Submission #373825

#	Time	Username	Problem	Language	Result	Execution time	Memory
373825		guka415	Lightning Rod (NOI18_lightningrod)	C++14	7 / 100	2081 ms	149052 KiB

Main

#define _CRT_SECURE_NO_WARNINGS

#include <iostream>
#include <unordered_map>
#include <map>

using namespace std;
typedef pair<int, int> pii;

int n;
map<int, int, greater<int>> mem;

int main() {
	int x, y, ret = 0, sum, diff;
	scanf("%d", &n);
	for (int i = 0; i < n; i++) {
		scanf("%d %d", &x, &y);
		sum = y - x, diff = y + x;
		if (mem.find(sum) == mem.end() || mem[sum] < diff)
			mem[sum] = diff;
	}
	int prv = -2e9;
	for (auto ii : mem) {
		if (prv < ii.second)
			ret++;
		prv = ii.second;
	}
	printf("%d", ret);
	return 0;
}

Compilation message (stderr)

lightningrod.cpp: In function 'int main()':
lightningrod.cpp:15:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   15 |  scanf("%d", &n);
      |  ~~~~~^~~~~~~~~~
lightningrod.cpp:17:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   17 |   scanf("%d %d", &x, &y);
      |   ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 4
• Subtask 2: 7 / 7
• Subtask 3: 0 / 12
• Subtask 4: 0 / 21
• Subtask 5: 0 / 26
• Subtask 6: 0 / 10
• Subtask 7: 0 / 20