Submission #866845

#TimeUsernameProblemLanguageResultExecution timeMemory
866845prohackerSkyscraper (JOI16_skyscraper)C++14
100 / 100
68 ms50884 KiB
#include <bits/stdc++.h> typedef long long ll; using namespace std; const ll MOD = 1e9 + 7; int a[102]; ll dp[102][102][1002][3]; int main() { if (fopen("task.inp", "r")) { freopen("task.inp", "r", stdin); freopen("task.ans", "w", stdout); } ios_base::sync_with_stdio(0); cin.tie(0); int n, l; cin >> n >> l; if (n == 1) return cout << 1, 0; for (int i = 1; i <= n; i++) cin >> a[i]; sort(a + 1, a + n + 1); a[n + 1] = 10000; dp[0][0][0][0] = 1; for (int i = 1; i <= n; i++) { for (int j = 1; j <= i; j++) { for (int k = 0; k <= l; k++) { for (int m = 0; m <= 2; m++) { int cost_diff = (2 * j - m) * (a[i + 1] - a[i]); if (cost_diff > k || i + j + 1 - m > n) continue; // Case 1 dp[i][j][k][m] += dp[i - 1][j - 1][k - cost_diff][m]; // Case 2 if (m) dp[i][j][k][m] += (3 - m) * dp[i - 1][j - 1][k - cost_diff][m - 1]; // Case 3 dp[i][j][k][m] += (2 * j - m) * dp[i - 1][j][k - cost_diff][m]; // Case 4 if (m == 1) dp[i][j][k][m] += 2 * j * dp[i - 1][j][k - cost_diff][m - 1]; if (m == 2) { if (i == n) dp[i][j][k][m] += dp[i - 1][j][k - cost_diff][m - 1]; else if (j > 1) dp[i][j][k][m] += (j - 1) * dp[i - 1][j][k - cost_diff][m - 1]; } // Case 5 if (m == 2) { if (i == n) dp[i][j][k][m] += dp[i - 1][j + 1][k - cost_diff][m]; else dp[i][j][k][m] += j * (j - 1) * dp[i - 1][j + 1][k - cost_diff][m]; } else if (m == 1) dp[i][j][k][m] += j * j * dp[i - 1][j + 1][k - cost_diff][m]; else dp[i][j][k][m] += j * (j + 1) * dp[i - 1][j + 1][k - cost_diff][m]; dp[i][j][k][m] %= MOD; } } } } ll ans = 0; for (int i = 0; i <= l; i++) ans += dp[n][1][i][2]; cout << ans % MOD; return 0; }

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:12:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   12 |         freopen("task.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
skyscraper.cpp:13:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |         freopen("task.ans", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
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