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Submission #983287

# Submission time Handle Problem Language Result Execution time Memory
983287 2024-05-15T09:57:24 Z vjudge1 Strange Device (APIO19_strange_device) C++17
15 / 100
 536 ms 190952 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());
            }
        }
    }
    cout << 1 / 0;
    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:121:15: warning: division by zero [-Wdiv-by-zero]
  121 |     cout << 1 / 0;
      |             ~~^~~
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 2392 KB Output is correct
2 Correct 35 ms 14536 KB Output is correct
3 Correct 57 ms 20056 KB Output is correct
4 Correct 2 ms 2904 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2652 KB Output is correct
8 Correct 2 ms 2396 KB Output is correct
9 Correct 7 ms 3420 KB Output is correct
10 Correct 0 ms 2396 KB Output is correct
11 Correct 1 ms 2396 KB Output is correct
12 Correct 1 ms 2396 KB Output is correct
13 Correct 1 ms 2392 KB Output is correct
14 Correct 1 ms 2648 KB Output is correct
15 Correct 34 ms 9128 KB Output is correct
16 Correct 22 ms 8796 KB Output is correct
17 Correct 44 ms 13112 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 2396 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 0 ms 2396 KB Output is correct

Subtask #3
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 106 ms 34380 KB Output is correct
3 Correct 132 ms 34260 KB Output is correct
4 Correct 112 ms 32748 KB Output is correct
5 Incorrect 359 ms 94292 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 2396 KB Output is correct
2 Runtime error 536 ms 190952 KB Execution killed with signal 4
3 Halted 0 ms 0 KB -

Subtask #5
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Runtime error 536 ms 190952 KB Execution killed with signal 4
3 Halted 0 ms 0 KB -

Subtask #6
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Runtime error 536 ms 190952 KB Execution killed with signal 4
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 48 ms 14416 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 2392 KB Output is correct
2 Correct 35 ms 14536 KB Output is correct
3 Correct 57 ms 20056 KB Output is correct
4 Correct 2 ms 2904 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2652 KB Output is correct
8 Correct 2 ms 2396 KB Output is correct
9 Correct 7 ms 3420 KB Output is correct
10 Correct 0 ms 2396 KB Output is correct
11 Correct 1 ms 2396 KB Output is correct
12 Correct 1 ms 2396 KB Output is correct
13 Correct 1 ms 2392 KB Output is correct
14 Correct 1 ms 2648 KB Output is correct
15 Correct 34 ms 9128 KB Output is correct
16 Correct 22 ms 8796 KB Output is correct
17 Correct 44 ms 13112 KB Output is correct
18 Correct 1 ms 2396 KB Output is correct
19 Correct 1 ms 2396 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 0 ms 2396 KB Output is correct
24 Correct 1 ms 2396 KB Output is correct
25 Correct 106 ms 34380 KB Output is correct
26 Correct 132 ms 34260 KB Output is correct
27 Correct 112 ms 32748 KB Output is correct
28 Incorrect 359 ms 94292 KB Output isn't correct
29 Halted 0 ms 0 KB -