Submission #1267505

#	Time	Username	Problem	Language	Result	Execution time	Memory
1267505		hoa208	Strange Device (APIO19_strange_device)	C++20	0 / 100	5092 ms	589824 KiB

strange_device

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define FOR(i, a, b) for (int i = (a), _b = (b); i <= _b; i++)
#define FORD(i, b, a) for (int i = (b), _a = (a); i >= _a; i--)
#define pa pair<ll, ll>
#define fi first
#define se second
#define bit(mask, j) ((mask >> j) & 1)
const   ll mod = 1e9 + 7;
const   ll INF = 1e18;
//--------------------------------------------------------------------


ll n, A, B;
set<ll> st;
void hbmt() {
    cin >> n >> A >> B;
    ll cnt = 0;
    // if(n == 1) {
    //     ll l, r;
    //     cin >> l >> r;
    //     ll bcnn = A*B / __gcd(A, B);

    // }
    ll res = A / __gcd(A, B + 1) * B;
    FOR(i, 1, n) {
        ll l, r;
        cin >> l >> r;
        ll x = l % res, y = r % res;
        // cout << x << ' ' << y << ' ' << res << '\n';
        if(r - l + 1 >= res) {
            cout << res;
            return;
        }
        if(x <= y) {
            FOR(j, x, y) st.insert(j);
        }
        else {
            FOR(j, 0, y) st.insert(j);
            FOR(j, x, res - 1) st.insert(j);
        }
    }
    cout << st.size();
}

int main() {
    
    ios_base::sync_with_stdio(0);
    cin.tie(0);cout.tie(0);

    #define NAME "hbmt"
    if(fopen(NAME".inp", "r")) {
        freopen(NAME".inp", "r", stdin);
        freopen(NAME".out", "w", stdout);
    }
    
    //int t;cin>>t;while(t--)
    hbmt();
    return 0;
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:54:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   54 |         freopen(NAME".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
strange_device.cpp:55:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   55 |         freopen(NAME".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• 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