Submission #824451

#	Time	Username	Problem	Language	Result	Execution time	Memory
824451		devariaota	Lightning Rod (NOI18_lightningrod)	C++17	54 / 100	2051 ms	156256 KiB

Main

# include <bits/stdc++.h>
# define int long long
# define vi vector<int>
# define pb push_back
# define pii pair<int, int>
# define fi first
# define se second
# define endl '\n'
# define jess ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

using namespace std;

int n, x[10000005], y[10000005];
set<pii> s;

void solve() {
    cin >> n;
    bool ok=1;
    int mx=0, mn=1e9;
    for(int i=1; i<=n; i++) {
        cin >> x[i] >> y[i];
        if(y[i]!=1) ok=0;
        mx=max(mx, y[i]);
        mn=min(mn, y[i]);
    }
    if(ok) {
        cout << n << endl;
        return;
    }
    if((mx-mn)<=1) {
        int cnt=0;
        for(int i=1; i<=n; i++) {
            if(y[i]==1) cnt++;
            else {
                if(y[i-1]!=1 && y[i+1]!=1) cnt++;
            }
        }
        cout << cnt << endl;
        return;
    }
    for(int i=1; i<=n; i++) {
        s.insert({y[i], x[i]});
    }
    int ans=0;
    while(!s.empty()) {
        pii cur=*s.rbegin();
        ans++;
        vector<pii> v;
        for(pii i : s) {
            if(abs(i.se-cur.se)<=(cur.fi-i.fi)) {
                v.pb(i);
            }
        }
        for(pii i : v) s.erase(i);
    }
    cout << ans << endl;
}
 
signed main() {
    jess;
    solve();
}

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