Submission #547584

#	Time	Username	Problem	Language	Result	Execution time	Memory
547584		LittleFlowers__	Strange Device (APIO19_strange_device)	C++17	35 / 100	395 ms	53184 KiB

strange_device

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define in ({int x=0;int c=getchar(),n=0;for(;!isdigit(c);c=getchar()) n=(c=='-');for(;isdigit(c);c=getchar()) x=x*10+c-'0';n?-x:x;})
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int rnd(int l,int r){return l+rng()%(r-l+1);}
#define fasty ios_base::sync_with_stdio(false),cin.tie(nullptr);
#define task "A"
#define forinc(a,b,c) for(int a=b,_c=c;a<=_c;++a)
#define fordec(a,b,c) for(int a=b,_c=c;a>=_c;--a)
#define forv(a,b) for(auto&a:b)
#define fi first
#define se second
#define pb push_back
#define ii pair<int,int>
#define mt make_tuple
#define all(a) a.begin(),a.end()
#define reset(f, x) memset(f, x, sizeof(f))
#define bit(x,i) ((x>>(i-1))&1)
#define on(x,i) (x|(1ll<<(i-1)))
#define off(x,i) (x&~(1<<(i-1)))
main(){
    //freopen(task".inp","r",stdin);
    //freopen(task".out","w",stdout);
    int n=in,a=in,b=in,sz=a/__gcd(a,b+1)*b;
    vector<ii> tmp;
    forinc(i,1,n){
        int l=in,r=in;
        if(r-l+1>sz) return cout<<sz,0;
        l=l%sz; r=r%sz;
        if(l<=r) tmp.pb({l,r});
        else tmp.pb({l,sz-1}),tmp.pb({0,r});
    }
    sort(all(tmp));
    int ret=0;
    forinc(i,0,tmp.size()-1){
        int j=i,hold=tmp[i].se;
        while(j<tmp.size() && tmp[j].fi<=hold){
            hold=max(hold,tmp[j].se);
            j++;
        }
        ret+=hold-tmp[i].fi+1;
        i=j-1;
    }
    cout<<ret;
}

Compilation message (stderr)

strange_device.cpp:22:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   22 | main(){
      | ^~~~
strange_device.cpp: In function 'int main()':
strange_device.cpp:38:16: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |         while(j<tmp.size() && tmp[j].fi<=hold){
      |               ~^~~~~~~~~~~

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