Submission #970523

#	Time	Username	Problem	Language	Result	Execution time	Memory
970523		NoMercy	Lightning Rod (NOI18_lightningrod)	C++14	100 / 100	1352 ms	135916 KiB

Main

#include <bits/stdc++.h>
using namespace std;
 
    
int TIME = clock();
 
#define file \
            freopen("in.txt" , "r" , stdin); \
            freopen("out.txt" , "w" , stdout);
 
 
void test_case () {
    int n;
    cin >> n;
    stack <array <int , 2>> st;
    auto check = [&](array<int , 2> se , array<int , 2> fi) -> bool {
        return (abs(fi[0] - se[0]) <= fi[1] - se[1]);
    };
    for (int i = 0;i < n;i ++) {
        int x , y;
        cin >> x >> y;
        array<int , 2> tmp = {x , y};
        if (st.size() == 0) {
            st.push(tmp);
            continue;
        }
        if (check(tmp , st.top()) == true) {
            continue;
        }
        while (st.size() > 0 && check(st.top() , tmp) == true) {
            st.pop();
        }
        st.push({x , y});
    }
    cout << (int)st.size() << "\n";
}
 
 
int32_t main () {
  
  	ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
 
     /////   file
    
 
    int t = 1;
    // cin >> t;
 
    while (t --) {
        test_case();
    }
 
    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