Submission #1139846

#	Time	Username	Problem	Language	Result	Execution time	Memory
1139846		mattsoh	Lightning Rod (NOI18_lightningrod)	C++17	100 / 100	416 ms	160000 KiB

Main

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
stack<pair<ll,ll>> st;
inline int readInt() {
    int x = 0;
    char ch = getchar();
    while (ch < '0' || ch > '9') ch = getchar_unlocked();
    while (ch >= '0' && ch <= '9'){
		x = (x << 3) + (x << 1) + ch - '0';
		ch = getchar_unlocked();
	}
    return x;
}

signed main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);cout.tie(NULL);
    ll n;
    n = readInt();
    for (ll i = 0;i<n;i++){
        ll x,y;
        x = readInt();
        y = readInt();
        while (true){
            if (st.size() == 0){
                st.push({x,y});
                break;
            }
            ll sx = st.top().first, sy = st.top().second;
            if (x-sx<=sy-y) break;
            else if (x-sx <=y-sy) st.pop();
            else {
                st.push({x,y});
                break;
            }
        }
    }
    cout<<st.size()<<endl;
}

• 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