#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]);
| ~~~~~^~~~~~~~~~~~~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
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 |
| # |
결과 |
실행 시간 |
메모리 |
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 |
| # |
결과 |
실행 시간 |
메모리 |
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 |
