oj.uz

Submission #614243

# Submission time Handle Problem Language Result Execution time Memory
614243 2022-07-30T23:12:12 Z Plurm Stranded Far From Home (BOI22_island) C++11
10 / 100
 372 ms 16288 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++) {
      dp[i] = (qs[n] - qs[i - 1]) >= s[i - 1] ? dp[i - 1] : false;
      bck[i] = i;
      bck[i] = bck[suff[i]];
    }
    for (int i = 1; i <= n; i++) {
      if (dp[bck[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 3 ms 4948 KB Output is correct
3 Correct 2 ms 4948 KB Output is correct
4 Correct 255 ms 5140 KB Output is correct
5 Correct 209 ms 5156 KB Output is correct
6 Correct 372 ms 5076 KB Output is correct
7 Correct 253 ms 5144 KB Output is correct
8 Correct 195 ms 5076 KB Output is correct
9 Correct 270 ms 5156 KB Output is correct
10 Correct 98 ms 5076 KB Output is correct
11 Correct 92 ms 5152 KB Output is correct
12 Correct 146 ms 5152 KB Output is correct
13 Correct 171 ms 5148 KB Output is correct
14 Correct 144 ms 5152 KB Output is correct

Subtask #2
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 Incorrect 113 ms 16288 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 114 ms 16160 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 140 ms 16272 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 255 ms 5140 KB Output is correct
5 Correct 209 ms 5156 KB Output is correct
6 Correct 372 ms 5076 KB Output is correct
7 Correct 253 ms 5144 KB Output is correct
8 Correct 195 ms 5076 KB Output is correct
9 Correct 270 ms 5156 KB Output is correct
10 Correct 98 ms 5076 KB Output is correct
11 Correct 92 ms 5152 KB Output is correct
12 Correct 146 ms 5152 KB Output is correct
13 Correct 171 ms 5148 KB Output is correct
14 Correct 144 ms 5152 KB Output is correct
15 Correct 2 ms 4948 KB Output is correct
16 Correct 2 ms 4948 KB Output is correct
17 Incorrect 113 ms 16288 KB Output isn't correct
18 Halted 0 ms 0 KB -