < n; l++) {
            for (int j = 1; j < 20; j++) {
                for (int i = 0; i + (1 << j) <= n; i++) {
                    cost[l][i][j] = max(cost[l][i][j - 1], cost[l][i + (1 << (j - 1))][j - 1]);
                }
            }
        }
        int q;
        cin >> q;
        vector <pair <pii, int>> queries(q);
        for (int i = 0; i < q; i++) {
            cin >> queries[i].first.first >> queries[i].first.second;
            queries[i].second = i;
            int l = queries[i].first.first, r = queries[i].first.second;
            l--;r --;
            int j = lg[r - l + 1];
            //~ cout << l << ' ' << r << ' ' << j << endl;
            cout << max(cost[l][l][j], cost[l][r - (1 << j) + 1][j]) << endl;
        }
    }
}  

int main() {
    do_not_disturb
    
    int t = 1;
    //~ cin >> t;
    for (int i = 1; i <= t; i++) {
        solve(i);
    }
    
    return 0;
}

Compilation message (stderr)

antennas.cpp: In function 'void solve(int)':
antennas.cpp:29:40: warning: variable 'left' set but not used [-Wunused-but-set-variable]
   29 |         int cost[n][n][20], lg[n + 1], left[n][n], right[n][n];
      |                                        ^~~~
antennas.cpp:22:12: warning: unused variable 'q' [-Wunused-variable]
   22 |     int n, q;
      |            ^

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