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답안 #369568

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
369568 2021-02-21T22:03:38 Z solaimanope Skyscraper (JOI16_skyscraper) C++17
100 / 100
 339 ms 167068 KB 
#include<bits/stdc++.h>
using namespace std;
const int MOD = 1e9+7;

int sum(int a, int b) {
    return a + b >= MOD ? a + b - MOD : a + b;
}
void sumi(int &a, int b) {
    a = sum(a, b);
}
int sub(int a, int b) {
    return a - b < 0 ? a - b + MOD : a - b;
}
int mul(int a, int b) {
    return (1LL*a*b)%MOD;
}

const int MAXN = 103, MAXL = 1003;
int ar[MAXN];

int dp[MAXN][MAXN][2][2][MAXL];
int n, l;

int solve(int ps, int open, int bam, int dan, int x) {
    if (x > l) return 0;
//    if (x < 0) {
//        cout << "[" << ps << "][" << open << "][" << bam << "][" << dan << "][" << x << "]" << endl;
//    }
    assert(x >= 0);
    if (ps == n) {
        if (open == 1) return bam ^ dan;
        if (open == 2) return bam & dan;
        return 0;
    }

    int &ans = dp[ps][open][bam][dan][x];
    if (ans != -1) return ans;
    ans = 0;

    int y = open*2-bam-dan;
    int z = ar[ps+1]-ar[ps];

//    vector< string >vs;
//    int b4 = 0;

    ///single comp inside
    sumi(ans, solve(ps+1, open+1, bam, dan, x+y*z+2*z));
//    if (ans != b4) {
//        vs.push_back("single comp inside");
//        b4 = ans;
//    }

    ///single comp border
    if (!bam) sumi(ans, solve(ps+1, open+1, 1, dan, x+y*z+z));
//    if (ans != b4) {
//        vs.push_back("single comp border bam");
//        b4 = ans;
//    }
    if (!dan) sumi(ans, solve(ps+1, open+1, bam, 1, x+y*z+z));
//    if (ans != b4) {
//        vs.push_back("single comp border dan");
//        b4 = ans;
//    }

    ///extend one side of a comp inside
    if (open > 0) sumi(ans, mul(open*2-bam-dan, solve(ps+1, open, bam, dan, x+y*z)));
//    if (ans != b4) {
//        vs.push_back("extend one side of a comp inside");
//        b4 = ans;
//    }

    ///extend one side of a comp border
    if (!bam && open > dan) sumi(ans, mul(open-dan, solve(ps+1, open, 1, dan, x+y*z-z)));
//    if (ans != b4) {
//        vs.push_back("extend one side of a comp border bam");
//        b4 = ans;
//    }
    if (!dan && open > bam) sumi(ans, mul(open-bam, solve(ps+1, open, bam, 1, x+y*z-z)));
//    if (ans != b4) {
//        vs.push_back("extend one side of a comp border dan");
//        b4 = ans;
//    }

    ///glue two comps
    if (open >= 2) {
        int ways = (open-dan)*(open-bam)-bam*dan-(open-bam-dan);
        if (ways > 0) sumi(ans, mul(ways, solve(ps+1, open-1, bam, dan, x+y*z-2*z)));
    }
//    if (ans != b4) {
//        vs.push_back("glue two comps");
//        b4 = ans;
//    }

//    for (string s : vs) cout << s << " | ";
//    cout << endl;
//    cout << "dp[" << ps << "][" << open << "][" << bam << "][" << dan << "][" << x << "] = " << ans << endl;
    return ans;
}

int main() {
    cin >> n >> l;

    for (int i = 1; i <= n; i++) cin >> ar[i];
    sort(ar+1, ar+n+1);

    ///handle n == 1
    if (n == 1) {
        cout << 1 << endl;
        return 0;
    }

    memset(dp, -1, sizeof dp);
    cout << solve(1, 0, 0, 0, 0) << endl;

    return 0;
}

Subtask #1
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 81 ms 166912 KB Output is correct
3 Correct 81 ms 166892 KB Output is correct
4 Correct 82 ms 167020 KB Output is correct
5 Correct 83 ms 166892 KB Output is correct
6 Correct 82 ms 166892 KB Output is correct
7 Correct 82 ms 167020 KB Output is correct
8 Correct 83 ms 166892 KB Output is correct
9 Correct 86 ms 166892 KB Output is correct
10 Correct 85 ms 167020 KB Output is correct

Subtask #2
15.0 / 15.0

# 결과 실행 시간 메모리 Grader output
1 Correct 84 ms 166892 KB Output is correct
2 Correct 85 ms 166892 KB Output is correct
3 Correct 83 ms 166892 KB Output is correct
4 Correct 83 ms 166892 KB Output is correct
5 Correct 86 ms 167020 KB Output is correct
6 Correct 84 ms 166944 KB Output is correct
7 Correct 82 ms 166892 KB Output is correct
8 Correct 83 ms 166892 KB Output is correct
9 Correct 83 ms 167020 KB Output is correct
10 Correct 82 ms 167020 KB Output is correct

Subtask #3
80.0 / 80.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 364 KB Output is correct
2 Correct 81 ms 166912 KB Output is correct
3 Correct 81 ms 166892 KB Output is correct
4 Correct 82 ms 167020 KB Output is correct
5 Correct 83 ms 166892 KB Output is correct
6 Correct 82 ms 166892 KB Output is correct
7 Correct 82 ms 167020 KB Output is correct
8 Correct 83 ms 166892 KB Output is correct
9 Correct 86 ms 166892 KB Output is correct
10 Correct 85 ms 167020 KB Output is correct
11 Correct 84 ms 166892 KB Output is correct
12 Correct 85 ms 166892 KB Output is correct
13 Correct 83 ms 166892 KB Output is correct
14 Correct 83 ms 166892 KB Output is correct
15 Correct 86 ms 167020 KB Output is correct
16 Correct 84 ms 166944 KB Output is correct
17 Correct 82 ms 166892 KB Output is correct
18 Correct 83 ms 166892 KB Output is correct
19 Correct 83 ms 167020 KB Output is correct
20 Correct 82 ms 167020 KB Output is correct
21 Correct 83 ms 166892 KB Output is correct
22 Correct 339 ms 166892 KB Output is correct
23 Correct 118 ms 166892 KB Output is correct
24 Correct 151 ms 166892 KB Output is correct
25 Correct 131 ms 167068 KB Output is correct
26 Correct 123 ms 167040 KB Output is correct
27 Correct 130 ms 166892 KB Output is correct
28 Correct 157 ms 166892 KB Output is correct
29 Correct 223 ms 167020 KB Output is correct
30 Correct 129 ms 167020 KB Output is correct