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Submission #983285

# Submission time Handle Problem Language Result Execution time Memory
983285 2024-05-15T09:56:56 Z vjudge1 Strange Device (APIO19_strange_device) C++17
15 / 100
 236 ms 34252 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;
        }
    }
    cout << 1 / 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:72:15: warning: division by zero [-Wdiv-by-zero]
   72 |     cout << 1 / 0;
      |             ~~^~~
strange_device.cpp:73:8: warning: variable 'lf' set but not used [-Wunused-but-set-variable]
   73 |     ll lf[n + 2], rg[n + 2];
      |        ^~
strange_device.cpp:73:19: warning: variable 'rg' set but not used [-Wunused-but-set-variable]
   73 |     ll lf[n + 2], rg[n + 2];
      |                   ^~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 2396 KB Output is correct
2 Correct 35 ms 14600 KB Output is correct
3 Correct 59 ms 20152 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 1 ms 2396 KB Output is correct
9 Correct 7 ms 3404 KB Output is correct
10 Correct 1 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 2396 KB Output is correct
14 Correct 1 ms 2396 KB Output is correct
15 Correct 35 ms 9016 KB Output is correct
16 Correct 21 ms 8916 KB Output is correct
17 Correct 44 ms 13136 KB Output is correct
18 Correct 1 ms 2392 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 0 ms 2396 KB Output is correct
3 Correct 0 ms 2396 KB Output is correct
4 Correct 1 ms 2392 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 2396 KB Output is correct
2 Correct 108 ms 34252 KB Output is correct
3 Correct 145 ms 34016 KB Output is correct
4 Correct 108 ms 32592 KB Output is correct
5 Runtime error 180 ms 32084 KB Execution killed with signal 4
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 236 ms 32380 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 236 ms 32380 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 236 ms 32380 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 2392 KB Output is correct
2 Runtime error 28 ms 13392 KB Execution killed with signal 4
3 Halted 0 ms 0 KB -

Subtask #8
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 2396 KB Output is correct
2 Correct 35 ms 14600 KB Output is correct
3 Correct 59 ms 20152 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 1 ms 2396 KB Output is correct
9 Correct 7 ms 3404 KB Output is correct
10 Correct 1 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 2396 KB Output is correct
14 Correct 1 ms 2396 KB Output is correct
15 Correct 35 ms 9016 KB Output is correct
16 Correct 21 ms 8916 KB Output is correct
17 Correct 44 ms 13136 KB Output is correct
18 Correct 1 ms 2392 KB Output is correct
19 Correct 1 ms 2392 KB Output is correct
20 Correct 0 ms 2396 KB Output is correct
21 Correct 0 ms 2396 KB Output is correct
22 Correct 1 ms 2392 KB Output is correct
23 Correct 1 ms 2396 KB Output is correct
24 Correct 1 ms 2396 KB Output is correct
25 Correct 108 ms 34252 KB Output is correct
26 Correct 145 ms 34016 KB Output is correct
27 Correct 108 ms 32592 KB Output is correct
28 Runtime error 180 ms 32084 KB Execution killed with signal 4
29 Halted 0 ms 0 KB -