Submission #370781

#	Time	Username	Problem	Language	Result	Execution time	Memory
370781		cpp219	Strange Device (APIO19_strange_device)	C++14	65 / 100	531 ms	31932 KiB

strange_device

#pragma GCC target ("avx2")
#pragma GCC optimization ("O3")
#pragma GCC optimization ("unroll-loops")

#include<bits/stdc++.h>
#define ll long long
#define ld long double
#define fs first
#define sc second
using namespace std;
typedef pair<ll,ll> LL;
const ll N = 1e6 + 3;
const ll inf = 1e9 + 7;
LL a[N];
ll n,A,B,q,total;
vector<LL> v;

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    #define task "tst"
    if (fopen(task".INP","r")){
        freopen(task".INP","r",stdin);
        //freopen(task".OUT","w",stdout);
    }
    cin>>n>>A>>B; q = A/__gcd(B + 1,A); total = q * B;
    for (ll i = 1;i <= n;i++){
        cin>>a[i].fs>>a[i].sc;
        a[i].fs %= total; a[i].sc %= total;
        if (a[i].fs <= a[i].sc) v.push_back(a[i]);
        else{
            v.push_back({0,a[i].sc}); v.push_back({a[i].fs,total - 1});
        }
    }
    sort(v.begin(),v.end());
    ll mx = -inf,ans = 0;
    for (auto i : v){
        if (i.sc <= mx) continue;
        if (i.fs > mx) ans += i.sc - i.fs + 1;
        else ans += max(0ll,i.sc - mx);
        mx = max(mx,i.sc);
    }
    cout<<ans;
}

Compilation message (stderr)

strange_device.cpp:2: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
    2 | #pragma GCC optimization ("O3")
      | 
strange_device.cpp:3: warning: ignoring #pragma GCC optimization [-Wunknown-pragmas]
    3 | #pragma GCC optimization ("unroll-loops")
      | 
strange_device.cpp: In function 'int main()':
strange_device.cpp:23:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   23 |         freopen(task".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

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