Submission #829032

#	Time	Username	Problem	Language	Result	Execution time	Memory
829032		kebine	Lightning Rod (NOI18_lightningrod)	C++17	80 / 100	2012 ms	174120 KiB

Main

#include <bits/stdc++.h>
typedef long long ll;
#define ii pair<ll,ll>
#define fi first
#define se second
#define pb push_back
#define mp make_pair
using namespace std;

vector<ii> seg;
bool comp(ii a, ii b){
    if(a.fi == b.fi) return a.se > b.se;
    return a.fi < b.fi;
}

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    int n;
    cin >> n;
    seg.resize(n);
    ll x, y;
    for(int i=0; i<n; i++){
        cin >> x >> y;
        seg[i] = mp(x-y, x+y);
    }
    sort(seg.begin(), seg.end(), comp);

    ll r=-1e18, R=-1e18, cnt = 0;
    for(int i=0; i<n; i++){
        // cout<<seg[i].fi<<' '<<seg[i].se<<'\n';
        R = max(r, seg[i].se);
        if(seg[i].se > r){
            ++cnt;
            r = R;
        }
    }
    cout << cnt << '\n';

    return 0;
}

• Subtask 1: 4 / 4
• Subtask 2: 7 / 7
• Subtask 3: 12 / 12
• Subtask 4: 21 / 21
• Subtask 5: 26 / 26
• Subtask 6: 10 / 10
• Subtask 7: 0 / 20