Submission #638005

#	Time	Username	Problem	Language	Result	Execution time	Memory
638005		Do_you_copy	Skyscraper (JOI16_skyscraper)	C++17	100 / 100	70 ms	51092 KiB

skyscraper

#include <bits/stdc++.h>
#define int long long
#define fi first
#define se second
#define pb push_back
#define faster ios_base::sync_with_stdio(0); cin.tie(0);
using namespace std;
using ll = long long;
using ull = unsigned ll;
using ld = long double;
using pii = pair <int, int>;
using pil = pair <int, ll>;
using pli = pair <ll, int>;
using pll = pair <ll, ll>;
mt19937 Rand(chrono::steady_clock::now().time_since_epoch().count());

ll min(const ll &a, const ll &b){
    return (a < b) ? a : b;
}

ll max(const ll &a, const ll &b){
    return (a > b) ? a : b;
}

const ll Mod = 1000000007;
//const ll Mod2 = 999999999989;
//only use when required
const int maxN = 1e2 + 10;
const int maxL = 1e3 + 10;
int n, L;
int a[maxN];
ll dp[maxN][maxN][maxL][3];

void Init(){
    cin >> n >> L;
    a[n] = 1e7;
    if (n == 1){
        cout << 1; return;
    }
    for (int i = 0; i < n; ++i) cin >> a[i];
    sort(a, a + n);
    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){
                    ll delta = (2 * j - m) * (a[i] - a[i - 1]);
                    if (delta > k|| i + j + 1 - m > n) continue;
                    dp[i][j][k][m] += dp[i - 1][j - 1][k - delta][m];
                    if (m > 0){
                        dp[i][j][k][m] += (3 - m) * dp[i - 1][j - 1][k - delta][m - 1];
                        if (m == 1) dp[i][j][k][m] += 2 * j * dp[i - 1][j][k - delta][m - 1];
                        else if (m == 2 && i == n) dp[i][j][k][m] += dp[i - 1][j][k - delta][m - 1];
                        else dp[i][j][k][m] += (j - 1) * dp[i - 1][j][k - delta][m - 1];
                    }
                    dp[i][j][k][m] += (2 * j - m) * dp[i - 1][j][k - delta][m];
                    if (m == 2 && i == n) dp[i][j][k][m] += dp[i - 1][j + 1][k - delta][m];
                    else if (m == 2) dp[i][j][k][m] += j * (j - 1) * dp[i - 1][j + 1][k - delta][m];
                    else if (m == 1) dp[i][j][k][m] += j * j * dp[i - 1][j + 1][k - delta][m];
                    else dp[i][j][k][m] += j * (j + 1) * dp[i - 1][j + 1][k - delta][m];
                    dp[i][j][k][m] %= Mod;
                }
            }
        }
    }
    ll ans = 0;
    for (int i = 0; i <= L; ++i){
        ans += dp[n][1][i][2];
        ans %= Mod;
    }
    cout << ans;
}

#define debug
#define taskname "test"
signed main(){
    if (fopen(taskname".inp", "r")){
        freopen(taskname".inp", "r", stdin);
        #ifdef debug
        freopen(taskname".out", "w", stdout);
        #endif
    }
    faster;
    ll tt = 1;
    //cin >> tt;
    while (tt--){
        Init();
    }
    if (fopen("timeout.txt", "r")){
        ofstream timeout("timeout.txt");
        timeout << 1000 * double(clock()) / CLOCKS_PER_SEC;
        #ifndef debug
        cerr << "\nTime elapsed: " << 1000 * double(clock()) / CLOCKS_PER_SEC << "ms\n";
        #endif
    }
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:78:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   78 |         freopen(taskname".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
skyscraper.cpp:80:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   80 |         freopen(taskname".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 15 / 15
• Subtask 3: 80 / 80