제출 #970500

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
970500		NoMercy	Lightning Rod (NOI18_lightningrod)	C++14	0 / 100	2045 ms	42500 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> fi , array<int , 2> se) -> 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};
        while (st.size() > 0 && check(st.top() , tmp)) {
            st.pop();
        }
        if (st.size() == 0 || check(st.top() , tmp) == false) {
            st.push(tmp);
        }
    }
    cout << st.size() << "\n";
}
 
 
int32_t main () {
 
     /////   file
    
 
    int t = 1;
    // cin >> t;
 
    while (t --) {
        test_case();
    }
 
    return 0;
}

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