Submission #124423

#	Time	Username	Problem	Language	Result	Execution time	Memory
124423		Mtaylor	Strange Device (APIO19_strange_device)	C++14	0 / 100	629 ms	16892 KiB

strange_device

#include <bits/stdc++.h>
 
    using namespace std;
    typedef long long ll;
    typedef vector<ll> vl ;
 
    #define mp make_pair
    #define pb push_back
    #define f first
    #define s second
    #define all(v) (v).begin(),(v).end()
 
 
    const int MOD = 1000000007;
    const int N = 1000005;
    const double PI =4*atan(1);
    const double eps = 1e-7;
    
    ll  n;
    ll a,b;
    set<pair<ll,ll> > ss;
    vector<pair<ll,ll> > v;
    
 
    int main(){
        ios::sync_with_stdio(0);
        //freopen("easy.txt","r",stdin);
        cin >> n >> a >> b;
        if(a%2==0)a/=2;
        for(int i=0;i<n;i++){
            ll  x,y;
            cin >> x >> y;
            if(y-x+1>=a){
                cout << a;
                return 0;
            }
            ll z=x%a;
            ll w=y%a;
            if(x>=z){
                v.pb(mp(z,w));
            }else{
                v.pb(mp(z,a-1));
                v.pb(mp(0,w));
            }

        }
        sort(all(v));

        ll ans=v[0].s-v[0].f+1;
        ll l=v[0].s;
        for(int i=1 ;i<v.size();i++){
            if(v[i].f>l){
                ans+=v[i].s-v[i].f+1;
                l=v[i].s;
            }else{
                ans+=v[i].s-l;
                l=v[i].s;
            }
        }
        cout << ans;

        return 0;
    }

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:51:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=1 ;i<v.size();i++){
                      ~^~~~~~~~~

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