Submission #1063859

#	Time	Username	Problem	Language	Result	Execution time	Memory
1063859		Luvidi	Lightning Rod (NOI18_lightningrod)	C++17	100 / 100	1153 ms	157148 KiB

Main

#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define pll pair<ll, ll>
#define pii pair<int, int>
#define fs first
#define sc second
#define pb push_back

void solve() {
    int n;
    cin>>n;
    int ans=0,x1;
    vector<int> st;
    while(n--){
        int x,y;
        cin>>x>>y;
        if(!ans){
            ans++;
            x1=x+y;
            st.pb(y-x);
            continue;
        }
        if(x+y<=x1)continue;
        x1=max(x1,x+y);
        while(!st.empty()&&st.back()<=y-x)st.pop_back();
        st.push_back(y-x);
    }
    cout<<st.size();
}

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

    solve();
}

• 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