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답안 #495675

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
495675 2021-12-20T01:25:36 Z minhcool Power Plant (JOI20_power) C++17
100 / 100
 176 ms 27460 KB 
#include<bits/stdc++.h>
using namespace std;

#define int long long
#define fi first
#define se second
#define pb push_back
#define mp make_pair
#define foru(i, l, r) for(int i = l; i <= r; i++)
#define ford(i, r, l) for(int i = r; i >= l; i--)

typedef pair<int, int> ii;
typedef pair<ii, int> iii;
typedef pair<ii, ii> iiii;

const int N = 2e5 + 5;

const int oo = 1e18 + 7, mod = 1e9 + 7;

int n;
bool plant[N];

vector<int> Adj[N];

/*
Basically, there are three main cases:
- Not choosing subtree of u (including u)
- Just choosing subtree of u
- Not just choosing subtree of u -> every node that is parent of at least one node in subtree u is broken
*/

int dp[N][2];// cases above (ofc first case -> 0)

int par[N];

void dfs(int u, int p){
	par[u] = p;
	for(auto v : Adj[u]){
		if(v == p) continue;
		dfs(v, u);
	}
	int mx = 0;
	for(auto v : Adj[u]){
		if(v == p) continue;
		dp[u][0] += max(dp[v][1], 0LL);// you can not choose anything in v
		mx = max(mx, dp[v][1]);
	}
	dp[u][0] -= plant[u];
	dp[u][0] = max(dp[u][0], mx + plant[u]);// just choosing one subtree of u => you can choose u 
	dp[u][1] = plant[u];// just choosing u
	int sum = 0;
	for(auto v : Adj[u]){
		if(v == p) continue;
		sum += max(0LL, dp[v][1]);
	}
	sum -= plant[u];
	dp[u][1] = max(dp[u][1], sum);
}

void process(){
	cin >> n;
	for(int i = 1; i < n; i++){
		int x, y;
		cin >> x >> y;
		Adj[x].pb(y);
		Adj[y].pb(x);
	}
	string s;
	cin >> s;
	for(int i = 1; i <= n; i++) plant[i] = s[i - 1] - '0';
	dfs(1, 1);
	int mx = -1;
	for(int i = 1; i <= n; i++) mx = max(mx, dp[i][0]);
	cout << mx;
}

signed main(){
	ios_base::sync_with_stdio(0);
	process();
}

Subtask #1
6.0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5024 KB Output is correct
2 Correct 3 ms 4944 KB Output is correct
3 Correct 3 ms 4944 KB Output is correct
4 Correct 3 ms 4944 KB Output is correct
5 Correct 3 ms 4944 KB Output is correct
6 Correct 3 ms 5024 KB Output is correct
7 Correct 4 ms 5072 KB Output is correct
8 Correct 3 ms 5024 KB Output is correct
9 Correct 3 ms 4944 KB Output is correct
10 Correct 3 ms 5028 KB Output is correct
11 Correct 3 ms 4944 KB Output is correct
12 Correct 3 ms 4944 KB Output is correct
13 Correct 3 ms 4944 KB Output is correct
14 Correct 3 ms 4944 KB Output is correct
15 Correct 3 ms 5024 KB Output is correct
16 Correct 3 ms 4944 KB Output is correct
17 Correct 3 ms 4944 KB Output is correct
18 Correct 3 ms 5020 KB Output is correct
19 Correct 3 ms 4944 KB Output is correct
20 Correct 3 ms 4944 KB Output is correct
21 Correct 3 ms 4944 KB Output is correct

Subtask #2
41.0 / 41.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5024 KB Output is correct
2 Correct 3 ms 4944 KB Output is correct
3 Correct 3 ms 4944 KB Output is correct
4 Correct 3 ms 4944 KB Output is correct
5 Correct 3 ms 4944 KB Output is correct
6 Correct 3 ms 5024 KB Output is correct
7 Correct 4 ms 5072 KB Output is correct
8 Correct 3 ms 5024 KB Output is correct
9 Correct 3 ms 4944 KB Output is correct
10 Correct 3 ms 5028 KB Output is correct
11 Correct 3 ms 4944 KB Output is correct
12 Correct 3 ms 4944 KB Output is correct
13 Correct 3 ms 4944 KB Output is correct
14 Correct 3 ms 4944 KB Output is correct
15 Correct 3 ms 5024 KB Output is correct
16 Correct 3 ms 4944 KB Output is correct
17 Correct 3 ms 4944 KB Output is correct
18 Correct 3 ms 5020 KB Output is correct
19 Correct 3 ms 4944 KB Output is correct
20 Correct 3 ms 4944 KB Output is correct
21 Correct 3 ms 4944 KB Output is correct
22 Correct 4 ms 5092 KB Output is correct
23 Correct 4 ms 5072 KB Output is correct
24 Correct 4 ms 5072 KB Output is correct
25 Correct 3 ms 5072 KB Output is correct
26 Correct 4 ms 5072 KB Output is correct
27 Correct 4 ms 5072 KB Output is correct
28 Correct 3 ms 5168 KB Output is correct
29 Correct 4 ms 5200 KB Output is correct
30 Correct 3 ms 5160 KB Output is correct
31 Correct 3 ms 5160 KB Output is correct
32 Correct 3 ms 5072 KB Output is correct
33 Correct 3 ms 5172 KB Output is correct
34 Correct 4 ms 5164 KB Output is correct
35 Correct 4 ms 5072 KB Output is correct
36 Correct 4 ms 5164 KB Output is correct
37 Correct 3 ms 5072 KB Output is correct
38 Correct 4 ms 5072 KB Output is correct
39 Correct 3 ms 5200 KB Output is correct
40 Correct 3 ms 5072 KB Output is correct
41 Correct 4 ms 5200 KB Output is correct
42 Correct 4 ms 5072 KB Output is correct
43 Correct 4 ms 5072 KB Output is correct
44 Correct 4 ms 5072 KB Output is correct
45 Correct 3 ms 5072 KB Output is correct
46 Correct 3 ms 5072 KB Output is correct
47 Correct 4 ms 5072 KB Output is correct
48 Correct 4 ms 5160 KB Output is correct
49 Correct 4 ms 5200 KB Output is correct
50 Correct 3 ms 5072 KB Output is correct
51 Correct 4 ms 5072 KB Output is correct
52 Correct 3 ms 5164 KB Output is correct
53 Correct 3 ms 5072 KB Output is correct
54 Correct 3 ms 5072 KB Output is correct
55 Correct 4 ms 5164 KB Output is correct
56 Correct 3 ms 5072 KB Output is correct
57 Correct 4 ms 5164 KB Output is correct
58 Correct 3 ms 5072 KB Output is correct
59 Correct 4 ms 5072 KB Output is correct
60 Correct 4 ms 5200 KB Output is correct
61 Correct 4 ms 5140 KB Output is correct
62 Correct 4 ms 5200 KB Output is correct
63 Correct 4 ms 5024 KB Output is correct

Subtask #3
53.0 / 53.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 5024 KB Output is correct
2 Correct 3 ms 4944 KB Output is correct
3 Correct 3 ms 4944 KB Output is correct
4 Correct 3 ms 4944 KB Output is correct
5 Correct 3 ms 4944 KB Output is correct
6 Correct 3 ms 5024 KB Output is correct
7 Correct 4 ms 5072 KB Output is correct
8 Correct 3 ms 5024 KB Output is correct
9 Correct 3 ms 4944 KB Output is correct
10 Correct 3 ms 5028 KB Output is correct
11 Correct 3 ms 4944 KB Output is correct
12 Correct 3 ms 4944 KB Output is correct
13 Correct 3 ms 4944 KB Output is correct
14 Correct 3 ms 4944 KB Output is correct
15 Correct 3 ms 5024 KB Output is correct
16 Correct 3 ms 4944 KB Output is correct
17 Correct 3 ms 4944 KB Output is correct
18 Correct 3 ms 5020 KB Output is correct
19 Correct 3 ms 4944 KB Output is correct
20 Correct 3 ms 4944 KB Output is correct
21 Correct 3 ms 4944 KB Output is correct
22 Correct 4 ms 5092 KB Output is correct
23 Correct 4 ms 5072 KB Output is correct
24 Correct 4 ms 5072 KB Output is correct
25 Correct 3 ms 5072 KB Output is correct
26 Correct 4 ms 5072 KB Output is correct
27 Correct 4 ms 5072 KB Output is correct
28 Correct 3 ms 5168 KB Output is correct
29 Correct 4 ms 5200 KB Output is correct
30 Correct 3 ms 5160 KB Output is correct
31 Correct 3 ms 5160 KB Output is correct
32 Correct 3 ms 5072 KB Output is correct
33 Correct 3 ms 5172 KB Output is correct
34 Correct 4 ms 5164 KB Output is correct
35 Correct 4 ms 5072 KB Output is correct
36 Correct 4 ms 5164 KB Output is correct
37 Correct 3 ms 5072 KB Output is correct
38 Correct 4 ms 5072 KB Output is correct
39 Correct 3 ms 5200 KB Output is correct
40 Correct 3 ms 5072 KB Output is correct
41 Correct 4 ms 5200 KB Output is correct
42 Correct 4 ms 5072 KB Output is correct
43 Correct 4 ms 5072 KB Output is correct
44 Correct 4 ms 5072 KB Output is correct
45 Correct 3 ms 5072 KB Output is correct
46 Correct 3 ms 5072 KB Output is correct
47 Correct 4 ms 5072 KB Output is correct
48 Correct 4 ms 5160 KB Output is correct
49 Correct 4 ms 5200 KB Output is correct
50 Correct 3 ms 5072 KB Output is correct
51 Correct 4 ms 5072 KB Output is correct
52 Correct 3 ms 5164 KB Output is correct
53 Correct 3 ms 5072 KB Output is correct
54 Correct 3 ms 5072 KB Output is correct
55 Correct 4 ms 5164 KB Output is correct
56 Correct 3 ms 5072 KB Output is correct
57 Correct 4 ms 5164 KB Output is correct
58 Correct 3 ms 5072 KB Output is correct
59 Correct 4 ms 5072 KB Output is correct
60 Correct 4 ms 5200 KB Output is correct
61 Correct 4 ms 5140 KB Output is correct
62 Correct 4 ms 5200 KB Output is correct
63 Correct 4 ms 5024 KB Output is correct
64 Correct 131 ms 20276 KB Output is correct
65 Correct 127 ms 20256 KB Output is correct
66 Correct 160 ms 20356 KB Output is correct
67 Correct 143 ms 20356 KB Output is correct
68 Correct 126 ms 20196 KB Output is correct
69 Correct 138 ms 20188 KB Output is correct
70 Correct 138 ms 20304 KB Output is correct
71 Correct 139 ms 20244 KB Output is correct
72 Correct 175 ms 20276 KB Output is correct
73 Correct 148 ms 26792 KB Output is correct
74 Correct 145 ms 26732 KB Output is correct
75 Correct 153 ms 21488 KB Output is correct
76 Correct 144 ms 21516 KB Output is correct
77 Correct 160 ms 20152 KB Output is correct
78 Correct 157 ms 20216 KB Output is correct
79 Correct 153 ms 20208 KB Output is correct
80 Correct 153 ms 20236 KB Output is correct
81 Correct 128 ms 20280 KB Output is correct
82 Correct 117 ms 20276 KB Output is correct
83 Correct 144 ms 23300 KB Output is correct
84 Correct 176 ms 24616 KB Output is correct
85 Correct 156 ms 24444 KB Output is correct
86 Correct 168 ms 21048 KB Output is correct
87 Correct 145 ms 20740 KB Output is correct
88 Correct 148 ms 20892 KB Output is correct
89 Correct 125 ms 20892 KB Output is correct
90 Correct 121 ms 20716 KB Output is correct
91 Correct 128 ms 20916 KB Output is correct
92 Correct 150 ms 21128 KB Output is correct
93 Correct 147 ms 22200 KB Output is correct
94 Correct 110 ms 23228 KB Output is correct
95 Correct 136 ms 22552 KB Output is correct
96 Correct 137 ms 21472 KB Output is correct
97 Correct 135 ms 20536 KB Output is correct
98 Correct 129 ms 20440 KB Output is correct
99 Correct 144 ms 20320 KB Output is correct
100 Correct 125 ms 21952 KB Output is correct
101 Correct 147 ms 20740 KB Output is correct
102 Correct 140 ms 20412 KB Output is correct
103 Correct 127 ms 20468 KB Output is correct
104 Correct 89 ms 20892 KB Output is correct
105 Correct 144 ms 24800 KB Output is correct
106 Correct 82 ms 20788 KB Output is correct
107 Correct 72 ms 20740 KB Output is correct
108 Correct 148 ms 27272 KB Output is correct
109 Correct 84 ms 21036 KB Output is correct
110 Correct 165 ms 27460 KB Output is correct
111 Correct 129 ms 20220 KB Output is correct