제출 #373826

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
373826		guka415	Lightning Rod (NOI18_lightningrod)	C++14	66 / 100	2094 ms	152868 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;
}

컴파일 시 표준 에러 (stderr) 메시지

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);
      |   ~~~~~^~~~~~~~~~~~~~~~~

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