Submission #784090

#	Time	Username	Problem	Language	Result	Execution time	Memory
784090		rainboy	Lightning Rod (NOI18_lightningrod)	C11	100 / 100	1786 ms	225936 KiB

Main

#include <stdio.h>

#define N	10000000

int main() {
	static int qu[N], ll[N], rr[N];
	int n, cnt, i, x, y;

	scanf("%d", &n);
	cnt = 0;
	for (i = 0; i < n; i++) {
		scanf("%d%d", &x, &y);
		ll[i] = x - y, rr[i] = x + y;
		if (cnt == 0 || rr[qu[cnt - 1]] < rr[i]) {
			while (cnt && ll[qu[cnt - 1]] >= ll[i])
				cnt--;
			qu[cnt++] = i;
		}
	}
	printf("%d\n", cnt);
	return 0;
}

Compilation message (stderr)

lightningrod.c: In function 'main':
lightningrod.c:9:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |  scanf("%d", &n);
      |  ^~~~~~~~~~~~~~~
lightningrod.c:12:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |   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