Submission #210207

#	Time	Username	Problem	Language	Result	Execution time	Memory
210207		tatyam	Strange Device (APIO19_strange_device)	C++17	100 / 100	775 ms	33756 KiB

strange_device

#include <bits/stdc++.h>
using namespace std;
using ull = unsigned long long;
#define rep(n) for(int i=0;i<n;++i)
#define all(i) begin(i),end(i)
#define Sort(a) sort(all(a))
#define Rev(a) reverse(all(a))



using u128 = __uint128_t;
signed main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    ull n, a, b;
    cin >> n >> a >> b;
    u128 mod = a / gcd(a, b + 1) * u128(b);
    vector<pair<ull, int>> query;
    rep(n){
        ull l, r;
        cin >> l >> r;
        if(r - l + 1 >= mod){
            cout << ull(mod) << endl;
            return 0;
        }
        l %= mod; r %= mod;
        r++;
        query.emplace_back(l, 1);
        query.emplace_back(r, -1);
        if(l > r){
            query.emplace_back(mod, -1);
            query.emplace_back(0, 1);
        }
    }
    Sort(query);
    Rev(query);
    ull at = 0, cnt = 0, ans = 0;
    while(query.size()){
        ull next = query.back().first;
        if(cnt) ans += next - at;
        at = next;
        while(query.size() && query.back().first == at){
            cnt += query.back().second;
            query.pop_back();
        }
    }
    cout << ans << endl;
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:4:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
 #define rep(n) for(int i=0;i<n;++i)
                            ~^~~~~~~~
 #define all(i) begin(i),end(i)
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 #define Sort(a) sort(all(a))
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 #define Rev(a) reverse(all(a))
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 ~                            
 
 ~                            
 
 ~                            
 using u128 = __uint128_t;
 ~~~~~~~~~~~~~~~~~~~~~~~~~~   
 signed main(){
 ~~~~~~~~~~~~~~~              
     cin.tie(nullptr);
     ~~~~~~~~~~~~~~~~~~       
     ios::sync_with_stdio(false);
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     ull n, a, b;
     ~~~~~~~~~~~~~            
     cin >> n >> a >> b;
     ~~~~~~~~~~~~~~~~~~~~     
     u128 mod = a / gcd(a, b + 1) * u128(b);
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     vector<pair<ull, int>> query;
     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
     rep(n){
     ~~~~~                    
strange_device.cpp:19:5: note: in expansion of macro 'rep'
     rep(n){
     ^~~

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