Submission #60003

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
60003	2018-07-23T12:02:16 Z	ainta(#1720)	Sparklers (JOI17_sparklers)	C++11	100 / 100	69 ms	6564 KB

sparklers

#include<cstdio>
#include<algorithm>
#define N_ 101000
using namespace std;
int n, st, n1, n2, D[N_];
long long T, INF = 1e9, X[N_];
long long A[N_], B[N_], AA[N_], BB[N_];
struct point {
	int pv;
	long long Mn, Mx;
}w[N_];
bool Do() {
	int i, cnt = 0;
	n1--, n2--;
	long long Mx = -4e18, Mn = 4e18;
	for (i = 0; i <= n2; i++) {
		Mn = min(Mn, B[i]);
		if (Mx <= B[i]) {
			Mx = B[i];
			w[cnt++] = { i,Mn,Mx };
			Mn = B[i];
		}
	}
	for (i = 0; i < cnt; i++) {
		if (w[i].Mn + A[0] < 0)break;
	}
	D[0] = i - 1;
	if (D[0] == -1)return false;
	for (i = 1; i <= n1; i++) {
		if (w[D[i - 1]].Mx + A[i] < 0)return false;
		int pv = D[i - 1];
		while (pv < cnt - 1 && w[pv + 1].Mn + A[i] >= 0)pv++;
		D[i] = pv;
	}
	return w[D[n1]].pv == n2;
}
bool Pos(long long KK) {
	long long L = T*KK;
	if (L >= 1e9)return true;
	int i, j;
	for (i = st; i >= 1; i--) {
		AA[i] = X[i] + L * 2 * (st - i);
	}
	for (i = st; i <= n; i++) {
		BB[i] = -(X[i] - L * 2 * (i - st));
	}
	int pv1 = st, pv2 = st;

	for (i = st; i >= 1; i--) if (AA[pv1] < AA[i])pv1 = i;
	for (i = st; i <= n; i++) if (BB[pv2] < BB[i])pv2 = i;
	n1 = 0, n2 = 0;
	for (i = st; i >= pv1; i--)  A[n1++] = AA[i];
	for (i = st; i <= pv2; i++)  B[n2++] = BB[i];
	if (!Do())return false;

	n1 = 0, n2 = 0;
	for (i = 1; i <= pv1; i++)  A[n1++] = AA[i];
	for (i = n; i >= pv2; i--)  B[n2++] = BB[i];
	if (!Do())return false;
	return true;

}
int main() {
	int i;
	scanf("%d%d%lld", &n, &st, &T);
	for (i = 1; i <= n; i++) {
		scanf("%lld", &X[i]);
	}
	long long b = 0, e = 1e9, mid, res;
	while (b <= e) {
		mid = (b + e) / 2;
		if (Pos(mid)) {
			res = mid;
			e = mid - 1;
		}
		else b = mid + 1;
	}
	printf("%d\n", res);
}

Compilation message

sparklers.cpp: In function 'bool Pos(long long int)':
sparklers.cpp:40:9: warning: unused variable 'j' [-Wunused-variable]
  int i, j;
         ^
sparklers.cpp: In function 'int main()':
sparklers.cpp:78:20: warning: format '%d' expects argument of type 'int', but argument 2 has type 'long long int' [-Wformat=]
  printf("%d\n", res);
                    ^
sparklers.cpp:65:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d%d%lld", &n, &st, &T);
  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
sparklers.cpp:67:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld", &X[i]);
   ~~~~~^~~~~~~~~~~~~~~

Subtask #1
30.0 / 30.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	3 ms	248 KB	Output is correct
2	Correct	3 ms	484 KB	Output is correct
3	Correct	2 ms	484 KB	Output is correct
4	Correct	3 ms	484 KB	Output is correct
5	Correct	2 ms	560 KB	Output is correct
6	Correct	3 ms	560 KB	Output is correct
7	Correct	3 ms	560 KB	Output is correct
8	Correct	2 ms	592 KB	Output is correct
9	Correct	3 ms	592 KB	Output is correct
10	Correct	3 ms	592 KB	Output is correct
11	Correct	2 ms	592 KB	Output is correct
12	Correct	2 ms	612 KB	Output is correct
13	Correct	3 ms	612 KB	Output is correct
14	Correct	2 ms	612 KB	Output is correct
15	Correct	3 ms	612 KB	Output is correct
16	Correct	3 ms	612 KB	Output is correct
17	Correct	2 ms	612 KB	Output is correct
18	Correct	3 ms	612 KB	Output is correct
19	Correct	2 ms	732 KB	Output is correct
20	Correct	2 ms	732 KB	Output is correct
21	Correct	2 ms	732 KB	Output is correct

Subtask #2
20.0 / 20.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	3 ms	248 KB	Output is correct
2	Correct	3 ms	484 KB	Output is correct
3	Correct	2 ms	484 KB	Output is correct
4	Correct	3 ms	484 KB	Output is correct
5	Correct	2 ms	560 KB	Output is correct
6	Correct	3 ms	560 KB	Output is correct
7	Correct	3 ms	560 KB	Output is correct
8	Correct	2 ms	592 KB	Output is correct
9	Correct	3 ms	592 KB	Output is correct
10	Correct	3 ms	592 KB	Output is correct
11	Correct	2 ms	592 KB	Output is correct
12	Correct	2 ms	612 KB	Output is correct
13	Correct	3 ms	612 KB	Output is correct
14	Correct	2 ms	612 KB	Output is correct
15	Correct	3 ms	612 KB	Output is correct
16	Correct	3 ms	612 KB	Output is correct
17	Correct	2 ms	612 KB	Output is correct
18	Correct	3 ms	612 KB	Output is correct
19	Correct	2 ms	732 KB	Output is correct
20	Correct	2 ms	732 KB	Output is correct
21	Correct	2 ms	732 KB	Output is correct
22	Correct	3 ms	732 KB	Output is correct
23	Correct	3 ms	732 KB	Output is correct
24	Correct	3 ms	732 KB	Output is correct
25	Correct	3 ms	732 KB	Output is correct
26	Correct	3 ms	732 KB	Output is correct
27	Correct	3 ms	732 KB	Output is correct
28	Correct	3 ms	732 KB	Output is correct
29	Correct	3 ms	732 KB	Output is correct
30	Correct	2 ms	732 KB	Output is correct
31	Correct	3 ms	732 KB	Output is correct
32	Correct	3 ms	732 KB	Output is correct
33	Correct	3 ms	732 KB	Output is correct
34	Correct	3 ms	732 KB	Output is correct
35	Correct	4 ms	732 KB	Output is correct
36	Correct	4 ms	732 KB	Output is correct
37	Correct	4 ms	732 KB	Output is correct
38	Correct	3 ms	740 KB	Output is correct
39	Correct	4 ms	740 KB	Output is correct
40	Correct	2 ms	740 KB	Output is correct

Subtask #3
50.0 / 50.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	3 ms	248 KB	Output is correct
2	Correct	3 ms	484 KB	Output is correct
3	Correct	2 ms	484 KB	Output is correct
4	Correct	3 ms	484 KB	Output is correct
5	Correct	2 ms	560 KB	Output is correct
6	Correct	3 ms	560 KB	Output is correct
7	Correct	3 ms	560 KB	Output is correct
8	Correct	2 ms	592 KB	Output is correct
9	Correct	3 ms	592 KB	Output is correct
10	Correct	3 ms	592 KB	Output is correct
11	Correct	2 ms	592 KB	Output is correct
12	Correct	2 ms	612 KB	Output is correct
13	Correct	3 ms	612 KB	Output is correct
14	Correct	2 ms	612 KB	Output is correct
15	Correct	3 ms	612 KB	Output is correct
16	Correct	3 ms	612 KB	Output is correct
17	Correct	2 ms	612 KB	Output is correct
18	Correct	3 ms	612 KB	Output is correct
19	Correct	2 ms	732 KB	Output is correct
20	Correct	2 ms	732 KB	Output is correct
21	Correct	2 ms	732 KB	Output is correct
22	Correct	3 ms	732 KB	Output is correct
23	Correct	3 ms	732 KB	Output is correct
24	Correct	3 ms	732 KB	Output is correct
25	Correct	3 ms	732 KB	Output is correct
26	Correct	3 ms	732 KB	Output is correct
27	Correct	3 ms	732 KB	Output is correct
28	Correct	3 ms	732 KB	Output is correct
29	Correct	3 ms	732 KB	Output is correct
30	Correct	2 ms	732 KB	Output is correct
31	Correct	3 ms	732 KB	Output is correct
32	Correct	3 ms	732 KB	Output is correct
33	Correct	3 ms	732 KB	Output is correct
34	Correct	3 ms	732 KB	Output is correct
35	Correct	4 ms	732 KB	Output is correct
36	Correct	4 ms	732 KB	Output is correct
37	Correct	4 ms	732 KB	Output is correct
38	Correct	3 ms	740 KB	Output is correct
39	Correct	4 ms	740 KB	Output is correct
40	Correct	2 ms	740 KB	Output is correct
41	Correct	35 ms	3308 KB	Output is correct
42	Correct	5 ms	3308 KB	Output is correct
43	Correct	15 ms	3308 KB	Output is correct
44	Correct	67 ms	6220 KB	Output is correct
45	Correct	52 ms	6220 KB	Output is correct
46	Correct	69 ms	6220 KB	Output is correct
47	Correct	57 ms	6220 KB	Output is correct
48	Correct	55 ms	6220 KB	Output is correct
49	Correct	53 ms	6564 KB	Output is correct
50	Correct	52 ms	6564 KB	Output is correct
51	Correct	58 ms	6564 KB	Output is correct
52	Correct	64 ms	6564 KB	Output is correct
53	Correct	67 ms	6564 KB	Output is correct
54	Correct	47 ms	6564 KB	Output is correct
55	Correct	63 ms	6564 KB	Output is correct
56	Correct	58 ms	6564 KB	Output is correct
57	Correct	44 ms	6564 KB	Output is correct
58	Correct	52 ms	6564 KB	Output is correct
59	Correct	44 ms	6564 KB	Output is correct
60	Correct	48 ms	6564 KB	Output is correct
61	Correct	45 ms	6564 KB	Output is correct
62	Correct	59 ms	6564 KB	Output is correct
63	Correct	46 ms	6564 KB	Output is correct
64	Correct	67 ms	6564 KB	Output is correct
65	Correct	49 ms	6564 KB	Output is correct
66	Correct	47 ms	6564 KB	Output is correct
67	Correct	47 ms	6564 KB	Output is correct
68	Correct	47 ms	6564 KB	Output is correct
69	Correct	45 ms	6564 KB	Output is correct

Submission #60003

Compilation message

Subtask #1 30.0 / 30.0

Subtask #2 20.0 / 20.0

Subtask #3 50.0 / 50.0

Subtask #1
30.0 / 30.0

Subtask #2
20.0 / 20.0

Subtask #3
50.0 / 50.0