Submission #1281005

#	Time	Username	Problem	Language	Result	Execution time	Memory
1281005		StefanSebez	Strange Device (APIO19_strange_device)	C++20	100 / 100	324 ms	17108 KiB

strange_device

#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define pb push_back
#define ll long long
#define ld long double
#define mp make_pair
const ll inf=1e18;
int main(){
    int n;ll A,B;scanf("%i%lld%lld",&n,&A,&B);
    ll T=A/(__gcd(A,B+1));
    if(T>inf/B+50){
        ll res=0;
        for(int i=1;i<=n;i++){
            ll l,r;scanf("%lld%lld",&l,&r);
            res+=r-l+1;
        }
        printf("%lld\n",res);
        return 0;
    }
    T*=B;
    ll res=0;
    vector<pair<ll,ll>>itv;
    for(int i=1;i<=n;i++){
        ll l,r;scanf("%lld%lld",&l,&r);
        ll d=r-l+1;
        l%=T;
        if(d>=T) itv.pb({0,T-1});
        else if(l+d-1<=T-1) itv.pb({l,l+d-1});
        else{
            itv.pb({l,T-1});
            d-=T-1-l+1;
            itv.pb({0,d-1});
        }
    }
    sort(itv.begin(),itv.end());
    ll prvi=0,maks=-1;
    for(ll i=0;i<itv.size();i++){
        if(itv[i].fi>maks){
            res+=maks-prvi+1;
            prvi=itv[i].fi;
        }
        maks=max(maks,itv[i].se);
    }
    res+=maks-prvi+1;
    printf("%lld\n",res);
    return 0;
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:11:23: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |     int n;ll A,B;scanf("%i%lld%lld",&n,&A,&B);
      |                  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~
strange_device.cpp:16:25: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   16 |             ll l,r;scanf("%lld%lld",&l,&r);
      |                    ~~~~~^~~~~~~~~~~~~~~~~~
strange_device.cpp:26:21: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |         ll l,r;scanf("%lld%lld",&l,&r);
      |                ~~~~~^~~~~~~~~~~~~~~~~~

• 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