Submission #1312220

#	Time	Username	Problem	Language	Result	Execution time	Memory
1312220		aryan	Lightning Rod (NOI18_lightningrod)	C++17	100 / 100	321 ms	115956 KiB

Main

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

using i64 = long long;
inline int readInt()
{
    int x = 0;
    char ch = getchar_unlocked();
    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;
}


int main(){
        
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int n;
    n = readInt();
    vector<int> su(n),di(n);
    stack<int> st;
    for(int i = 0;i < n;i++){
        int x,y;
        x = readInt();
        y = readInt();
        su[i] = x + y;
        di[i] = x - y;
        bool f = false;
        while((int) st.size() && di[i] <= di[st.top()]){
            st.pop();
            f = true;
        }
        if((int)st.size() == 0){
            st.push(i);
        }else if(f){
            st.push(i);
        }else{
            if(su[st.top()] < su[i]){
                st.push(i);
            }
        }
    }
    cout << (int) st.size() << '\n';

    return 0;
}

• 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