oj.uz

Submission #157690

# Submission time Handle Problem Language Result Execution time Memory
157690 2019-10-12T17:59:23 Z imyujin Sparklers (JOI17_sparklers) C++17
100 / 100
 125 ms 7068 KB 
#include <bits/stdc++.h>
using namespace std;

typedef long long lint;
typedef pair<lint, lint> pll;

#define fi first
#define se second

const int MAXN = 100010;
const int INF = 1 << 30;

lint X[MAXN];

void solve(vector<lint> &v, vector<pll> &r, vector<pll> &x) {
	for(auto &a : v) {
		pll t = pll(a, max(-a, 0ll));
		while(!r.empty() && t.fi < 0) {
			t.se = max(t.se, r.back().se - t.fi);
			t.fi += r.back().fi;
			r.pop_back();
		}
		(t.fi >= 0 ? r : x).push_back(t);
	}
}

int main() {
	ios::sync_with_stdio(0); cin.tie(0);
	int N, K;
	lint T;

	cin >> N >> K >> T;
	for(int i = 1; i <= N; i++) cin >> X[i];

	lint s = 0, e = INF;
	while(s < e) {
		lint m = (s + e) / 2;
		vector<lint> v1, v2;
		for(int i = 1; i < K; i++) v1.push_back(2 * T * m - X[i + 1] + X[i]);
		for(int i = N; i > K; i--) v2.push_back(2 * T * m - X[i] + X[i - 1]);
		vector<pll> r1, r2, x1, x2;
		solve(v1, r1, x1);
		solve(v2, r2, x2);

		lint t = 0;
		int p1 = int(r1.size()) - 1, p2 = int(r2.size()) - 1;
		while(p1 >= 0 || p2 >= 0) {
			if(p1 >= 0 && t >= r1[p1].se) t += r1[p1--].fi;
			else if(p2 >= 0 && t >= r2[p2].se) t += r2[p2--].fi;
			else break;
		}
		if(p1 >= 0 || p2 >= 0) {
			s = m + 1;
			continue;
		}
		p1 = p2 = 0;
		t = 0;
		for(auto a : v1) t += a;
		for(auto a : v2) t += a;
		while(p1 < x1.size() || p2 < x2.size()) {
			if(p1 < x1.size() && t - x1[p1].fi >= x1[p1].se) t -= x1[p1++].fi;
			else if(p2 < x2.size() && t - x2[p2].fi >= x2[p2].se) t -= x2[p2++].fi;
			else break;
		}
		if(p1 < x1.size() || p2 < x2.size()) s = m + 1;
		else e = m;
	}
	cout << s << "\n";
	return 0;
}

Compilation message

sparklers.cpp: In function 'int main()':
sparklers.cpp:60:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(p1 < x1.size() || p2 < x2.size()) {
         ~~~^~~~~~~~~~~
sparklers.cpp:60:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(p1 < x1.size() || p2 < x2.size()) {
                           ~~~^~~~~~~~~~~
sparklers.cpp:61:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    if(p1 < x1.size() && t - x1[p1].fi >= x1[p1].se) t -= x1[p1++].fi;
       ~~~^~~~~~~~~~~
sparklers.cpp:62:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    else if(p2 < x2.size() && t - x2[p2].fi >= x2[p2].se) t -= x2[p2++].fi;
            ~~~^~~~~~~~~~~
sparklers.cpp:65:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(p1 < x1.size() || p2 < x2.size()) s = m + 1;
      ~~~^~~~~~~~~~~
sparklers.cpp:65:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(p1 < x1.size() || p2 < x2.size()) s = m + 1;
                        ~~~^~~~~~~~~~~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 380 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 376 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Correct 2 ms 376 KB Output is correct
13 Correct 2 ms 376 KB Output is correct
14 Correct 2 ms 376 KB Output is correct
15 Correct 2 ms 376 KB Output is correct
16 Correct 2 ms 376 KB Output is correct
17 Correct 2 ms 376 KB Output is correct
18 Correct 2 ms 376 KB Output is correct
19 Correct 2 ms 376 KB Output is correct
20 Correct 2 ms 376 KB Output is correct
21 Correct 2 ms 376 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 380 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 376 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Correct 2 ms 376 KB Output is correct
13 Correct 2 ms 376 KB Output is correct
14 Correct 2 ms 376 KB Output is correct
15 Correct 2 ms 376 KB Output is correct
16 Correct 2 ms 376 KB Output is correct
17 Correct 2 ms 376 KB Output is correct
18 Correct 2 ms 376 KB Output is correct
19 Correct 2 ms 376 KB Output is correct
20 Correct 2 ms 376 KB Output is correct
21 Correct 2 ms 376 KB Output is correct
22 Correct 3 ms 376 KB Output is correct
23 Correct 3 ms 376 KB Output is correct
24 Correct 3 ms 376 KB Output is correct
25 Correct 3 ms 468 KB Output is correct
26 Correct 3 ms 376 KB Output is correct
27 Correct 3 ms 376 KB Output is correct
28 Correct 3 ms 376 KB Output is correct
29 Correct 3 ms 376 KB Output is correct
30 Correct 3 ms 376 KB Output is correct
31 Correct 3 ms 376 KB Output is correct
32 Correct 3 ms 376 KB Output is correct
33 Correct 3 ms 376 KB Output is correct
34 Correct 3 ms 376 KB Output is correct
35 Correct 3 ms 376 KB Output is correct
36 Correct 3 ms 380 KB Output is correct
37 Correct 3 ms 376 KB Output is correct
38 Correct 3 ms 376 KB Output is correct
39 Correct 3 ms 376 KB Output is correct
40 Correct 3 ms 376 KB Output is correct

Subtask #3
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 2 ms 376 KB Output is correct
8 Correct 2 ms 380 KB Output is correct
9 Correct 2 ms 376 KB Output is correct
10 Correct 2 ms 376 KB Output is correct
11 Correct 2 ms 376 KB Output is correct
12 Correct 2 ms 376 KB Output is correct
13 Correct 2 ms 376 KB Output is correct
14 Correct 2 ms 376 KB Output is correct
15 Correct 2 ms 376 KB Output is correct
16 Correct 2 ms 376 KB Output is correct
17 Correct 2 ms 376 KB Output is correct
18 Correct 2 ms 376 KB Output is correct
19 Correct 2 ms 376 KB Output is correct
20 Correct 2 ms 376 KB Output is correct
21 Correct 2 ms 376 KB Output is correct
22 Correct 3 ms 376 KB Output is correct
23 Correct 3 ms 376 KB Output is correct
24 Correct 3 ms 376 KB Output is correct
25 Correct 3 ms 468 KB Output is correct
26 Correct 3 ms 376 KB Output is correct
27 Correct 3 ms 376 KB Output is correct
28 Correct 3 ms 376 KB Output is correct
29 Correct 3 ms 376 KB Output is correct
30 Correct 3 ms 376 KB Output is correct
31 Correct 3 ms 376 KB Output is correct
32 Correct 3 ms 376 KB Output is correct
33 Correct 3 ms 376 KB Output is correct
34 Correct 3 ms 376 KB Output is correct
35 Correct 3 ms 376 KB Output is correct
36 Correct 3 ms 380 KB Output is correct
37 Correct 3 ms 376 KB Output is correct
38 Correct 3 ms 376 KB Output is correct
39 Correct 3 ms 376 KB Output is correct
40 Correct 3 ms 376 KB Output is correct
41 Correct 82 ms 4044 KB Output is correct
42 Correct 5 ms 564 KB Output is correct
43 Correct 21 ms 1340 KB Output is correct
44 Correct 123 ms 7012 KB Output is correct
45 Correct 97 ms 5508 KB Output is correct
46 Correct 115 ms 6708 KB Output is correct
47 Correct 116 ms 6516 KB Output is correct
48 Correct 98 ms 5548 KB Output is correct
49 Correct 125 ms 7068 KB Output is correct
50 Correct 98 ms 5508 KB Output is correct
51 Correct 117 ms 6784 KB Output is correct
52 Correct 118 ms 6576 KB Output is correct
53 Correct 121 ms 7044 KB Output is correct
54 Correct 119 ms 6616 KB Output is correct
55 Correct 103 ms 5544 KB Output is correct
56 Correct 116 ms 6896 KB Output is correct
57 Correct 119 ms 6872 KB Output is correct
58 Correct 106 ms 5540 KB Output is correct
59 Correct 103 ms 4748 KB Output is correct
60 Correct 109 ms 6576 KB Output is correct
61 Correct 121 ms 6512 KB Output is correct
62 Correct 107 ms 6852 KB Output is correct
63 Correct 104 ms 6432 KB Output is correct
64 Correct 89 ms 5500 KB Output is correct
65 Correct 90 ms 5616 KB Output is correct
66 Correct 91 ms 5488 KB Output is correct
67 Correct 88 ms 5524 KB Output is correct
68 Correct 108 ms 6488 KB Output is correct
69 Correct 110 ms 6552 KB Output is correct