oj.uz

Submission #294255

# Submission time Handle Problem Language Result Execution time Memory
294255 2020-09-08T18:11:53 Z wilwxk Power Plant (JOI20_power) C++17
100 / 100
 273 ms 27280 KB 
#include <bits/stdc++.h>
using namespace std;

const int MAXN = 2e5+5;
vector<int> g[MAXN];
char special[MAXN];
int subsum[MAXN], dp[MAXN];
int n, ans;

void predfs(int u, int p) {
	for (auto v : g[u]) {
		if (v == p) continue;
		predfs(v, u);
		subsum[u] += dp[v];
	}
	dp[u] = subsum[u];
	if (special[u] == '1') dp[u] = max(dp[u]-1, 1); 
	// printf("idp %d %d\n", u, dp[u]);
}

void dfs(int u, int p) {
	if (special[u] == '1') {
		int cnt = 0;
		for (auto v : g[u]) cnt += dp[v] != 0;
		if (cnt <= 1) ans = max(subsum[u]+1, ans);
		else ans = max(dp[u], ans);
	}
	else {
		ans = max(ans, dp[u]);
	}
	// printf("dp %d %d %d %d\n", u, dp[u], subsum[u], ans);
	for (auto v : g[u]) {
		if (v == p) continue;

		int subu = subsum[u];
		int subv = subsum[v];
		int dpu = dp[u];
		int dpv = dp[v];
		
		subsum[u] -= dp[v];
		dp[u] = subsum[u];
		if (special[u] == '1') dp[u] = max(dp[u]-1, 1);
		subsum[v] += dp[u];
		dp[v] = subsum[v];
		if (special[v] == '1') dp[v] = max(dp[v]-1, 1);

		dfs(v, u);

		subsum[u] = subu;
		subsum[v] = subv;
		dp[u] = dpu;
		dp[v] = dpv;
	}
}

int main() {
	scanf("%d", &n);
	for(int i = 1; i <= n-1; i++) {
		int a, b;
		scanf("%d %d", &a, &b);
		g[a].push_back(b);
		g[b].push_back(a);
	}
	scanf(" %s", &special[1]);

	predfs(1, 1);
	dfs(1, 1);

	printf("%d\n", ans);
}

Compilation message

power.cpp: In function 'int main()':
power.cpp:57:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   57 |  scanf("%d", &n);
      |  ~~~~~^~~~~~~~~~
power.cpp:60:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   60 |   scanf("%d %d", &a, &b);
      |   ~~~~~^~~~~~~~~~~~~~~~~
power.cpp:64:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   64 |  scanf(" %s", &special[1]);
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~

Subtask #1
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4992 KB Output is correct
2 Correct 3 ms 4992 KB Output is correct
3 Correct 3 ms 4992 KB Output is correct
4 Correct 4 ms 4992 KB Output is correct
5 Correct 3 ms 4992 KB Output is correct
6 Correct 3 ms 4992 KB Output is correct
7 Correct 3 ms 4992 KB Output is correct
8 Correct 4 ms 4992 KB Output is correct
9 Correct 4 ms 4992 KB Output is correct
10 Correct 3 ms 4992 KB Output is correct
11 Correct 4 ms 4992 KB Output is correct
12 Correct 4 ms 4992 KB Output is correct
13 Correct 3 ms 4992 KB Output is correct
14 Correct 3 ms 4992 KB Output is correct
15 Correct 4 ms 4992 KB Output is correct
16 Correct 3 ms 4992 KB Output is correct
17 Correct 4 ms 4992 KB Output is correct
18 Correct 4 ms 4992 KB Output is correct
19 Correct 3 ms 4992 KB Output is correct
20 Correct 3 ms 4992 KB Output is correct
21 Correct 4 ms 4992 KB Output is correct

Subtask #2
41.0 / 41.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4992 KB Output is correct
2 Correct 3 ms 4992 KB Output is correct
3 Correct 3 ms 4992 KB Output is correct
4 Correct 4 ms 4992 KB Output is correct
5 Correct 3 ms 4992 KB Output is correct
6 Correct 3 ms 4992 KB Output is correct
7 Correct 3 ms 4992 KB Output is correct
8 Correct 4 ms 4992 KB Output is correct
9 Correct 4 ms 4992 KB Output is correct
10 Correct 3 ms 4992 KB Output is correct
11 Correct 4 ms 4992 KB Output is correct
12 Correct 4 ms 4992 KB Output is correct
13 Correct 3 ms 4992 KB Output is correct
14 Correct 3 ms 4992 KB Output is correct
15 Correct 4 ms 4992 KB Output is correct
16 Correct 3 ms 4992 KB Output is correct
17 Correct 4 ms 4992 KB Output is correct
18 Correct 4 ms 4992 KB Output is correct
19 Correct 3 ms 4992 KB Output is correct
20 Correct 3 ms 4992 KB Output is correct
21 Correct 4 ms 4992 KB Output is correct
22 Correct 5 ms 5120 KB Output is correct
23 Correct 5 ms 5120 KB Output is correct
24 Correct 5 ms 5120 KB Output is correct
25 Correct 5 ms 5120 KB Output is correct
26 Correct 5 ms 5084 KB Output is correct
27 Correct 5 ms 5120 KB Output is correct
28 Correct 5 ms 5120 KB Output is correct
29 Correct 5 ms 5248 KB Output is correct
30 Correct 5 ms 5248 KB Output is correct
31 Correct 5 ms 5120 KB Output is correct
32 Correct 5 ms 5120 KB Output is correct
33 Correct 5 ms 5120 KB Output is correct
34 Correct 4 ms 5120 KB Output is correct
35 Correct 5 ms 5120 KB Output is correct
36 Correct 5 ms 5120 KB Output is correct
37 Correct 5 ms 5120 KB Output is correct
38 Correct 5 ms 5120 KB Output is correct
39 Correct 6 ms 5120 KB Output is correct
40 Correct 5 ms 5120 KB Output is correct
41 Correct 5 ms 5120 KB Output is correct
42 Correct 5 ms 5120 KB Output is correct
43 Correct 5 ms 5120 KB Output is correct
44 Correct 4 ms 5120 KB Output is correct
45 Correct 5 ms 5120 KB Output is correct
46 Correct 5 ms 5120 KB Output is correct
47 Correct 5 ms 5120 KB Output is correct
48 Correct 5 ms 5248 KB Output is correct
49 Correct 5 ms 5248 KB Output is correct
50 Correct 5 ms 5120 KB Output is correct
51 Correct 4 ms 5120 KB Output is correct
52 Correct 5 ms 5120 KB Output is correct
53 Correct 5 ms 5120 KB Output is correct
54 Correct 5 ms 5120 KB Output is correct
55 Correct 5 ms 5120 KB Output is correct
56 Correct 4 ms 5120 KB Output is correct
57 Correct 5 ms 5248 KB Output is correct
58 Correct 5 ms 5076 KB Output is correct
59 Correct 4 ms 5120 KB Output is correct
60 Correct 4 ms 5248 KB Output is correct
61 Correct 4 ms 5120 KB Output is correct
62 Correct 6 ms 5248 KB Output is correct
63 Correct 5 ms 5120 KB Output is correct

Subtask #3
53.0 / 53.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4992 KB Output is correct
2 Correct 3 ms 4992 KB Output is correct
3 Correct 3 ms 4992 KB Output is correct
4 Correct 4 ms 4992 KB Output is correct
5 Correct 3 ms 4992 KB Output is correct
6 Correct 3 ms 4992 KB Output is correct
7 Correct 3 ms 4992 KB Output is correct
8 Correct 4 ms 4992 KB Output is correct
9 Correct 4 ms 4992 KB Output is correct
10 Correct 3 ms 4992 KB Output is correct
11 Correct 4 ms 4992 KB Output is correct
12 Correct 4 ms 4992 KB Output is correct
13 Correct 3 ms 4992 KB Output is correct
14 Correct 3 ms 4992 KB Output is correct
15 Correct 4 ms 4992 KB Output is correct
16 Correct 3 ms 4992 KB Output is correct
17 Correct 4 ms 4992 KB Output is correct
18 Correct 4 ms 4992 KB Output is correct
19 Correct 3 ms 4992 KB Output is correct
20 Correct 3 ms 4992 KB Output is correct
21 Correct 4 ms 4992 KB Output is correct
22 Correct 5 ms 5120 KB Output is correct
23 Correct 5 ms 5120 KB Output is correct
24 Correct 5 ms 5120 KB Output is correct
25 Correct 5 ms 5120 KB Output is correct
26 Correct 5 ms 5084 KB Output is correct
27 Correct 5 ms 5120 KB Output is correct
28 Correct 5 ms 5120 KB Output is correct
29 Correct 5 ms 5248 KB Output is correct
30 Correct 5 ms 5248 KB Output is correct
31 Correct 5 ms 5120 KB Output is correct
32 Correct 5 ms 5120 KB Output is correct
33 Correct 5 ms 5120 KB Output is correct
34 Correct 4 ms 5120 KB Output is correct
35 Correct 5 ms 5120 KB Output is correct
36 Correct 5 ms 5120 KB Output is correct
37 Correct 5 ms 5120 KB Output is correct
38 Correct 5 ms 5120 KB Output is correct
39 Correct 6 ms 5120 KB Output is correct
40 Correct 5 ms 5120 KB Output is correct
41 Correct 5 ms 5120 KB Output is correct
42 Correct 5 ms 5120 KB Output is correct
43 Correct 5 ms 5120 KB Output is correct
44 Correct 4 ms 5120 KB Output is correct
45 Correct 5 ms 5120 KB Output is correct
46 Correct 5 ms 5120 KB Output is correct
47 Correct 5 ms 5120 KB Output is correct
48 Correct 5 ms 5248 KB Output is correct
49 Correct 5 ms 5248 KB Output is correct
50 Correct 5 ms 5120 KB Output is correct
51 Correct 4 ms 5120 KB Output is correct
52 Correct 5 ms 5120 KB Output is correct
53 Correct 5 ms 5120 KB Output is correct
54 Correct 5 ms 5120 KB Output is correct
55 Correct 5 ms 5120 KB Output is correct
56 Correct 4 ms 5120 KB Output is correct
57 Correct 5 ms 5248 KB Output is correct
58 Correct 5 ms 5076 KB Output is correct
59 Correct 4 ms 5120 KB Output is correct
60 Correct 4 ms 5248 KB Output is correct
61 Correct 4 ms 5120 KB Output is correct
62 Correct 6 ms 5248 KB Output is correct
63 Correct 5 ms 5120 KB Output is correct
64 Correct 255 ms 13688 KB Output is correct
65 Correct 242 ms 13816 KB Output is correct
66 Correct 255 ms 13816 KB Output is correct
67 Correct 250 ms 13688 KB Output is correct
68 Correct 257 ms 13688 KB Output is correct
69 Correct 234 ms 13760 KB Output is correct
70 Correct 222 ms 13688 KB Output is correct
71 Correct 233 ms 13688 KB Output is correct
72 Correct 231 ms 13820 KB Output is correct
73 Correct 254 ms 26232 KB Output is correct
74 Correct 260 ms 26232 KB Output is correct
75 Correct 228 ms 13560 KB Output is correct
76 Correct 229 ms 13688 KB Output is correct
77 Correct 247 ms 13572 KB Output is correct
78 Correct 244 ms 13560 KB Output is correct
79 Correct 236 ms 13688 KB Output is correct
80 Correct 235 ms 13560 KB Output is correct
81 Correct 181 ms 13936 KB Output is correct
82 Correct 226 ms 13832 KB Output is correct
83 Correct 266 ms 18804 KB Output is correct
84 Correct 237 ms 20984 KB Output is correct
85 Correct 243 ms 20632 KB Output is correct
86 Correct 242 ms 14968 KB Output is correct
87 Correct 233 ms 14364 KB Output is correct
88 Correct 252 ms 14904 KB Output is correct
89 Correct 209 ms 14840 KB Output is correct
90 Correct 226 ms 14712 KB Output is correct
91 Correct 226 ms 14840 KB Output is correct
92 Correct 210 ms 15224 KB Output is correct
93 Correct 223 ms 17676 KB Output is correct
94 Correct 217 ms 19440 KB Output is correct
95 Correct 209 ms 18036 KB Output is correct
96 Correct 218 ms 16248 KB Output is correct
97 Correct 217 ms 14584 KB Output is correct
98 Correct 210 ms 14328 KB Output is correct
99 Correct 240 ms 13816 KB Output is correct
100 Correct 215 ms 17016 KB Output is correct
101 Correct 210 ms 14968 KB Output is correct
102 Correct 212 ms 14328 KB Output is correct
103 Correct 251 ms 14072 KB Output is correct
104 Correct 126 ms 14188 KB Output is correct
105 Correct 262 ms 22904 KB Output is correct
106 Correct 135 ms 14188 KB Output is correct
107 Correct 134 ms 14160 KB Output is correct
108 Correct 272 ms 26872 KB Output is correct
109 Correct 122 ms 14184 KB Output is correct
110 Correct 273 ms 27280 KB Output is correct
111 Correct 208 ms 13560 KB Output is correct