Submission #750721

#	Time	Username	Problem	Language	Result	Execution time	Memory
750721		Sami_Massah	Collecting Stamps 3 (JOI20_ho_t3)	C++17	0 / 100	12 ms	22300 KiB

ho_t3

#include <bits/stdc++.h>
using namespace std;



const int maxn = 100 + 12, inf = 1e9 + 12;
long long n, L, dist[maxn], t[maxn], dp[maxn][maxn][maxn][2];
bool done = 0;
int get_dist(int a, int b){
    if(a == n - 1 && b == 0)
        return L - dist[a];
    return abs(dist[a] - dist[b]);

}
long long find_ans(int a, int b, int c, int d){
    if(c < 0)
        return inf;
    if(dp[a][b][c][d] != -1)
        return dp[a][b][c][d];
    dp[a][b][c][d] = inf;
    //cout << a << ' ' << b << ' ' << c << ' ' << d << endl;
    if(d == 0){
        if(a != 0){
            dp[a][b][c][d] = min(dp[a][b][c][d], find_ans((a + 1) % n, b, c, d) + get_dist(a, a + 1));
            long long x = find_ans((a + 1) % n, b, c - 1, d) + get_dist(a, a + 1);
            if(x <= t[a])
                dp[a][b][c][d] = min(dp[a][b][c][d], x);
        }
        if(a != 0){
            dp[a][b][c][d] = min(dp[a][b][c][d], find_ans((a + 1) % n, b, c, d ^ 1) + L - dist[a] + dist[b]);
            long long x = find_ans((a + 1) % n, b, c - 1, d ^ 1) + L - dist[a] + dist[b];
            if(x <= t[a])
                dp[a][b][c][d] = min(dp[a][b][c][d], x);
        }
    }
    if(d == 1){
        if(b != 0){
            dp[a][b][c][d] = min(dp[a][b][c][d], find_ans(a, b - 1, c, d) + get_dist(b, b - 1));
            long long x = find_ans(a, b - 1, c - 1, d) + get_dist(b, b - 1);
            if(x <= t[b])
                dp[a][b][c][d] = min(dp[a][b][c][d], x);
        }
        if(b != 0){
            dp[a][b][c][d] = min(dp[a][b][c][d], find_ans(a, b - 1, c, d ^ 1) + L - dist[a] + dist[b]);
            long long x = find_ans(a, b - 1, c - 1, d ^ 1) + L - dist[a] + dist[b];
            if(x <= t[b])
                dp[a][b][c][d] = min(dp[a][b][c][d], x);
        }

    }

    return dp[a][b][c][d];



}

int main(){
    memset(dp, -1, sizeof dp);
    cin >> n >> L;
    for(int i = 1; i <= n; i++)
        cin >> dist[i];
    for(int i = 1; i <= n; i++)
        cin >> t[i];
    t[0] = 0;
    dist[0] = 0;
    n += 1;
    dp[0][0][0][0] = 0;
    dp[0][0][1][0] = 0;
    dp[0][0][0][1] = 0;
    dp[0][0][1][1] = 0;
    int ans = 0;

    for(int i = 0; i <= n; i++)
        for(int j = 0; j < i; j++)
            for(int c = 0; c <= n; c++)
                for(int d = 0; d < 2; d++){
                    find_ans(i, j, c, d);
                    if(dp[i][j][c][d] != inf)
                        ans = max(ans, c);
            }
    for(int j = 0; j <= n; j++)
        for(int c = 0; c <= n; c++)
            for(int d = 0; d < 2; d++){
                find_ans(0, j, c, d);
                if(dp[0][j][c][d] != inf)
                    ans = max(ans, c);
            }
    cout << ans - 1 << endl;

}

Compilation message (stderr)

ho_t3.cpp: In function 'long long int _Z8find_ansiiii.part.0(int, int, int, int)':
ho_t3.cpp:11:26: warning: array subscript -1 is below array bounds of 'long long int [112]' [-Warray-bounds]
   11 |         return L - dist[a];
      |                    ~~~~~~^
ho_t3.cpp:7:17: note: while referencing 'dist'
    7 | long long n, L, dist[maxn], t[maxn], dp[maxn][maxn][maxn][2];
      |                 ^~~~
ho_t3.cpp:11:26: warning: array subscript -1 is below array bounds of 'long long int [112]' [-Warray-bounds]
   11 |         return L - dist[a];
      |                    ~~~~~~^
ho_t3.cpp:7:17: note: while referencing 'dist'
    7 | long long n, L, dist[maxn], t[maxn], dp[maxn][maxn][maxn][2];
      |                 ^~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 75