oj.uz

Submission #614244

# Submission time Handle Problem Language Result Execution time Memory
614244 2022-07-30T23:14:25 Z Plurm Stranded Far From Home (BOI22_island) C++11
10 / 100
 370 ms 16328 KB 
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
using namespace std;

int s[200005];
vector<int> g[200005];
int n, m;
bool check(int u) {
  priority_queue<pair<int, int>> pq;
  long long allies = s[u];
  gp_hash_table<int, null_type> alliance;
  alliance.insert(u);
  for (int v : g[u])
    pq.push({-s[v], v});
  while (!pq.empty()) {
    int vnxt = pq.top().second;
    pq.pop();
    if (alliance.find(vnxt) != alliance.end())
      continue;
    if (s[vnxt] <= allies) {
      allies += 1ll * s[vnxt];
      alliance.insert(vnxt);
      for (int v : g[vnxt]) {
        if (alliance.find(v) == alliance.end()) {
          pq.push({-s[v], v});
        }
      }
    } else {
      return false;
    }
  }
  return true;
}
int par[200005];
long long qs[200005];
int suff[200005];
int bck[200005];
bool dp[200005];
int main() {
  scanf("%d%d", &n, &m);
  for (int i = 1; i <= n; i++) {
    scanf("%d", s + i);
    qs[i] = qs[i - 1] + s[i];
  }
  for (int i = 0; i < m; i++) {
    int u, v;
    scanf("%d%d", &u, &v);
    g[u].push_back(v);
    g[v].push_back(u);
  }
  if (n > 2000) {
    suff[n + 1] = n + 1;
    for (int i = n; i > 0; i--) {
      par[i] = i;
      for (int j : g[i]) {
        if (j < i)
          par[i] = min(par[i], j);
      }
      suff[i] = min(suff[i + 1], par[i]);
    }
    dp[1] = true;
    bck[1] = 1;
    for (int i = 2; i <= n; i++) {
      bck[i] = i;
      bck[i] = bck[suff[i]];
      dp[i] = dp[bck[i]];
      dp[i] |= (qs[n] - qs[i - 1]) >= s[i - 1] ? dp[i - 1] : false;
    }
    for (int i = 1; i <= n; i++) {
      if (dp[i])
        printf("1");
      else
        printf("0");
    }
    printf("\n");
  } else {
    for (int i = 1; i <= n; i++) {
      if (check(i))
        printf("1");
      else
        printf("0");
    }
    printf("\n");
  }
  return 0;
}

Compilation message

island.cpp: In function 'int main()':
island.cpp:41:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |   scanf("%d%d", &n, &m);
      |   ~~~~~^~~~~~~~~~~~~~~~
island.cpp:43:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   43 |     scanf("%d", s + i);
      |     ~~~~~^~~~~~~~~~~~~
island.cpp:48:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   48 |     scanf("%d%d", &u, &v);
      |     ~~~~~^~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4948 KB Output is correct
2 Correct 2 ms 4948 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 250 ms 5136 KB Output is correct
5 Correct 212 ms 5076 KB Output is correct
6 Correct 370 ms 5076 KB Output is correct
7 Correct 253 ms 5076 KB Output is correct
8 Correct 197 ms 5076 KB Output is correct
9 Correct 286 ms 5268 KB Output is correct
10 Correct 97 ms 5100 KB Output is correct
11 Correct 91 ms 5152 KB Output is correct
12 Correct 146 ms 5152 KB Output is correct
13 Correct 172 ms 5152 KB Output is correct
14 Correct 147 ms 5076 KB Output is correct

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Correct 3 ms 4948 KB Output is correct
3 Incorrect 113 ms 16256 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Incorrect 119 ms 16328 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 4948 KB Output is correct
2 Incorrect 131 ms 16300 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 4948 KB Output is correct
2 Correct 2 ms 4948 KB Output is correct
3 Correct 3 ms 4948 KB Output is correct
4 Correct 250 ms 5136 KB Output is correct
5 Correct 212 ms 5076 KB Output is correct
6 Correct 370 ms 5076 KB Output is correct
7 Correct 253 ms 5076 KB Output is correct
8 Correct 197 ms 5076 KB Output is correct
9 Correct 286 ms 5268 KB Output is correct
10 Correct 97 ms 5100 KB Output is correct
11 Correct 91 ms 5152 KB Output is correct
12 Correct 146 ms 5152 KB Output is correct
13 Correct 172 ms 5152 KB Output is correct
14 Correct 147 ms 5076 KB Output is correct
15 Correct 3 ms 4948 KB Output is correct
16 Correct 3 ms 4948 KB Output is correct
17 Incorrect 113 ms 16256 KB Output isn't correct
18 Halted 0 ms 0 KB -