oj.uz

Submission #530509

# Submission time Handle Problem Language Result Execution time Memory
530509 2022-02-25T15:41:33 Z tphuc2908 Skyscraper (JOI16_skyscraper) C++14
15 / 100
 1 ms 844 KB 
#include<bits/stdc++.h>

using namespace std;
//#pragma GCC optimize("O3,unroll-loops")
//#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#define rep(i, x, y) for(int i = x; i <= y; ++i)
#define repi(i,x,y) for(int i = x; i >= y; --i)
#define ci(x) int x; cin>> x
#define TC(t) ci(t); while(t--)
#define fi first
#define se second
#define pb push_back
#define all(x) x.begin(), x.end()
#define cii(x, y) ci(x); ci(y)
#define ciii(x, y, z) ci(x); ci(y); ci(z)
#define mp make_pair
//#define int long long
typedef long long ll;
typedef vector<int> vi;
const int N = 100 + 5;
const int NN = 16 + 15;
const int mod =  1e9 + 7;
const int mod1 = 1e9 + 9;
const int pi = 31;
const ll inf = 1e15 + 6;
const int block = 500;
const int dx[4] = {-1, 0, 1, 0};
const int dy[4] = {0, -1, 0, 1};

void readfile(){
    #ifdef ONLINE_JUDGE
    #else
        freopen("text.inp", "r", stdin);
    #endif // ONLINE_JUDGE
//    freopen("text.inp", "r", stdin);
//    freopen("template.out", "w", stdout);
}

int n, L;
int a[N];

void inp(){
    cin >> n >> L;
    for(int i = 1; i <= n; ++i) cin >> a[i];
    sort(a + 1, a + n + 1);
}

int add(int x, int y){
    x += y;
    while(x < 0) x += mod;
    while(x >= mod) x -= mod;
    return x;
}

int mul(int x, int y){
    return (x * 1LL * y) % mod;
}

int dp[N][N][N*N][3];

void process(){
    dp[1][1][0][0] = 1;
    dp[1][1][0][1] = 2;
    dp[1][1][0][2] = 1;
    for(int i = 1; i < n; ++i){
        for(int j = 1; j <= i; ++j){
            for(int k = 0; k <= L; ++k){
                for(int t = 0; t < 3; ++t){
                    int val = k + (2*j - t) * (a[i + 1] - a[i]);
                    if(val > L) continue;
                    // new cc
                    dp[i + 1][j + 1][val][t] = add(dp[i + 1][j + 1][val][t], mul(j + 1 - t, dp[i][j][k][t]));
                    if(t + 1 <= 2)
                        dp[i + 1][j + 1][val][t + 1] = add(dp[i + 1][j + 1][val][t + 1], mul(dp[i][j][k][t], 2 - t));
                    // into existing cc
                    dp[i + 1][j][val][t] = add(dp[i + 1][j][val][t], mul(dp[i][j][k][t], 2*j - t));
                    if(t + 1 <= 2)
                        dp[i + 1][j][val][t + 1] = add(dp[i + 1][j][val][t + 1], mul(dp[i][j][k][t], 2 - t));
                    // merge cc
                    dp[i + 1][j - 1][val][t] = add(dp[i + 1][j - 1][val][t], mul(dp[i][j][k][t], j - 1));
                }
            }
        }
    }
    int res = 0;
    for(int i = 1; i <= L; ++i)
        res = add(res, dp[n][1][i][2]);
    cout << res;
}

int main() {
//    readfile();
    ios_base::sync_with_stdio(0);
    cin.tie(0);
//    int t; cin >> t;
//    while(t--){
        inp();
        process();
//    }
    return 0;
}

Compilation message

skyscraper.cpp: In function 'void readfile()':
skyscraper.cpp:33:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |         freopen("text.inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 284 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 712 KB Output is correct
2 Correct 1 ms 844 KB Output is correct
3 Correct 1 ms 844 KB Output is correct
4 Correct 1 ms 716 KB Output is correct
5 Correct 1 ms 840 KB Output is correct
6 Correct 1 ms 844 KB Output is correct
7 Correct 1 ms 844 KB Output is correct
8 Correct 1 ms 844 KB Output is correct
9 Correct 1 ms 844 KB Output is correct
10 Correct 1 ms 844 KB Output is correct

Subtask #3
0 / 80.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 284 KB Output isn't correct
2 Halted 0 ms 0 KB -