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Submission #909407

# Submission time Handle Problem Language Result Execution time Memory
909407 2024-01-17T07:54:26 Z LOLOLO Lightning Rod (NOI18_lightningrod) C++17
0 / 100
 1253 ms 262144 KB 
#include <bits/stdc++.h>
#define fi first
#define se second
using namespace std;

typedef long long ll;
typedef pair<ll, ll> pa;

const ll N = 1e6 + 1;
const ll MOD = 1e9 + 7;
const ll INF = 1e12;
int pr[N], suff[N];

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

    vector <pair <int, int>> v;
    for (int i = 1; i <= n; i++) {
        int x, y;
        cin >> x >> y;
        v.push_back({x, y});
    }

    pr[0] = v[0].fi - v[0].se;
    for (int i = 1; i < n; i++) {
        pr[i] = max(pr[i - 1], v[i].fi + v[i].se);
    }

    suff[n - 1] = v[n - 1].fi + v[n - 1].se;
    for (int i = n - 2; i >= 0; i--) {
        suff[i] = min(suff[i + 1], v[i].fi - v[i].se);
    }

    int cnt = 0;
    if (suff[1] > v[0].fi - v[0].se)
        cnt++;

    if (pr[n - 2] < v[n - 1].fi + v[n - 1].se)
        cnt++;

    for (int i = 1; i < n - 1; i++) {
        if (suff[i + 1] > v[i].fi - v[i].se && pr[i - 1] < v[i].fi + v[i].se) {
            cnt++;
        }
    }

    cout << cnt << '\n';
    return 0;
}

// x(i) - x(j) <= y(i) - y(j)
// x(i) - y(i) <= x(j) - y(j)

// x(j) - x(i) <= y(i) - y(j)
// x(j) + y(j) <= x(i) + y(i)

Subtask #1
0 / 4.0

# Verdict Execution time Memory Grader output
1 Runtime error 1253 ms 262144 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #2
0 / 7.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 2656 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 2656 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 21.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 2656 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #5
0 / 26.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 2656 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #6
0 / 10.0

# Verdict Execution time Memory Grader output
1 Runtime error 1227 ms 262144 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #7
0 / 20.0

# Verdict Execution time Memory Grader output
1 Runtime error 1253 ms 262144 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -