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Submission #983280

# Submission time Handle Problem Language Result Execution time Memory
983280 2024-05-15T09:55:25 Z vjudge1 Strange Device (APIO19_strange_device) C++17
15 / 100
 573 ms 122860 KB 
#include <time.h>
#include <cstdlib>
#include <stack>
#include <numeric>
#include <unordered_map>
#include <unordered_set>
#include <iomanip>
#include <map>
#include <set>
#include <iterator>
#include <deque>
#include <queue>
#include <sstream>
#include <array>
#include <string>
#include <tuple>
#include <chrono>
#include <cassert>
#include <cstdio>
#include <cstring>
#include <list>
#include <iostream>
#include <vector>
#include <cmath>
#include <algorithm>
#include <bitset>
#define ll long long
using namespace std;

ll n, A, B;
ll l[1000005], r[1000005], sum = 0;
set<pair<ll, ll>> st1, st;
deque<pair<ll, ll>> st2;
int main(){
    ios::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);
    cin >> n >> A >> B;
    for(int i = 1; i <= n; i++){
      cin >> l[i] >> r[i];
      sum += (r[i] - l[i] + 1);
    }
    if(sum <= 1e6){
      for(int i = 1; i <= n; i++){
          for(ll j = l[i]; j <= r[i]; j++){
              ll x = (j + j / B) % A, y = (j % B);
              st.insert({x, y});
          }
      }
      cout << int(st.size()) << "\n";
      return 0;
    }
    if(n == 1){
        ll x = (l[1] + l[1] / B) % A; 
        if(l[1] + B <= r[1]){
            ll num = l[1] + B;
            ll y = (num + num / B) % A;
            if(x == y){
                cout << B << "\n";
                return 0;
            }
            ll d = abs(x - y);
            ll ans = gcd(d, A);
            ll rg = l[1] + ans * B - 1;
            cout << min(r[1], rg) - l[1] + 1 << "\n";
            return 0;
        }
        else{
            cout << r[1] - l[1] + 1 << "\n";
            return 0;
        }
    }
    ll lf[n + 2], rg[n + 2];
    for(int i = 1; i <= n; i++){
        lf[i] = l[i];
        rg[i] = min(r[i], l[i] + A - 1);
        st1.insert({l[i], i});
        // st2.insert({rg[i], i});
    }
    ll ans = 0, mx = 0, mn = 0;
    bool f = 0;
    while(!st1.empty()){
        if(!f){
            auto it = st1.begin();
            mn = it->first;
            mx = r[it->second];
            f = 1;
            st1.erase(st1.begin());
            continue;
        }
        else{
            if(st1.begin()->first <= mx){
                auto it = st1.begin();
                mx = max(r[it->second], mx);
                st1.erase(st1.begin());
                continue;
            }
            else{
                ll res = A;
                if(res % 2 == 1) res *= 2;
                if(mx - mn + 1 >= res / 2){
                    cout << res / 2;
                    return 0;
                }
                ll l1 = (2 * mn) % A;
                ll r1 = (2 * mx) % A;
                if(l1 > r1){
                    st2.push_back({l1, A - (A % 2)});
                    st2.push_back({0, r1});
                }
                else{
                    st2.push_back({l1, r1});
                }
                auto it = st1.begin();
                mn = it->first;
                mx = r[it->second];
                f = 1;
                st1.erase(st1.begin());
            }
        }
    }
    ll res = A;
    if(res % 2 == 1) res *= 2;
    if(mx - mn + 1 >= res / 2){
        cout << res / 2;
        return 0;
    }
    ll l1 = (2 * mn) % A;
    ll r1 = (2 * mx) % A;
    if(l1 > r1){
        st2.push_back({l1, A - (A % 2)});
        st2.push_back({0, r1});
    }
    else st2.push_back({l1, r1});
    sort(st2.begin(), st2.end());
    f = 0;
    mn = 0, mx = 0;
    ans = 0;
    while(!st2.empty()){
        if(!f){
            f = 1;
            mn = st2.front().first;
            mx = st2.front().second;
            st2.pop_front();
            continue;
        }
        else{
            if(st2.front().first <= mx){
                mx = max(mx, st2.front().second);
                st2.pop_front();
                continue;
            }
            else{
                ans = (mx - mn) / 2;
                mn = st2.front().first;
                mn = st2.front().first;
                mx = st2.front().second;
                st2.pop_front();
            }
        }
    }
    ans += (mx - mn) / 2;
    cout << ans;
}

Compilation message

strange_device.cpp: In function 'int main()':
strange_device.cpp:72:8: warning: variable 'lf' set but not used [-Wunused-but-set-variable]
   72 |     ll lf[n + 2], rg[n + 2];
      |        ^~
strange_device.cpp:72:19: warning: variable 'rg' set but not used [-Wunused-but-set-variable]
   72 |     ll lf[n + 2], rg[n + 2];
      |                   ^~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 37 ms 14964 KB Output is correct
3 Correct 58 ms 20564 KB Output is correct
4 Correct 2 ms 2908 KB Output is correct
5 Correct 1 ms 2392 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2652 KB Output is correct
8 Correct 1 ms 2396 KB Output is correct
9 Correct 7 ms 3164 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 0 ms 2396 KB Output is correct
12 Correct 1 ms 2396 KB Output is correct
13 Correct 1 ms 2396 KB Output is correct
14 Correct 1 ms 2396 KB Output is correct
15 Correct 32 ms 9040 KB Output is correct
16 Correct 21 ms 9304 KB Output is correct
17 Correct 45 ms 15956 KB Output is correct
18 Correct 1 ms 2396 KB Output is correct

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2396 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct

Subtask #3
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2476 KB Output is correct
2 Correct 107 ms 34492 KB Output is correct
3 Correct 136 ms 34296 KB Output is correct
4 Correct 113 ms 32848 KB Output is correct
5 Incorrect 377 ms 119376 KB Output isn't correct
6 Halted 0 ms 0 KB -

Subtask #4
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Incorrect 573 ms 122860 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Incorrect 573 ms 122860 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Incorrect 573 ms 122860 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Incorrect 40 ms 18280 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #8
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 37 ms 14964 KB Output is correct
3 Correct 58 ms 20564 KB Output is correct
4 Correct 2 ms 2908 KB Output is correct
5 Correct 1 ms 2392 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2652 KB Output is correct
8 Correct 1 ms 2396 KB Output is correct
9 Correct 7 ms 3164 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 0 ms 2396 KB Output is correct
12 Correct 1 ms 2396 KB Output is correct
13 Correct 1 ms 2396 KB Output is correct
14 Correct 1 ms 2396 KB Output is correct
15 Correct 32 ms 9040 KB Output is correct
16 Correct 21 ms 9304 KB Output is correct
17 Correct 45 ms 15956 KB Output is correct
18 Correct 1 ms 2396 KB Output is correct
19 Correct 1 ms 2392 KB Output is correct
20 Correct 1 ms 2396 KB Output is correct
21 Correct 1 ms 2396 KB Output is correct
22 Correct 1 ms 2396 KB Output is correct
23 Correct 1 ms 2396 KB Output is correct
24 Correct 1 ms 2476 KB Output is correct
25 Correct 107 ms 34492 KB Output is correct
26 Correct 136 ms 34296 KB Output is correct
27 Correct 113 ms 32848 KB Output is correct
28 Incorrect 377 ms 119376 KB Output isn't correct
29 Halted 0 ms 0 KB -