oj.uz

Submission #614239

# Submission time Handle Problem Language Result Execution time Memory
614239 2022-07-30T23:05:05 Z Plurm Stranded Far From Home (BOI22_island) C++11
10 / 100
 383 ms 15564 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];
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;
    for (int i = 2; i <= n; i++) {
      dp[i] = (qs[n] - qs[i - 1]) >= s[i - 1] ? dp[i - 1] : false;
    }
    for (int i = 1; i <= n; i++) {
      if (dp[suff[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:40:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |   scanf("%d%d", &n, &m);
      |   ~~~~~^~~~~~~~~~~~~~~~
island.cpp:42:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |     scanf("%d", s + i);
      |     ~~~~~^~~~~~~~~~~~~
island.cpp:47:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   47 |     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 3 ms 4948 KB Output is correct
3 Correct 2 ms 4948 KB Output is correct
4 Correct 254 ms 5144 KB Output is correct
5 Correct 214 ms 5076 KB Output is correct
6 Correct 383 ms 5144 KB Output is correct
7 Correct 261 ms 5140 KB Output is correct
8 Correct 209 ms 5136 KB Output is correct
9 Correct 287 ms 5156 KB Output is correct
10 Correct 103 ms 5152 KB Output is correct
11 Correct 98 ms 5076 KB Output is correct
12 Correct 152 ms 5160 KB Output is correct
13 Correct 169 ms 5156 KB Output is correct
14 Correct 146 ms 5156 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 120 ms 15564 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 134 ms 15508 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 136 ms 15560 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 3 ms 4948 KB Output is correct
3 Correct 2 ms 4948 KB Output is correct
4 Correct 254 ms 5144 KB Output is correct
5 Correct 214 ms 5076 KB Output is correct
6 Correct 383 ms 5144 KB Output is correct
7 Correct 261 ms 5140 KB Output is correct
8 Correct 209 ms 5136 KB Output is correct
9 Correct 287 ms 5156 KB Output is correct
10 Correct 103 ms 5152 KB Output is correct
11 Correct 98 ms 5076 KB Output is correct
12 Correct 152 ms 5160 KB Output is correct
13 Correct 169 ms 5156 KB Output is correct
14 Correct 146 ms 5156 KB Output is correct
15 Correct 3 ms 4948 KB Output is correct
16 Correct 3 ms 4948 KB Output is correct
17 Incorrect 120 ms 15564 KB Output isn't correct
18 Halted 0 ms 0 KB -