oj.uz

Submission #419887

# Submission time Handle Problem Language Result Execution time Memory
419887 2021-06-07T15:47:19 Z cpp219 Skyscraper (JOI16_skyscraper) C++14
100 / 100
 56 ms 23872 KB 
#pragma GCC optimization "O2"
#pragma GCC optimization "unroll-loop"
#pragma GCC target ("avx2")

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define fs first
#define sc second
using namespace std;
const ll N = 1e3 + 9;
const ll mod = 1e9 + 7;
typedef pair<ll,ll> LL;

ll n,l,dp[101][101][1001][3],a[N];

void Add(ll &a,ll b){
    a = (a + b)%mod;
}

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0), cout.tie(0);
    #define task "tst"
    if (fopen(task".inp", "r")){
        freopen(task".inp", "r", stdin);
        //freopen(task".out", "w", stdout);
    }
    cin>>n>>l;
    for (ll i = 0;i < n;i++) cin>>a[i];
    sort(a,a + n); a[n] = 1000000;
    if (n == 1) return cout<<1,0;
    if (a[1] - a[0] <= l) dp[1][1][a[1] - a[0]][1] = 2;
    if (2*(a[1] - a[0]) <= l) dp[1][1][2*(a[1] - a[0])][0] = 1;
    //cout<<dp[1][1][2*(a[1] - a[0])][0]; return 0;
    for (ll i = 1;i < n;i++){
        ll diff = a[i + 1] - a[i];
        for (ll j = 1;j <= i;j++){
            for (ll k = 0;k <= l;k++){
                for (ll z = 0;z < 3;z++){
                    ll now = dp[i][j][k][z];
                    if (!now) continue;
                    //cout<<i<<" "<<j<<" "<<k<<" "<<z<<" ";
                    if (z < 2&&k + diff*(2*j - z - 1) <= l){
                        ll cur = k + diff*(2*j - z - 1);
                        if (i == n - 1) Add(dp[i + 1][j][cur][z + 1],now*(2 - z)*j);
                        else if (z == 0||j > 1) Add(dp[i + 1][j][cur][z + 1],now*(2 - z)*(j - z));
                        if (cur + 2*diff <= l) Add(dp[i + 1][j + 1][cur + 2*diff][z + 1],now*(2 - z));
                    }
                    if (k + diff*(2*j - z + 2) <= l)
                        Add(dp[i + 1][j + 1][k + diff*(2*j - z + 2)][z],now);
                    if (k + diff*(2*j - z) <= l)
                        Add(dp[i + 1][j][k + diff*(2*j - z)][z],now*(2*j - z));

                    if ((k + diff*(2*j - z - 2) <= l) && (j >= 2) && (i == n - 1 || j > 2 || z < 2)){
                        ll cur = k + diff*(2*j - z - 2);
                        if (!z) Add(dp[i + 1][j - 1][cur][z],now*j*(j - 1));
                        if (z == 1) Add(dp[i + 1][j - 1][cur][z],now*(j - 1)*(j - 1));
                        if (z == 2){
                            if (i == n - 1) Add(dp[i + 1][j - 1][cur][z],now);
                            else Add(dp[i + 1][j - 1][cur][z],now*(j - 2)*(j - 1));
                        }
                    }
                }
            }
        }
    }
    //return 0;
    ll ans = 0;
    for (ll i = 0;i <= l;i++) Add(ans,dp[n][1][i][2]);
    cout<<ans;
}

Compilation message

skyscraper.cpp:1: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    1 | #pragma GCC optimization "O2"
      | 
skyscraper.cpp:2: warning: ignoring '#pragma GCC optimization' [-Wunknown-pragmas]
    2 | #pragma GCC optimization "unroll-loop"
      | 
skyscraper.cpp: In function 'int main()':
skyscraper.cpp:26:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 460 KB Output is correct
6 Correct 1 ms 460 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 460 KB Output is correct
9 Correct 1 ms 588 KB Output is correct
10 Correct 1 ms 460 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 588 KB Output is correct
2 Correct 1 ms 460 KB Output is correct
3 Correct 1 ms 588 KB Output is correct
4 Correct 1 ms 460 KB Output is correct
5 Correct 1 ms 460 KB Output is correct
6 Correct 1 ms 588 KB Output is correct
7 Correct 1 ms 460 KB Output is correct
8 Correct 1 ms 588 KB Output is correct
9 Correct 1 ms 588 KB Output is correct
10 Correct 1 ms 460 KB Output is correct

Subtask #3
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 460 KB Output is correct
6 Correct 1 ms 460 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 460 KB Output is correct
9 Correct 1 ms 588 KB Output is correct
10 Correct 1 ms 460 KB Output is correct
11 Correct 1 ms 588 KB Output is correct
12 Correct 1 ms 460 KB Output is correct
13 Correct 1 ms 588 KB Output is correct
14 Correct 1 ms 460 KB Output is correct
15 Correct 1 ms 460 KB Output is correct
16 Correct 1 ms 588 KB Output is correct
17 Correct 1 ms 460 KB Output is correct
18 Correct 1 ms 588 KB Output is correct
19 Correct 1 ms 588 KB Output is correct
20 Correct 1 ms 460 KB Output is correct
21 Correct 2 ms 1100 KB Output is correct
22 Correct 56 ms 23872 KB Output is correct
23 Correct 51 ms 7900 KB Output is correct
24 Correct 50 ms 12120 KB Output is correct
25 Correct 52 ms 9180 KB Output is correct
26 Correct 46 ms 8408 KB Output is correct
27 Correct 23 ms 9692 KB Output is correct
28 Correct 30 ms 11980 KB Output is correct
29 Correct 48 ms 16356 KB Output is correct
30 Correct 53 ms 9256 KB Output is correct