oj.uz

답안 #824393

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
824393 2023-08-14T05:16:03 Z 이동현(#10361) Winter Driving (CCO19_day1problem3) C++17
25 / 25
 105 ms 24224 KB 
#include <bits/stdc++.h>
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("unroll-loops")
#define int long long
using namespace std;

signed main(){
	ios_base::sync_with_stdio(false);
	cin.tie(0);

	int n;
	cin >> n;
	vector<int> a(n);
	for(int i = 0; i < n; ++i){
		cin >> a[i];
	}
	vector<vector<int>> way(n);
	for(int i = 1; i < n; ++i){
		int x;
		cin >> x;
		--x;
		way[x].push_back(i);
		way[i].push_back(x);
	}

	int ans = 0;
	auto sol = [&](int rt){
		int allsum = 0, cnt = 0;

		auto dfs = [&](auto&&self, int x, int pr, int psum)->void{
			allsum += a[x] * psum;
			cnt += a[x];
			for(auto&nxt:way[x]){
				if(nxt == pr){
					continue;
				}

				self(self, nxt, x, psum + a[x]);
			}
		};
		
		vector<int> vc;
		for(int i = 0; i < (int)way[rt].size(); ++i){
			cnt = 0;
			dfs(dfs, way[rt][i], rt, a[rt]);

			vc.push_back(cnt);
		}
		
		vector<int> l, r;
		int lsz = (int)vc.size() / 2;
		int rsz = (int)vc.size() - lsz;

		for(int i = 0; i < (1 << lsz); ++i){
			int sum = 0;
			for(int j = 0; j < lsz; ++j){
				if(i & (1 << j)){
					sum += vc[j];
				}
			}
			l.push_back(sum);
		}

		for(int i = 0; i < (1 << rsz); ++i){
			int sum = 0;
			for(int j = 0; j < rsz; ++j){
				if(i & (1 << j)){
					sum += vc[j + lsz];
				}
			}
			r.push_back(sum);
		}

		sort(l.begin(), l.end());
		sort(r.begin(), r.end());

		int allvc = accumulate(vc.begin(), vc.end(), 0ll);
		int mx = 0;
		for(int i = 0, j = (int)r.size() - 1; i < (int)l.size(); ++i){
			while(j && (l[i] + r[j]) * (allvc - l[i] - r[j]) <= (l[i] + r[j - 1]) * (allvc - l[i] - r[j - 1])){
				--j;
			}
			mx = max(mx, (l[i] + r[j]) * (allvc - l[i] - r[j]));
		}

		ans = max(ans, allsum + mx);
	};

	vector<int> sz(n);

	auto dfssz = [&](auto&&self, int x, int pr)->void{
		sz[x] = a[x];
		for(auto&nxt:way[x]){
			if(nxt == pr){
				continue;
			}
			self(self, nxt, x);
			sz[x] += sz[nxt];
		}
	};
	dfssz(dfssz, 0, -1);

	auto getcent = [&](auto&&self, int x, int pr)->int{
		for(auto&nxt:way[x]){
			if(nxt == pr){
				continue;
			}
			if(sz[nxt] * 2 > sz[0]){
				return self(self, nxt, x);
			}
		}
		return x;
	};
	int ct = getcent(getcent, 0, -1);

	sol(ct);
	// for(int i = 0; i < n; ++i){
	// 	sol(i);
	// }

	for(int i = 0; i < n; ++i){
		ans += a[i] * (a[i] - 1);
	}

	cout << ans << '\n';
	
	return 0;
}

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 0 ms 212 KB Output is correct
16 Correct 0 ms 212 KB Output is correct
17 Correct 0 ms 212 KB Output is correct
18 Correct 0 ms 212 KB Output is correct

Subtask #2
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 0 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct

Subtask #3
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 0 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 0 ms 340 KB Output is correct
8 Correct 0 ms 340 KB Output is correct
9 Correct 0 ms 340 KB Output is correct
10 Correct 0 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 0 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 70 ms 14600 KB Output is correct
19 Correct 66 ms 14972 KB Output is correct
20 Correct 67 ms 16624 KB Output is correct
21 Correct 62 ms 16620 KB Output is correct
22 Correct 83 ms 16660 KB Output is correct
23 Correct 67 ms 16732 KB Output is correct
24 Correct 55 ms 14020 KB Output is correct
25 Correct 48 ms 14000 KB Output is correct
26 Correct 46 ms 13960 KB Output is correct
27 Correct 66 ms 14100 KB Output is correct
28 Correct 57 ms 15644 KB Output is correct
29 Correct 92 ms 17424 KB Output is correct
30 Correct 37 ms 19020 KB Output is correct
31 Correct 38 ms 19032 KB Output is correct
32 Correct 44 ms 19028 KB Output is correct
33 Correct 39 ms 19144 KB Output is correct
34 Correct 38 ms 19056 KB Output is correct
35 Correct 39 ms 19080 KB Output is correct
36 Correct 38 ms 19016 KB Output is correct
37 Correct 41 ms 19008 KB Output is correct
38 Correct 53 ms 24148 KB Output is correct

Subtask #4
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 62 ms 5464 KB Output is correct
2 Correct 63 ms 5448 KB Output is correct
3 Correct 67 ms 5444 KB Output is correct
4 Correct 66 ms 5416 KB Output is correct
5 Correct 62 ms 5452 KB Output is correct
6 Correct 69 ms 5440 KB Output is correct
7 Correct 63 ms 5416 KB Output is correct
8 Correct 62 ms 5404 KB Output is correct
9 Correct 62 ms 5416 KB Output is correct
10 Correct 61 ms 5448 KB Output is correct
11 Correct 63 ms 5428 KB Output is correct
12 Correct 62 ms 5468 KB Output is correct
13 Correct 63 ms 5448 KB Output is correct
14 Correct 66 ms 5412 KB Output is correct
15 Correct 73 ms 5464 KB Output is correct
16 Correct 61 ms 5424 KB Output is correct
17 Correct 67 ms 5348 KB Output is correct
18 Correct 63 ms 5452 KB Output is correct
19 Correct 62 ms 5440 KB Output is correct
20 Correct 63 ms 5388 KB Output is correct
21 Correct 63 ms 5440 KB Output is correct
22 Correct 62 ms 5440 KB Output is correct
23 Correct 68 ms 5432 KB Output is correct
24 Correct 62 ms 5408 KB Output is correct
25 Correct 73 ms 5456 KB Output is correct
26 Correct 67 ms 5356 KB Output is correct
27 Correct 63 ms 5388 KB Output is correct
28 Correct 62 ms 5436 KB Output is correct

Subtask #5
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 0 ms 212 KB Output is correct
8 Correct 0 ms 212 KB Output is correct
9 Correct 0 ms 212 KB Output is correct
10 Correct 0 ms 212 KB Output is correct
11 Correct 0 ms 212 KB Output is correct
12 Correct 1 ms 212 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 0 ms 212 KB Output is correct
16 Correct 0 ms 212 KB Output is correct
17 Correct 0 ms 212 KB Output is correct
18 Correct 0 ms 212 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 0 ms 340 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 1 ms 340 KB Output is correct
23 Correct 0 ms 340 KB Output is correct
24 Correct 1 ms 340 KB Output is correct
25 Correct 0 ms 340 KB Output is correct
26 Correct 0 ms 340 KB Output is correct
27 Correct 0 ms 340 KB Output is correct
28 Correct 0 ms 340 KB Output is correct
29 Correct 1 ms 340 KB Output is correct
30 Correct 1 ms 340 KB Output is correct
31 Correct 1 ms 340 KB Output is correct
32 Correct 0 ms 340 KB Output is correct
33 Correct 1 ms 340 KB Output is correct
34 Correct 1 ms 340 KB Output is correct
35 Correct 1 ms 340 KB Output is correct
36 Correct 70 ms 14600 KB Output is correct
37 Correct 66 ms 14972 KB Output is correct
38 Correct 67 ms 16624 KB Output is correct
39 Correct 62 ms 16620 KB Output is correct
40 Correct 83 ms 16660 KB Output is correct
41 Correct 67 ms 16732 KB Output is correct
42 Correct 55 ms 14020 KB Output is correct
43 Correct 48 ms 14000 KB Output is correct
44 Correct 46 ms 13960 KB Output is correct
45 Correct 66 ms 14100 KB Output is correct
46 Correct 57 ms 15644 KB Output is correct
47 Correct 92 ms 17424 KB Output is correct
48 Correct 37 ms 19020 KB Output is correct
49 Correct 38 ms 19032 KB Output is correct
50 Correct 44 ms 19028 KB Output is correct
51 Correct 39 ms 19144 KB Output is correct
52 Correct 38 ms 19056 KB Output is correct
53 Correct 39 ms 19080 KB Output is correct
54 Correct 38 ms 19016 KB Output is correct
55 Correct 41 ms 19008 KB Output is correct
56 Correct 53 ms 24148 KB Output is correct
57 Correct 62 ms 5464 KB Output is correct
58 Correct 63 ms 5448 KB Output is correct
59 Correct 67 ms 5444 KB Output is correct
60 Correct 66 ms 5416 KB Output is correct
61 Correct 62 ms 5452 KB Output is correct
62 Correct 69 ms 5440 KB Output is correct
63 Correct 63 ms 5416 KB Output is correct
64 Correct 62 ms 5404 KB Output is correct
65 Correct 62 ms 5416 KB Output is correct
66 Correct 61 ms 5448 KB Output is correct
67 Correct 63 ms 5428 KB Output is correct
68 Correct 62 ms 5468 KB Output is correct
69 Correct 63 ms 5448 KB Output is correct
70 Correct 66 ms 5412 KB Output is correct
71 Correct 73 ms 5464 KB Output is correct
72 Correct 61 ms 5424 KB Output is correct
73 Correct 67 ms 5348 KB Output is correct
74 Correct 63 ms 5452 KB Output is correct
75 Correct 62 ms 5440 KB Output is correct
76 Correct 63 ms 5388 KB Output is correct
77 Correct 63 ms 5440 KB Output is correct
78 Correct 62 ms 5440 KB Output is correct
79 Correct 68 ms 5432 KB Output is correct
80 Correct 62 ms 5408 KB Output is correct
81 Correct 73 ms 5456 KB Output is correct
82 Correct 67 ms 5356 KB Output is correct
83 Correct 63 ms 5388 KB Output is correct
84 Correct 62 ms 5436 KB Output is correct
85 Correct 61 ms 16460 KB Output is correct
86 Correct 54 ms 14944 KB Output is correct
87 Correct 60 ms 16628 KB Output is correct
88 Correct 62 ms 16628 KB Output is correct
89 Correct 60 ms 16696 KB Output is correct
90 Correct 78 ms 16620 KB Output is correct
91 Correct 55 ms 14012 KB Output is correct
92 Correct 73 ms 14036 KB Output is correct
93 Correct 50 ms 14028 KB Output is correct
94 Correct 47 ms 14052 KB Output is correct
95 Correct 63 ms 15768 KB Output is correct
96 Correct 76 ms 17344 KB Output is correct
97 Correct 102 ms 24216 KB Output is correct
98 Correct 101 ms 24192 KB Output is correct
99 Correct 99 ms 24224 KB Output is correct
100 Correct 102 ms 24180 KB Output is correct
101 Correct 101 ms 24124 KB Output is correct
102 Correct 105 ms 24192 KB Output is correct
103 Correct 99 ms 24176 KB Output is correct
104 Correct 100 ms 24184 KB Output is correct
105 Correct 103 ms 24144 KB Output is correct
106 Correct 101 ms 24188 KB Output is correct
107 Correct 100 ms 24132 KB Output is correct
108 Correct 97 ms 24132 KB Output is correct
109 Correct 99 ms 24120 KB Output is correct
110 Correct 102 ms 24192 KB Output is correct
111 Correct 103 ms 24168 KB Output is correct
112 Correct 103 ms 24132 KB Output is correct
113 Correct 59 ms 24036 KB Output is correct