Submission #722771

#	Time	Username	Problem	Language	Result	Execution time	Memory
722771		rainboy	Card Scoring (CCO19_day2problem1)	C++17	25 / 100	4867 ms	96992 KiB

Main

#include <math.h>
#include <stdio.h>
#include <stdlib.h>

#define N	1000000

int *xx[N]; double *yy[N]; int cnt[N], cnt_[N], xx_[N], n; double k;

int crossover(int x1, double y1, int x2, double y2) {
	int lower = x2, upper = n + 1;

	while (upper - lower > 1) {
		int x = (lower + upper) / 2;

		if (y1 + pow(x - x1, k) >= y2 + pow(x - x2, k))
			upper = x;
		else
			lower = x;
	}
	return upper;
}

void add(int a, double y) {
	while (cnt[a] && crossover(xx[a][cnt[a] - 2], yy[a][cnt[a] - 2], xx[a][cnt[a] - 1], yy[a][cnt[a] - 1]) <= crossover(xx[a][cnt[a] - 1], yy[a][cnt[a] - 1], xx_[a], y))
		cnt[a]--;
	if (cnt[a] == cnt_[a]) {
		xx[a] = (int *) realloc(xx[a], cnt_[a] * 2 * sizeof *xx[a]);
		yy[a] = (double *) realloc(yy[a], cnt_[a] * 2 * sizeof *yy[a]);
		cnt_[a] *= 2;
	}
	xx[a][cnt[a]] = xx_[a], yy[a][cnt[a]] = y, cnt[a]++;
	xx_[a]++;
}

int main() {
	int i, a;
	double y;

	scanf("%lf%d", &k, &n), k /= 2;
	for (a = 0; a < n; a++) {
		xx[a] = (int *) malloc((cnt_[a] = 2) * sizeof *xx[a]);
		yy[a] = (double *) malloc((cnt_[a] = 2) * sizeof *yy[a]);
	}
	y = 0;
	for (i = 0; i < n; i++) {
		scanf("%d", &a), a--;
		add(a, y);
		while (cnt[a] && yy[a][cnt[a] - 1] + pow(xx_[a] - xx[a][cnt[a] - 1], k) <= yy[a][cnt[a] - 2] + pow(xx_[a] - xx[a][cnt[a] - 2], k))
			cnt[a]--;
		y = yy[a][cnt[a] - 1] + pow(xx_[a] - xx[a][cnt[a] - 1], k);
	}
	printf("%.9f\n", y);
	return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:39:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   39 |  scanf("%lf%d", &k, &n), k /= 2;
      |  ~~~~~^~~~~~~~~~~~~~~~~
Main.cpp:46:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   46 |   scanf("%d", &a), a--;
      |   ~~~~~^~~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 1 / 1
• Subtask 3: 5 / 5
• Subtask 4: 3 / 3
• Subtask 5: 3 / 3
• Subtask 6: 9 / 9