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Submission #304160

# Submission time Handle Problem Language Result Execution time Memory
304160 2020-09-21T03:48:21 Z 2qbingxuan Packing Biscuits (IOI20_biscuits) C++14
0 / 100
 455 ms 1272 KB 
#include <bits/stdc++.h>
#ifdef local
#define safe std::cerr<<__PRETTY_FUNCTION__<<" line "<<__LINE__<<" safe\n"
#define debug(...) qqbx(#__VA_ARGS__, __VA_ARGS__)
template <typename H, typename ...T> void qqbx(const char*s, const H &h, T ...args) {
    for(; *s && *s != ','; ++s) if(*s != ' ') std::cerr << *s;
    std::cerr << " = " << h << (sizeof...(T) ? ", " : "\n");
    if constexpr (sizeof...(T)) qqbx(++s, args...);
}
#else
#include "biscuits.h"
#define debug(...) ((void)0)
#define safe ((void)0)
#endif // local
#define pb emplace_back

using namespace std;
typedef long long ll;
const int N = 2500025;

bool check(ll y, ll x, vector<ll> a) {
    int k = a.size();
    ll now = 0;
    for(int i = 0; i < k; i++) {
        now += a[i] << i;
        ll m = y & ((1LL<<i+1)-1);
        if(now < x * m) return false;
    }
    return true;
}
ll count_tastiness(ll x, vector<ll> a) {
    int k = a.size();
    /* cerr << x << '\n'; */
    /* for(int i = 0; i < k; i++) cerr << a[i] << (i+1==k ? '\n' : ' '); */
    vector<ll> sum(k);
    sum[0] = a[0];
    for(int i = 1; i < k; i++) sum[i] = sum[i-1] + (a[i] << i);
    for(int i = 0; i < k; i++) sum[i] /= x;
    vector<map<ll,ll>> mp(k);
    // count how many y, \forall i, (y & (11...11)) <= lim
    function<ll(int,ll)> calc = [&](int i, ll lim) -> ll {
        /* if(lim < 0) return 0; */
        if(lim > sum[i]) lim = sum[i];
        if(i == 0) return lim + 1;
        if(mp[i].count(lim)) return mp[i][lim];
        if(lim >= (1LL>>i))
            return mp[i][lim] = calc(i-1, lim-(1LL<<i)) + calc(i-1, lim);
        return mp[i][lim] = calc(i-1, lim);
    };
    ll ans = calc(k-1, 1e18);
    debug(ans);
    return ans;
}

#ifdef local
signed main() {
    count_tastiness(3, {5, 2, 1});
    count_tastiness(2, {2, 1, 2});
}
#endif // local

Compilation message

biscuits.cpp: In function 'bool check(ll, ll, std::vector<long long int>)':
biscuits.cpp:26:28: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
   26 |         ll m = y & ((1LL<<i+1)-1);
      |                           ~^~

Subtask #1
0 / 9.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 35.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Incorrect 455 ms 1272 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 384 KB Output isn't correct
2 Halted 0 ms 0 KB -