Submission #537113

#	Time	Username	Problem	Language	Result	Execution time	Memory
537113		rainboy	스트랩 (JOI14_straps)	C11	100 / 100	21 ms	436 KiB

straps

#include <stdio.h>
#include <string.h>

#define N	2000
#define INF	0x7fffffff

int min(int a, int b) { return a < b ? a : b; }
int max(int a, int b) { return a > b ? a : b; }

int main() {
	static int dp[N + N + 1], dq[N + N + 1];
	int n, i, s, t, ans;

	scanf("%d", &n);
	for (s = -n; s <= n; s++)
		dp[n + s] = -INF;
	dp[n + 1] = 0;
	for (i = 0; i < n; i++) {
		int a, b;

		scanf("%d%d", &a, &b), a--;
		memcpy(dq, dp, (n * 2 + 1) * sizeof *dp);
		for (s = -n; s <= n; s++) {
			int x = dq[n + s];

			if (x == -INF)
				continue;
			t = min(s + a, n);
			dp[n + t] = max(dp[n + t], x + b);
		}
	}
	ans = -INF;
	for (s = 0; s <= n; s++)
		ans = max(ans, dp[n + s]);
	printf("%d\n", ans);
	return 0;
}

Compilation message (stderr)

straps.c: In function 'main':
straps.c:14:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |  scanf("%d", &n);
      |  ^~~~~~~~~~~~~~~
straps.c:21:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   21 |   scanf("%d%d", &a, &b), a--;
      |   ^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 45 / 45
• Subtask 4: 45 / 45