Submission #1105664

#	Time	Username	Problem	Language	Result	Execution time	Memory
1105664		cpptowin	Safety (NOI18_safety)	C++17	0 / 100	2037 ms	86720 KiB

safety

#include <bits/stdc++.h>
#define fo(i, d, c) for (int i = d; i <= c; i++)
#define fod(i, c, d) for (int i = c; i >= d; i--)
#define maxn 1000010
#define N 5010
#define fi first
#define se second
#define pb emplace_back
#define en cout << "\n";
#define bitcount(x) __builtin_popcountll(x)
#define pii pair<int, int>
#define vii vector<pii>
#define lb(x) x & -x
#define bit(i, j) ((i >> j) & 1)
#define offbit(i, j) (i ^ (1LL << j))
#define onbit(i, j) (i | (1LL << j))
#define vi vector<int>
#define all(x) x.begin(), x.end()
#define ss(x) (int)x.size()
#define UNIQUE(v) v.erase(unique(all(v)),v.end())
template <typename T1, typename T2>
bool minimize(T1 &a, T2 b)
{
    if (a > b)
    {
        a = b;
        return true;
    }
    return false;
}
template <typename T1, typename T2>
bool maximize(T1 &a, T2 b)
{
    if (a < b)
    {
        a = b;
        return true;
    }
    return false;
}
using namespace std;
const int nsqrt = 450;
const int mod = 1e9 + 7;
void add(int &x, int k)
{
    x += k;
    x %= mod;
    if(x < 0) x += mod;
}
void del(int &x, int k)
{
    x -= k;
    x %= mod;
    if(x < 0) x += mod;
}
struct SegmentTree
{
    vector<int> st;
    int n;
    /// real n
    SegmentTree(int _n = 0) : n(_n)
    {
        st.resize(4 * n + 10,0);
    }
    void resize(int _n)
    {
        n = _n;
        st.resize(4 * n + 10,0);
    }
    void update(int id, int l, int r, int x, int val)
    {
        if (x > r or x < l)
            return;
        if (l == r)
        {
            st[id] += val;
            return;
        }
        int mid = (l + r) >> 1;
        update(id << 1, l, mid, x, val);
        update(id << 1 | 1, mid + 1, r, x, val);
        st[id] = min(st[id << 1], st[id << 1 | 1]);
    }
    void assign(int id, int l, int r, int x, int val)
    {
        if (x > r or x < l)
            return;
        if (l == r)
        {
            st[id] = val;
            return;
        }
        int mid = (l + r) >> 1;
        assign(id << 1, l, mid, x, val);
        assign(id << 1 | 1, mid + 1, r, x, val);
        st[id] = min(st[id << 1], st[id << 1 | 1]);
    }
    int get(int id, int l, int r, int u, int v)
    {
        if (l > v || u > r)
            return 1e9;
        if (u <= l && r <= v)
            return st[id];
        int mid = (l + r) >> 1;
        return min(get(id << 1, l, mid, u, v), get(id << 1 | 1, mid + 1, r, u, v));
    }
    int walkright(int id, int l, int r, int x, int val)
    {
        if (st[id] >= val)
            return -1;
        if (r < x)
            return -1;
        if (l == r)
            return l;
        int ans = -1;
        int mid = (l + r) >> 1;
        if (st[id << 1] < val)
            ans = walkright(id << 1, l, mid, x, val);
        if (ans == -1)
            ans = walkright(id << 1 | 1, mid + 1, r, x, val);
        return ans;
    }
    int walkleft(int id, int l, int r, int x, int val)
    {
        if (st[id] >= val)
            return -1;
        if (x < l)
            return -1;
        if (l == r)
            return l;
        int ans = -1;
        int mid = (l + r) >> 1;
        if (st[id << 1 | 1] < val)
            ans = walkleft(id << 1 | 1, mid + 1, r, x, val);
        if (ans == -1)
            ans = walkleft(id << 1, l, mid, x, val);
        return ans;
    }
    int get(int l, int r)
    {
        return get(1, 1, n, l, r);
    }
    void update(int x, int val)
    {
        update(1, 1, n, x, val);
    }
    void assign(int x, int val)
    {
        assign(1, 1, n, x, val);
    }
    int walkleft(int x,int val)
    {
        return walkleft(1,1,n,x,val);
    }
    int walkright(int x,int val)
    {
        return walkright(1,1,n,x,val);
    }
};
int n,a[maxn],f[N][N],lim;
main()
{
#define name "TASK"
    if (fopen(name ".inp", "r"))
    {
        freopen(name ".inp", "r", stdin);
        freopen(name ".out", "w", stdout);
    }
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> n >> lim;
    fo(i,1,n) cin >> a[i];
    fo(i,1,n) 
    {
        SegmentTree st(5000);
        fo(j,0,5000) st.assign(j,f[i - 1][j]);
        fo(j,0,5000) f[i][j] = st.get(max(j - lim,0),min(5000,j + lim)) + abs(j - a[i]);
    }
    int ans = 1e9;
    fo(i,0,5000) minimize(ans,f[n][i]);
    cout << ans;
}

Compilation message (stderr)

safety.cpp:161:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
  161 | main()
      | ^~~~
safety.cpp: In function 'int main()':
safety.cpp:166:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  166 |         freopen(name ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
safety.cpp:167:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  167 |         freopen(name ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 3
• Subtask 2: 0 / 4
• Subtask 3: 0 / 9
• Subtask 4: 0 / 5
• Subtask 5: 0 / 6
• Subtask 6: 0 / 11
• Subtask 7: 0 / 11
• Subtask 8: 0 / 22
• Subtask 9: 0 / 29