oj.uz

Submission #60244

# Submission time Handle Problem Language Result Execution time Memory
60244 2018-07-23T22:25:21 Z ainta Sparklers (JOI17_sparklers) C++17
100 / 100
 70 ms 12384 KB 
#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 2 ms 248 KB Output is correct
2 Correct 2 ms 364 KB Output is correct
3 Correct 2 ms 440 KB Output is correct
4 Correct 2 ms 520 KB Output is correct
5 Correct 3 ms 652 KB Output is correct
6 Correct 3 ms 652 KB Output is correct
7 Correct 3 ms 652 KB Output is correct
8 Correct 2 ms 716 KB Output is correct
9 Correct 2 ms 716 KB Output is correct
10 Correct 3 ms 716 KB Output is correct
11 Correct 2 ms 716 KB Output is correct
12 Correct 2 ms 716 KB Output is correct
13 Correct 2 ms 716 KB Output is correct
14 Correct 2 ms 744 KB Output is correct
15 Correct 2 ms 744 KB Output is correct
16 Correct 2 ms 744 KB Output is correct
17 Correct 2 ms 744 KB Output is correct
18 Correct 3 ms 744 KB Output is correct
19 Correct 3 ms 744 KB Output is correct
20 Correct 3 ms 744 KB Output is correct
21 Correct 3 ms 744 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 248 KB Output is correct
2 Correct 2 ms 364 KB Output is correct
3 Correct 2 ms 440 KB Output is correct
4 Correct 2 ms 520 KB Output is correct
5 Correct 3 ms 652 KB Output is correct
6 Correct 3 ms 652 KB Output is correct
7 Correct 3 ms 652 KB Output is correct
8 Correct 2 ms 716 KB Output is correct
9 Correct 2 ms 716 KB Output is correct
10 Correct 3 ms 716 KB Output is correct
11 Correct 2 ms 716 KB Output is correct
12 Correct 2 ms 716 KB Output is correct
13 Correct 2 ms 716 KB Output is correct
14 Correct 2 ms 744 KB Output is correct
15 Correct 2 ms 744 KB Output is correct
16 Correct 2 ms 744 KB Output is correct
17 Correct 2 ms 744 KB Output is correct
18 Correct 3 ms 744 KB Output is correct
19 Correct 3 ms 744 KB Output is correct
20 Correct 3 ms 744 KB Output is correct
21 Correct 3 ms 744 KB Output is correct
22 Correct 3 ms 744 KB Output is correct
23 Correct 3 ms 744 KB Output is correct
24 Correct 2 ms 744 KB Output is correct
25 Correct 3 ms 912 KB Output is correct
26 Correct 3 ms 912 KB Output is correct
27 Correct 3 ms 912 KB Output is correct
28 Correct 4 ms 912 KB Output is correct
29 Correct 2 ms 912 KB Output is correct
30 Correct 3 ms 912 KB Output is correct
31 Correct 3 ms 912 KB Output is correct
32 Correct 4 ms 912 KB Output is correct
33 Correct 3 ms 912 KB Output is correct
34 Correct 3 ms 912 KB Output is correct
35 Correct 3 ms 912 KB Output is correct
36 Correct 4 ms 912 KB Output is correct
37 Correct 3 ms 912 KB Output is correct
38 Correct 4 ms 912 KB Output is correct
39 Correct 3 ms 912 KB Output is correct
40 Correct 3 ms 912 KB Output is correct

Subtask #3
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 248 KB Output is correct
2 Correct 2 ms 364 KB Output is correct
3 Correct 2 ms 440 KB Output is correct
4 Correct 2 ms 520 KB Output is correct
5 Correct 3 ms 652 KB Output is correct
6 Correct 3 ms 652 KB Output is correct
7 Correct 3 ms 652 KB Output is correct
8 Correct 2 ms 716 KB Output is correct
9 Correct 2 ms 716 KB Output is correct
10 Correct 3 ms 716 KB Output is correct
11 Correct 2 ms 716 KB Output is correct
12 Correct 2 ms 716 KB Output is correct
13 Correct 2 ms 716 KB Output is correct
14 Correct 2 ms 744 KB Output is correct
15 Correct 2 ms 744 KB Output is correct
16 Correct 2 ms 744 KB Output is correct
17 Correct 2 ms 744 KB Output is correct
18 Correct 3 ms 744 KB Output is correct
19 Correct 3 ms 744 KB Output is correct
20 Correct 3 ms 744 KB Output is correct
21 Correct 3 ms 744 KB Output is correct
22 Correct 3 ms 744 KB Output is correct
23 Correct 3 ms 744 KB Output is correct
24 Correct 2 ms 744 KB Output is correct
25 Correct 3 ms 912 KB Output is correct
26 Correct 3 ms 912 KB Output is correct
27 Correct 3 ms 912 KB Output is correct
28 Correct 4 ms 912 KB Output is correct
29 Correct 2 ms 912 KB Output is correct
30 Correct 3 ms 912 KB Output is correct
31 Correct 3 ms 912 KB Output is correct
32 Correct 4 ms 912 KB Output is correct
33 Correct 3 ms 912 KB Output is correct
34 Correct 3 ms 912 KB Output is correct
35 Correct 3 ms 912 KB Output is correct
36 Correct 4 ms 912 KB Output is correct
37 Correct 3 ms 912 KB Output is correct
38 Correct 4 ms 912 KB Output is correct
39 Correct 3 ms 912 KB Output is correct
40 Correct 3 ms 912 KB Output is correct
41 Correct 28 ms 3580 KB Output is correct
42 Correct 4 ms 3580 KB Output is correct
43 Correct 10 ms 3580 KB Output is correct
44 Correct 49 ms 7152 KB Output is correct
45 Correct 51 ms 7216 KB Output is correct
46 Correct 52 ms 8948 KB Output is correct
47 Correct 56 ms 9752 KB Output is correct
48 Correct 68 ms 10360 KB Output is correct
49 Correct 67 ms 12108 KB Output is correct
50 Correct 63 ms 12108 KB Output is correct
51 Correct 61 ms 12232 KB Output is correct
52 Correct 47 ms 12232 KB Output is correct
53 Correct 54 ms 12384 KB Output is correct
54 Correct 49 ms 12384 KB Output is correct
55 Correct 70 ms 12384 KB Output is correct
56 Correct 44 ms 12384 KB Output is correct
57 Correct 46 ms 12384 KB Output is correct
58 Correct 58 ms 12384 KB Output is correct
59 Correct 38 ms 12384 KB Output is correct
60 Correct 48 ms 12384 KB Output is correct
61 Correct 47 ms 12384 KB Output is correct
62 Correct 46 ms 12384 KB Output is correct
63 Correct 43 ms 12384 KB Output is correct
64 Correct 42 ms 12384 KB Output is correct
65 Correct 44 ms 12384 KB Output is correct
66 Correct 42 ms 12384 KB Output is correct
67 Correct 48 ms 12384 KB Output is correct
68 Correct 62 ms 12384 KB Output is correct
69 Correct 57 ms 12384 KB Output is correct