oj.uz

Submission #549514

# Submission time Handle Problem Language Result Execution time Memory
549514 2022-04-16T01:58:32 Z theshadow_04 Skyscraper (JOI16_skyscraper) C++14
5 / 100
 245 ms 101336 KB 
// annotshy

#include <bits/stdc++.h>

#define Task "CF"
#define MOD 1000000007
#define pb push_back

using namespace std;

const int maxn = 200005;

int n, l;
int a[maxn];
int dp[(1 << 14) + 5][15][105];

void Sub1() {
  vector<int> v;
  for(int i = 1; i <= n; ++i) cin >> a[i], v.pb(i);
  int ans = 0;
  do {
    long long res = 0;
    for(int i = 0; i < (int) v.size() - 1; ++ i) res += abs(a[v[i + 1]] - a[v[i]]);
    if(res <= l) ++ ans;
    if(ans > MOD) ans -= MOD;
  } while(next_permutation(v.begin(), v.end()));
  cout << ans << "\n";
}

void Solve(int Test) {
  cin >> n >> l;
  if(n <= 8) {
    Sub1();
    return;
  }
  for(int i = 0; i < n; ++ i) cin >> a[i];
  memset(dp, 0, sizeof dp);
  for(int i = 0; i < n; ++ i) {
    dp[(1 << i)][i][0] = 1;
  }
  for(int mask = 0; mask < (1 << n); ++ mask) {
    for(int last = 0; last < n; ++ last) {
      for(int s = 0; s <= l; ++ s) {
        if(dp[mask][last][s] == 0 || !(mask >> last & 1)) continue;
        for(int nex = 0; nex < n; ++ nex) {
          if(mask >> nex & 1) continue;
          (dp[mask + (1 << nex)][nex][s + abs(a[last] - a[nex])] += dp[mask][last][s]) %= MOD;
        }
      }
    }
  }
  int ans = 0;
  for(int last = 0; last < n; ++ last) {
    for(int s = 0; s <= l; ++ s) {
      (ans += dp[(1 << n) - 1][last][s]) %= MOD;
    }
  }
  cout << ans << "\n";
}

signed main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0), cout.tie(0);
  if(fopen(Task".inp", "r")) {
    freopen(Task".inp", "r", stdin);
    freopen(Task".out", "w", stdout);
  }
  int test = 1;
  // cin >> test;
  for(int i = 1; i <= test; ++ i) {
    Solve(i);
  }
}

/*no pain no gain*/

Compilation message

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:65:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |     freopen(Task".inp", "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
skyscraper.cpp:66:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   66 |     freopen(Task".out", "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct

Subtask #2
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 56 ms 101300 KB Output is correct
2 Incorrect 245 ms 101336 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 212 KB Output is correct
10 Correct 1 ms 212 KB Output is correct
11 Correct 56 ms 101300 KB Output is correct
12 Incorrect 245 ms 101336 KB Output isn't correct
13 Halted 0 ms 0 KB -