Submission #345496

#	Time	Username	Problem	Language	Result	Execution time	Memory
345496		Kerim	이상한 기계 (APIO19_strange_device)	C++17	100 / 100	768 ms	26628 KiB

strange_device

#include "bits/stdc++.h"
#define MAXN 100009
#define INF 1000000007
#define mp(x,y) make_pair(x,y)
#define all(v) v.begin(),v.end()
#define pb(x) push_back(x)
#define wr cout<<"----------------"<<endl;
#define ppb() pop_back()
#define tr(ii,c) for(__typeof((c).begin()) ii=(c).begin();ii!=(c).end();ii++)
#define ff first
#define ss second
#define my_little_dodge 46
#define debug(x)  cerr<< #x <<" = "<< x<<endl;
using namespace std;

typedef long long ll;
typedef pair<ll,ll> PII;
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}
const ll B=1e18+1;
int main(){
//	freopen("file.in","r",stdin);
	int n;
	scanf("%d",&n);
	ll a,b;
	scanf("%lld%lld",&a,&b);
	ll mod=a/__gcd(a,b+1);
	if(mod<=B/b)
		mod*=b;
	else
		mod=B;
	vector<PII>v;
	for(int i=1;i<=n;i++){
		ll l,r;
		scanf("%lld%lld",&l,&r);
		if(r-l+1>=mod){
			printf("%lld\n",mod);
			return 0;	
		}
		l%=mod;r%=mod;
		if(l<=r)
			v.pb(mp(l,r));
		else{
			v.pb(mp(l,mod-1));
			v.pb(mp(0,r));
		}
	}
	sort(all(v));
	PII as=mp(-1,-1);
	ll ans=0;
	tr(it,v){
		if(as.ss<it->ff){
			if(~as.ff)
				ans+=as.ss-as.ff+1;
			as=*it;
		}
		else
			umax(as.ss,it->ss);
	}
	printf("%lld\n",ans+as.ss-as.ff+1);
	return 0;
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:24:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   24 |  scanf("%d",&n);
      |  ~~~~~^~~~~~~~~
strange_device.cpp:26:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   26 |  scanf("%lld%lld",&a,&b);
      |  ~~~~~^~~~~~~~~~~~~~~~~~
strange_device.cpp:35:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   35 |   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