Submission #400047

#	Time	Username	Problem	Language	Result	Execution time	Memory
400047		teehandsome	Strange Device (APIO19_strange_device)	C++11	5 / 100	491 ms	30300 KiB

strange_device

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define endl '\n'
#define INF 1e9+7
#define all(x) x.begin(),x.end()
using namespace std;
using namespace __gnu_pbds;
using ll=long long;
using pii=pair<int,int>;
using ppi=pair<int,pii>;
using oset=tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update>;

template<typename T>
void _print(vector<T> x) {cerr<<"{"; for(auto e:x) cerr<<e<<","; cerr<<"}";}
void _print(pii x) {cerr<<"{"<<x.first<<","<<x.second<<"}";}
template<typename T>
void _print(T x) {cerr<<x;}

void dbg() {cerr<<endl;}
template<typename Head,typename... Tail>
void dbg(Head H,Tail... T) {
    _print(H);
    if(sizeof...(T)) cerr<<",";
    else cerr<<"\"]";
    dbg(T...);
}
#define debug(...) cerr<<"["<<#__VA_ARGS__<<"]:[\"",dbg(__VA_ARGS__)

//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

using pll=pair<ll,ll>;

int main () {
    ios::sync_with_stdio(false); cin.tie(0);
    ll n,a,b; cin>>n>>a>>b;
    vector<pll> seg;
    if(a&1) {
        for(int tt=0;tt<n;tt++) {
            ll l,r; cin>>l>>r;
            l%=a; r%=a;
            if(l<=r) seg.push_back({l,r});
            else {
                seg.push_back({0,r});
                seg.push_back({l,a-1});
            }
        }
        sort(all(seg));

        ll L=seg[0].first,R=seg[0].second;
        int len=seg.size();
        ll ans=0;

        for(int i=1;i<len;i++) {
            if(seg[i].first<=R) {
                R=max(R,seg[i].second);
            }
            else {
                ans+=(R-L)+1;
                L=seg[i].first;
                R=seg[i].second;
            }
        }
        ans+=(R-L)+1;
        cout<<ans<<endl;
    }
    else {
        for(int tt=0;tt<n;tt++) {
            ll l,r; cin>>l>>r;
            l=(l*2)%a,r=(r*2)%a;
            if(l<=r) seg.push_back({l,r});
            else {
                seg.push_back({0,r});
                if(l<=a-2) seg.push_back({l,a-2});
            }
        }
        sort(all(seg));
        ll L=seg[0].first,R=seg[0].second;
        ll ans=0;
        int len=seg.size();
        for(int i=1;i<len;i++) {
            if(seg[i].first<=R) {
                R=max(R,seg[i].second);
            }
            else {
                ans+=(R-L)/2+1;
                L=seg[i].first,R=seg[i].second;
            }
        }
        ans+=(R-L)/2+1;
        cout<<ans<<endl;
    }
}

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