Submission #382962

#	Time	Username	Problem	Language	Result	Execution time	Memory
382962		abil	Strange Device (APIO19_strange_device)	C++14	0 / 100	5094 ms	524292 KiB

strange_device

#include <bits/stdc++.h>

#define SPEEDUP ios_base::sync_with_stdio(0); cin.tie(NULL); cout.tie(NULL);
#define fr first
#define sc second
#define pb push_back
#define mk make_pair
#define all(s) s.begin(),s.end()
#define int long long

using namespace std;

const int N = (1e6 + 12);
const int mod = (1e9 + 7);
const int inf = (1e18 + 7);

map<int,int > used;
int l[N], r[N];

main(){
    SPEEDUP;
    int n, A, B;
    cin >> n >> A >> B;
//    for(int i = 0; i <= 25; i++){
//        cout << i << " ";
//    }
//    cout << endl;
//    vector<int > vec;
//    for(int i = 0;i <= 25; i++){
//        cout << ((i + (i + B - 1) / B)) << " ";
//        vec.pb(((i + (i + B - 1) / B)));
//    }
//    cout << endl;
//    for(int i = 0;i <= 25; i++){
//        cout << (i % B) << " ";
//    }
//    cout << endl;
//    for(auto to : vec){
//        cout << to % A << " ";
//    }
//    cout << endl;
    for(int i = 1; i <= n; i++){
        cin >> l[i] >> r[i];
    }
    int ans = 0;
    int la = -1, ra = -1;
    for(int i = 1; i <= n; i++){
        if(la == -1){
            la = l[i], ra = r[i];
        }
        else{
            la = max(la, l[i]);
            ra = max(ra, r[i]);
        }
        ans += ra - la + 1;
        la = ra + 1;
    }
    int x;
    if(0 == (A % (B + 1ll))){
        if(inf / B >= (A / (B + 1ll))){
            x = B * (A / (B + 1ll));
        }
        else{
            cout << ans << endl;
            return 0;
        }
    }
    else{
        if(inf / A >= B){
            x = A * B;
        }
        else{
            cout << ans << endl;
            return 0;
        }
    }
//    set<pair<int,int >> st;
    ans = 0;
    for(int i = 1;i <= n; i++){
        if(x <= r[i] - l[i] + 1){
            cout << x << endl;
            return 0;
        }
        if(r[i] % x >= l[i] % x){
//            cout << i << " ! " << l[i] % x << " " << r[i] % x <<endl;
//            st.insert({l[i] % x, r[i] % x});
              for(int j = l[i] % x; j <= r[i] % x; j++){
                if(used[j]){
                    continue;
                }
                ans++;
                used[j] = 1;
              }
        }
        else{
//            cout << i << " ? " << 0 << " " << r[i] % x << endl;
//            cout << i << " ? " << l[i] % x << " " << x - 1 << endl;
//            st.insert({0, r[i] % x});
              for(int j = 0; j <= r[i] % x; j++){
                if(used[j]){
                    continue;
                }
                ans++;
                used[j] = 1;
              }
//            st.insert({l[i] % x, x - 1});
              for(int j = l[i] % x; j <= x - 1; j++){
                if(used[j]){
                    continue;
                }
                ans++;
                used[j] = 1;
              }
        }
    }
//    la = -1, ra = -1;
//    for(auto to : st){
//        if(la == -1){
//            la = to.fr, ra = to.sc;
//        }
//        else{
//            la = max(la, to.fr);
//            ra = max(ra, to.sc);
//        }
//        if(la <= ra){
//            ans += ra - la + 1;
//            la = ra + 1;
//        }
//    }
    cout << ans;
}

Compilation message (stderr)

strange_device.cpp:20:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   20 | main(){
      |      ^

• Subtask 1: 0 / 10
• Subtask 2: 0 / 5
• Subtask 3: 0 / 5
• Subtask 4: 0 / 5
• Subtask 5: 0 / 5
• Subtask 6: 0 / 20
• Subtask 7: 0 / 20
• Subtask 8: 0 / 30