Submission #905976

#	Time	Username	Problem	Language	Result	Execution time	Memory
905976		AndreyPavlov	Lightning Rod (NOI18_lightningrod)	C++17	100 / 100	1379 ms	157248 KiB

Main

/* Includes */
#include <bits/stdc++.h>
#define se second
#define fi first
/* Using libraries */
using namespace std;

/* Defines */
template <class T>
using vc = vector <T>;
using ll = long long;
using ld = long double;
using pii = pair <int, int>;
template <class T>
using pq = priority_queue <T, vector <T>, less <T>>;
template <class T>
using pqr = priority_queue <T, vector <T>, greater <T>>;
#pragma GCC optimize ("03,unroll-loops")

template<class T>
void output(T &a) {
    for (auto i : a)
        cout << i << ' ';
    cout << '\n';
}

template<class T>
bool chmin(T &a, T b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}

template<class T>
bool chmax(T &a, T b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}

const int inf = 1e18;
const int mod = 1e9 + 7;
const int INF = 1e9;
const int N = 5100;

void solve() {
    int n;
    cin >> n;
    stack <pii> st;
    for (int i = 0; i < n; ++i) {
        int x, y;
        cin >> x >> y;
        while (!st.empty() && y - (x - st.top().fi) >= st.top().se) {
            st.pop();
        }
        if (st.empty() || st.top().se - (x - st.top().fi) < y) {
            st.push({x, y});
        }
    }
    cout << st.size() << '\n';
}

signed main() {
    ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    int t = 1;
    while (t--) {
        solve();
    }
}
/*
1
1 + 2
1 + 2 + 3
 */

Compilation message (stderr)

lightningrod.cpp:45:17: warning: overflow in conversion from 'double' to 'int' changes value from '1.0e+18' to '2147483647' [-Woverflow]
   45 | const int inf = 1e18;
      |                 ^~~~

• 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: 20 / 20