#include <bits/stdc++.h>
using namespace std;
#define scd(t) scanf("%d", &t)
#define sclld(t) scanf("%lld", &t)
#define forr(i, j, k) for(int i=j; i<k; i++)
#define frange(i, k) forr(i, 0, k)
#define mp make_pair
#define pb push_back
#define all(vec) vec.begin(), vec.end()
#define f first
#define s second
typedef long long lli;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<pii> vii;
typedef vector<vi> vvi;
typedef vector<bool> vb;
typedef map<int, int> mpii;
typedef set<int> seti;
typedef vector<lli> vll;
typedef long double ld;
void fastio() {
ios_base::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
}
void usaco() {
freopen("/home/student_visitors/v_hari_aakash_k/Desktop/IOITC_practice/input.in", "r", stdin);
}
vvi graph;
vi dp1, dp2;
vi plt;
void dfs(int x, int p) {
vi v1, v2;
int t1 = 0, t2 = 0;
for(auto e : graph[x]) {
if(e != p) {
dfs(e, x);
v1.pb(dp1[e]);
v2.pb(dp2[e]);
t1 += dp1[e];
t2 += dp2[e];
}
}
sort(all(v1), greater<>());
sort(all(v2), greater<>());
dp1[x] = dp2[x] = plt[x];
if(v1.size()) {
dp1[x] = max({dp1[x], v2[0] + plt[x], t2 - plt[x]});
dp2[x] = max({dp2[x], v2[0] - plt[x], t2 - plt[x]});
}
// printf("%d %d %d\n", x, dp1[x], dp2[x]);
}
int main() {
// usaco();
fastio();
int n;
cin >> n;
graph = vvi(n+1);
frange(i, n-1) {
int a, b;
cin >> a >> b;
graph[a].pb(b);
graph[b].pb(a);
}
string str;
cin >> str;
dp1 = dp2 = plt = vi(n+1);
forr(i, 1, n+1) {
plt[i] = (str[i-1] - '0');
}
dfs(1, 0);
printf("%d\n", dp1[1]);
}
Compilation message
power.cpp: In function 'void usaco()':
power.cpp:34:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
34 | freopen("/home/student_visitors/v_hari_aakash_k/Desktop/IOITC_practice/input.in", "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
348 KB |
Output is correct |
2 |
Correct |
0 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
464 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Incorrect |
1 ms |
348 KB |
Output isn't correct |
8 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
348 KB |
Output is correct |
2 |
Correct |
0 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
464 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Incorrect |
1 ms |
348 KB |
Output isn't correct |
8 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
348 KB |
Output is correct |
2 |
Correct |
0 ms |
348 KB |
Output is correct |
3 |
Correct |
0 ms |
464 KB |
Output is correct |
4 |
Correct |
0 ms |
348 KB |
Output is correct |
5 |
Correct |
0 ms |
348 KB |
Output is correct |
6 |
Correct |
0 ms |
348 KB |
Output is correct |
7 |
Incorrect |
1 ms |
348 KB |
Output isn't correct |
8 |
Halted |
0 ms |
0 KB |
- |