Submission #183930

#	Time	Username	Problem	Language	Result	Execution time	Memory
183930		duttaditya18	Lightning Rod (NOI18_lightningrod)	C++17	66 / 100	2064 ms	252856 KiB

Main

#include <bits/stdc++.h>

using namespace std;

#define fi first
#define se second

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

    int n; cin >> n;

    // x, y
    pair<int, int> p[n + 1];

    for(int i = 1; i <= n; i++)
        cin >> p[i].fi >> p[i].se;

    int suf[n + 2] = {};
    int prf[n + 2] = {};

    prf[0] = INT_MIN;
    prf[n + 1] = INT_MIN;

    suf[0] = INT_MAX;
    suf[n + 1] = INT_MAX;

    for(int i = 1; i <= n; i++)
        prf[i] = max(prf[i - 1], p[i].fi + p[i].se);


    for(int i = n; i >= 1; i--)
        suf[i] = min(suf[i + 1], p[i].fi - p[i].se);


    int ans = n;
    for(int i = 1; i <= n; i++)
        ans -= ((p[i].fi + p[i].se <= prf[i - 1]) || (p[i].fi - p[i].se >= suf[i + 1]));
    cout << ans << endl;
}

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