oj.uz

Submission #294117

# Submission time Handle Problem Language Result Execution time Memory
294117 2020-09-08T15:37:16 Z BThero Power Plant (JOI20_power) C++17
100 / 100
 311 ms 43384 KB 
// chrono::system_clock::now().time_since_epoch().count()
#include<bits/stdc++.h>

#define pb push_back
#define eb emplace_back
#define mp make_pair
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()
#define debug(x) cerr << #x << " = " << x << endl;

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;

const int MAXN = (int)2e5 + 5;

vector<int> adj[MAXN];
char can[MAXN];
int dp[MAXN], dpUp[MAXN];
int n, ans;

void dfs(int v, int pr = -1) {
  int S = 0;

  for (int to : adj[v]) {
    if (to != pr) {
      dfs(to, v);
      S += dp[to];
    }
  }
  
  if (can[v] == '1') {
    dp[v] = max(1, S - 1);
  }
  else {
    dp[v] = S;
  }
}

void dfs2(int v, int pr = -1) {
  int S = dpUp[v];
  vector<int> sons;

  for (int to : adj[v]) {
    if (to != pr) {
      sons.pb(to);
      S += dp[to];
    }
  }
  
  if (can[v] == '1') {
    ans = max(ans, max(1, S - 1));
  }
  else {
    ans = max(ans, S);
  }
  
  for (int to : sons) {
    S -= dp[to];
    
    if (can[v] == '1') {
      dpUp[to] = max(1, S - 1);
    }
    else {
      dpUp[to] = S;
    }
    
    dfs2(to, v);
    S += dp[to];
  }
}

void solve() {
  scanf("%d", &n);
  
  for (int i = 1; i < n; ++i) {
    int u, v;
    scanf("%d %d", &u, &v);
    adj[u].pb(v);
    adj[v].pb(u);
  }
  
  scanf("%s", can + 1);
  ans = 0;
  
  for (int i = 1; i <= n; ++i) {
    if (can[i] == '1') {
      ans++;
    }
  }
  
  ans = min(ans, 2);
  dfs(1);
  dfs2(1);  
  printf("%d\n", ans);
}

int main() {
  int tt = 1;
  
  while (tt--) {
    solve();
  }

  return 0;
}

Compilation message

power.cpp: In function 'void solve()':
power.cpp:76:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   76 |   scanf("%d", &n);
      |   ~~~~~^~~~~~~~~~
power.cpp:80:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   80 |     scanf("%d %d", &u, &v);
      |     ~~~~~^~~~~~~~~~~~~~~~~
power.cpp:85:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   85 |   scanf("%s", can + 1);
      |   ~~~~~^~~~~~~~~~~~~~~

Subtask #1
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 4992 KB Output is correct
2 Correct 3 ms 4992 KB Output is correct
3 Correct 4 ms 4992 KB Output is correct
4 Correct 4 ms 5024 KB Output is correct
5 Correct 4 ms 5024 KB Output is correct
6 Correct 4 ms 4992 KB Output is correct
7 Correct 4 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 4 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 4 ms 4992 KB Output is correct
14 Correct 5 ms 4992 KB Output is correct
15 Correct 4 ms 4992 KB Output is correct
16 Correct 4 ms 4992 KB Output is correct
17 Correct 3 ms 4992 KB Output is correct
18 Correct 4 ms 4992 KB Output is correct
19 Correct 4 ms 4992 KB Output is correct
20 Correct 4 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 4 ms 4992 KB Output is correct
2 Correct 3 ms 4992 KB Output is correct
3 Correct 4 ms 4992 KB Output is correct
4 Correct 4 ms 5024 KB Output is correct
5 Correct 4 ms 5024 KB Output is correct
6 Correct 4 ms 4992 KB Output is correct
7 Correct 4 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 4 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 4 ms 4992 KB Output is correct
14 Correct 5 ms 4992 KB Output is correct
15 Correct 4 ms 4992 KB Output is correct
16 Correct 4 ms 4992 KB Output is correct
17 Correct 3 ms 4992 KB Output is correct
18 Correct 4 ms 4992 KB Output is correct
19 Correct 4 ms 4992 KB Output is correct
20 Correct 4 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 5248 KB Output is correct
24 Correct 6 ms 5120 KB Output is correct
25 Correct 5 ms 5120 KB Output is correct
26 Correct 5 ms 5120 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 5376 KB Output is correct
30 Correct 6 ms 5248 KB Output is correct
31 Correct 5 ms 5152 KB Output is correct
32 Correct 5 ms 5120 KB Output is correct
33 Correct 6 ms 5148 KB Output is correct
34 Correct 5 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 4 ms 5120 KB Output is correct
38 Correct 5 ms 5120 KB Output is correct
39 Correct 5 ms 5344 KB Output is correct
40 Correct 5 ms 5248 KB Output is correct
41 Correct 5 ms 5248 KB Output is correct
42 Correct 5 ms 5120 KB Output is correct
43 Correct 5 ms 5120 KB Output is correct
44 Correct 5 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 5248 KB Output is correct
51 Correct 5 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 6 ms 5376 KB Output is correct
58 Correct 4 ms 5120 KB Output is correct
59 Correct 5 ms 5120 KB Output is correct
60 Correct 5 ms 5248 KB Output is correct
61 Correct 4 ms 5120 KB Output is correct
62 Correct 5 ms 5376 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 4 ms 4992 KB Output is correct
2 Correct 3 ms 4992 KB Output is correct
3 Correct 4 ms 4992 KB Output is correct
4 Correct 4 ms 5024 KB Output is correct
5 Correct 4 ms 5024 KB Output is correct
6 Correct 4 ms 4992 KB Output is correct
7 Correct 4 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 4 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 4 ms 4992 KB Output is correct
14 Correct 5 ms 4992 KB Output is correct
15 Correct 4 ms 4992 KB Output is correct
16 Correct 4 ms 4992 KB Output is correct
17 Correct 3 ms 4992 KB Output is correct
18 Correct 4 ms 4992 KB Output is correct
19 Correct 4 ms 4992 KB Output is correct
20 Correct 4 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 5248 KB Output is correct
24 Correct 6 ms 5120 KB Output is correct
25 Correct 5 ms 5120 KB Output is correct
26 Correct 5 ms 5120 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 5376 KB Output is correct
30 Correct 6 ms 5248 KB Output is correct
31 Correct 5 ms 5152 KB Output is correct
32 Correct 5 ms 5120 KB Output is correct
33 Correct 6 ms 5148 KB Output is correct
34 Correct 5 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 4 ms 5120 KB Output is correct
38 Correct 5 ms 5120 KB Output is correct
39 Correct 5 ms 5344 KB Output is correct
40 Correct 5 ms 5248 KB Output is correct
41 Correct 5 ms 5248 KB Output is correct
42 Correct 5 ms 5120 KB Output is correct
43 Correct 5 ms 5120 KB Output is correct
44 Correct 5 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 5248 KB Output is correct
51 Correct 5 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 6 ms 5376 KB Output is correct
58 Correct 4 ms 5120 KB Output is correct
59 Correct 5 ms 5120 KB Output is correct
60 Correct 5 ms 5248 KB Output is correct
61 Correct 4 ms 5120 KB Output is correct
62 Correct 5 ms 5376 KB Output is correct
63 Correct 5 ms 5120 KB Output is correct
64 Correct 250 ms 15868 KB Output is correct
65 Correct 258 ms 16120 KB Output is correct
66 Correct 294 ms 15992 KB Output is correct
67 Correct 233 ms 15864 KB Output is correct
68 Correct 241 ms 16120 KB Output is correct
69 Correct 236 ms 15864 KB Output is correct
70 Correct 247 ms 15992 KB Output is correct
71 Correct 250 ms 15992 KB Output is correct
72 Correct 236 ms 15864 KB Output is correct
73 Correct 311 ms 41468 KB Output is correct
74 Correct 282 ms 41080 KB Output is correct
75 Correct 235 ms 15992 KB Output is correct
76 Correct 234 ms 15864 KB Output is correct
77 Correct 258 ms 15736 KB Output is correct
78 Correct 256 ms 15992 KB Output is correct
79 Correct 247 ms 15736 KB Output is correct
80 Correct 251 ms 15864 KB Output is correct
81 Correct 196 ms 16624 KB Output is correct
82 Correct 227 ms 16372 KB Output is correct
83 Correct 273 ms 26232 KB Output is correct
84 Correct 269 ms 30456 KB Output is correct
85 Correct 271 ms 29944 KB Output is correct
86 Correct 247 ms 18552 KB Output is correct
87 Correct 257 ms 17400 KB Output is correct
88 Correct 236 ms 18040 KB Output is correct
89 Correct 223 ms 17880 KB Output is correct
90 Correct 226 ms 17448 KB Output is correct
91 Correct 228 ms 18164 KB Output is correct
92 Correct 223 ms 18644 KB Output is correct
93 Correct 221 ms 24016 KB Output is correct
94 Correct 231 ms 27048 KB Output is correct
95 Correct 214 ms 24604 KB Output is correct
96 Correct 215 ms 20840 KB Output is correct
97 Correct 218 ms 17620 KB Output is correct
98 Correct 217 ms 16504 KB Output is correct
99 Correct 223 ms 16376 KB Output is correct
100 Correct 224 ms 22904 KB Output is correct
101 Correct 225 ms 18620 KB Output is correct
102 Correct 227 ms 17144 KB Output is correct
103 Correct 230 ms 16504 KB Output is correct
104 Correct 120 ms 17512 KB Output is correct
105 Correct 286 ms 34936 KB Output is correct
106 Correct 124 ms 17384 KB Output is correct
107 Correct 121 ms 17384 KB Output is correct
108 Correct 282 ms 42872 KB Output is correct
109 Correct 124 ms 17512 KB Output is correct
110 Correct 276 ms 43384 KB Output is correct
111 Correct 220 ms 15992 KB Output is correct