Submission #1113294

#	Time	Username	Problem	Language	Result	Execution time	Memory
1113294		cpptowin	Uplifting Excursion (BOI22_vault)	C++17	100 / 100	1225 ms	3656 KiB

vault

#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 fi first
#define se second
#define pb emplace_back
#define en cout << "\n";
#define int long long
#define inf (int)4e18
#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;
}
int m,lim;
int a[maxn],c[maxn];
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 >> m >> lim;
    fo(i,0,2 * m) cin >> a[i];
    int sum = 0;
    fo(i,0,m)
    {
        sum += (i - m) * a[i];
        c[i] = a[i];
    }
    fo(i,m + 1,2 * m)
    {
        c[i] = min(a[i],(lim - sum) / (i - m));
        sum += c[i] * (i - m);
    }
    fo(i,0,m - 1)
    {
        int val = min(a[i],(lim - sum) / (m - i));
        c[i] -= val;
        sum += val * (m - i);
    }
    if(abs(sum - lim) > m) return cout << "impossible",0;
    vii things;
    int tot = 0;
    fo(i,0,2 * m)
    {
        tot += c[i];
        if(i == m) continue;
        int k = 1,s = min(m * m,a[i] - c[i]);
        while(k <= s)
        {
            things.pb(k * (i - m),k);
            s -= k;
            k *= 2;
        }
        if(s > 0) things.pb(s * (i - m),s);
        k = 1,s = min(c[i],m * m);
        while(k <= s)
        {
            things.pb(k * (m - i),-k);
            s -= k;
            k *= 2;
        }
        if(s > 0) things.pb(s * (m - i),-s);
    }
    int n = ss(things);
    int N = m * m;
    vi f(2 * N + 10,-inf),dp(2 * N + 10,-inf);
    dp[N] = f[N] = 0;
    for(auto [val,fre] : things)
    {
        fo(i,0,2 * N) if(i - val <= 2 * N and i - val >= 0 and dp[i - val] != -inf) maximize(f[i],dp[i - val] + fre);
        dp = f;
    }
    if(f[lim - sum + N] + tot >= 0) cout << f[lim - sum + N] + tot;
    else cout << "impossible";
}

Compilation message (stderr)

vault.cpp:59:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   59 | main()
      | ^~~~
vault.cpp: In function 'int main()':
vault.cpp:112:9: warning: unused variable 'n' [-Wunused-variable]
  112 |     int n = ss(things);
      |         ^
vault.cpp:64:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   64 |         freopen(name ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
vault.cpp:65:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |         freopen(name ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 15 / 15
• Subtask 3-1: 10 / 10
• Subtask 3-2: 10 / 10
• Subtask 4-1: 10 / 10
• Subtask 4-2: 10 / 10
• Subtask 5-1: 10 / 10
• Subtask 5-2: 10 / 10
• Subtask 6-1: 10 / 10
• Subtask 6-2: 10 / 10