Submission #828918

#	Time	Username	Problem	Language	Result	Execution time	Memory
828918		NK_	Lightning Rod (NOI18_lightningrod)	C++17	100 / 100	1539 ms	132544 KiB

Main

// Success consists of going from failure to failure without loss of enthusiasm
#include <bits/stdc++.h>
 
using namespace std;
 
#define nl '\n'
#define pb push_back 
#define mp make_pair
#define f first
#define s second
#define sz(x) int(x.size())
 
template<class T> using V = vector<T>;
using vi = V<int>;
using ll = long long;
using pi = pair<int, int>;
using vpi = V<pi>;
using vl = V<ll>;
using db = double;

const int INF = 1e9 + 10;

int main() {
	cin.tie(0)->sync_with_stdio(0);

	int N; scanf("%d", &N);

	vpi stk;
	for(int i = 0; i < N; i++) {
		int x, y; scanf("%d %d", &x, &y);
		int l = x - y, r = x + y;

		while(sz(stk) && l <= stk.back().f && stk.back().s <= r) stk.pop_back();
		if (!sz(stk) || stk.back().s < r) stk.pb(mp(l, r));
	}

	printf("%d", sz(stk));
	exit(0-0);
}					

Compilation message (stderr)

lightningrod.cpp: In function 'int main()':
lightningrod.cpp:26:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |  int N; scanf("%d", &N);
      |         ~~~~~^~~~~~~~~~
lightningrod.cpp:30:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |   int x, y; scanf("%d %d", &x, &y);
      |             ~~~~~^~~~~~~~~~~~~~~~~

• 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