Submission #954687

#	Time	Username	Problem	Language	Result	Execution time	Memory
954687		Warinchai	Lightning Rod (NOI18_lightningrod)	C++14	100 / 100	1422 ms	262144 KiB

Main

#include<bits/stdc++.h>
using namespace std;
vector<pair<int,int>>v;
bool check(pair<int,int>f,pair<int,int>s){
    return abs(f.first-s.first)<=f.second-s.second;
}
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    int n;cin>>n;
    int a,b;
    for(int i=1;i<=n;i++){
        cin>>a>>b;
        v.push_back({a,b});
    }
    stack<pair<int,int>>st;
    st.push(v[0]);
    for(int i=1;i<n;i++){
        a=v[i].first;
        b=v[i].second;
        if(!check(st.top(),v[i])){
            while(!st.empty()&&check(v[i],st.top())){
                st.pop();
            }
            st.push(v[i]);
        }
    }
    cout<<st.size();
}

• 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