Submission #1031374

#	Time	Username	Problem	Language	Result	Execution time	Memory
1031374		Abito	Tiles (BOI24_tiles)	C++17	4 / 100	27 ms	5388 KiB

Main

#include <bits/stdc++.h>
#define F first
#define S second
#define pb push_back
#define ppb pop_back
#define ep insert
#define endl '\n'
#define elif else if
#define pow pwr
#define sqrt sqrtt
//#define int long long
#define ll long long
#define y1 YONE
typedef unsigned long long ull;
using namespace std;
const int N=2e5+5;
int n,x[N],y[N],m,inp;
int32_t main(){
    ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
    cin>>inp>>m;
    for (int i=1;i<=inp;i++){
        int xx,yy;
        cin>>xx>>yy;
        if (i<=2){
            x[++n]=xx;
            y[n]=yy;
            continue;
        }
        if (xx==x[n] && xx==x[n-1]){
            x[n]=xx;
            y[n]=yy;
            continue;
        }
        if (yy==y[n] && yy==y[n-1]){
            x[n]=xx;
            y[n]=yy;
            continue;
        }
        x[++n]=xx;
        y[n]=yy;
    }
    if (n==2){
        cout<<m<<endl;
        return 0;
    }
    if (n==4){
        sort(x+1,x+1+n);
        sort(y+1,y+1+n);
        if (y[1]==y[n]){
            cout<<m<<endl;
            return 0;
        }
        if ((y[n]-y[1])&1){
            cout<<x[1]<<endl;
            return 0;
        }
        cout<<x[n]-bool((x[n]-x[1])&1)<<endl;
        return 0;
    }
    if (n==6){
        pair<int,int> mn={INT_MAX,INT_MAX};
        vector<pair<int,int>> v;
        for (int i=1;i<=n;i++) v.pb({x[i],y[i]}),mn=min(mn,v.back());
        while (v[0]!=mn){
            v.pb(v[0]);
            v.erase(v.begin());
        }
        if (v[1].F!=v[0].F) reverse(v.begin()+1,v.end());
        //for (auto u:v) cout<<u.F<<' '<<u.S<<endl;
        int ans=v[0].F;
        if ((v[1].S-v[0].S)%2==0){
            if ((v[2].F-v[0].F)&1){
                cout<<v[2].F-1<<endl;
                return 0;
            }
            ans=v[2].F;
        }
        else{
            cout<<ans<<endl;
            return 0;
        }
        if ((v[4].S-v[0].S)%2==0){
            ans=v.back().F-bool((v.back().F-v[0].F)&1);
        }
        cout<<ans<<endl;
        return 0;
    }
    return 0;
}

• Subtask 1: 4 / 4
• Subtask 2: 0 / 9
• Subtask 3: 0 / 11
• Subtask 4: 0 / 19
• Subtask 5: 0 / 22
• Subtask 6: 0 / 25
• Subtask 7: 0 / 10