Submission #62789

#	Time	Username	Problem	Language	Result	Execution time	Memory
62789		qkxwsm	Candies (JOI18_candies)	C++17	100 / 100	1500 ms	162848 KiB

candies

/*
PROG: source
LANG: C++11
_____
.'     '.
/  0   0  \
|     ^     |
|  \     /  |
\  '---'  /
'._____.'
*/
#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>

using namespace std;
using namespace __gnu_pbds;

struct chash
{
        int operator()(int x) const
        {
                x ^= (x >> 20) ^ (x >> 12);
                return x ^ (x >> 7) ^ (x >> 4);
        }
        int operator()(long long x) const
        {
                return x ^ (x >> 32);
        }
};

template<typename T> using orderedset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<typename T, typename U> using hashtable = gp_hash_table<T, U, chash>;

template<class T>
void readi(T &x)
{
        T input = 0;
        bool negative = false;
        char c = ' ';
        while (c < '-')
        {
                c = getchar();
        }
        if (c == '-')
        {
                negative = true;
                c = getchar();
        }
        while (c >= '0')
        {
                input = input * 10 + (c - '0');
                c = getchar();
        }
        if (negative)
        {
                input = -input;
        }
        x = input;
}
template<class T>
void printi(T output)
{
        if (output == 0)
        {
                putchar('0');
                return;
        }
        if (output < 0)
        {
                putchar('-');
                output = -output;
        }
        int aout[20];
        int ilen = 0;
        while(output)
        {
                aout[ilen] = ((output % 10));
                output /= 10;
                ilen++;
        }
        for (int i = ilen - 1; i >= 0; i--)
        {
                putchar(aout[i] + '0');
        }
        return;
}
template<class T>
void ckmin(T &a, T b)
{
        a = min(a, b);
}
template<class T>
void ckmax(T &a, T b)
{
        a = max(a, b);
}
template<class T>
T normalize(T x, T mod = 1000000007)
{
        return (((x % mod) + mod) % mod);
}
long long randomizell(long long mod)
{
        return ((1ll << 45) * rand() + (1ll << 30) * rand() + (1ll << 15) * rand() + rand()) % mod;
}
int randomize(int mod)
{
        return ((1ll << 15) * rand() + rand()) % mod;
}

#define y0 ___y0
#define y1 ___y1
#define MP make_pair
#define MT make_tuple
#define PB push_back
#define PF push_front
#define LB lower_bound
#define UB upper_bound
#define fi first
#define se second
#define debug(x) cerr << #x << " = " << x << endl;

const long double PI = 4.0 * atan(1.0);
const long double EPS = 1e-10;

#define MAGIC 347
#define SINF 10007
#define CO 1000007
#define INF 1000000007
#define BIG 1000000931
#define LARGE 1696969696967ll
#define GIANT 2564008813937411ll
#define LLINF 2696969696969696969ll
#define MAXN 200013

typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<ld, ld> pdd;

int N;
ll arr[MAXN];
vector<ll> seg[3 * MAXN][2][2];

void beat(vector<ll> &a, vector<ll> b)
{
        for (int i = 0; i < b.size(); i++)
        {
                ckmax(a[i], b[i]);
        }
        return;
}
vector<ll> comb(vector<ll> lt, vector<ll> rt)
{
        vector<ll> res(lt.size() + rt.size() - 1), bumps;
        // for (int i = 0; i < lt.size(); i++)
        // {
        //     for (int j = 0; j < rt.size(); j++)
        //     {
        //         ckmax(res[i + j], lt[i] + rt[j]);
        //     }
        // }
        // return res;
        bumps.reserve(lt.size() + rt.size() - 2);
        int it = 1, jt = 1;
        while(it != lt.size() || jt != rt.size())
        {
                if (jt == rt.size() || (it != lt.size() && jt != rt.size() && lt[it] - lt[it - 1] >= rt[jt] - rt[jt - 1]))
                {
                        bumps.PB(lt[it] - lt[it - 1]);
                        it++;
                }
                else
                {
                        bumps.PB(rt[jt] - rt[jt - 1]);
                        jt++;
                }
        }
        res[0] = lt[0] + rt[0];
        for (int i = 1; i < res.size(); i++)
        {
                res[i] = res[i - 1] + bumps[i - 1];
        }
        return res;
}
void solve(int w, int L, int R)
{
        seg[w][0][0].resize((R - L + 2)/ 2);
        seg[w][0][1].resize((R - L + 3)/ 2);
        seg[w][1][0].resize((R - L + 3)/ 2);
        seg[w][1][1].resize((R - L + 4)/ 2);
        if (L == R)
        {
                seg[w][1][1][1] = arr[L];
                return;
        }
        int mid = (L + R) >> 1;
        solve(2 * w, L, mid);
        solve(2 * w + 1, mid + 1, R);
        for (int i = 0; i < 2; i++)
        {
                for (int j = 0; j < 2; j++)
                {
                        beat(seg[w][i][j], comb(seg[2 * w][i][0], seg[2 * w + 1][0][j]));
                        beat(seg[w][i][j], comb(seg[2 * w][i][0], seg[2 * w + 1][1][j]));
                        beat(seg[w][i][j], comb(seg[2 * w][i][1], seg[2 * w + 1][0][j]));
                }
        }
        // cerr << "for " << L << ' ' << R << endl;
        // cerr << seg[w][1][1][1] << ' ' << seg[w][0][0][0] << endl;
        return;
}

int32_t main()
{
        ios_base::sync_with_stdio(0);
        srand(time(0));
        //	cout << fixed << setprecision(10);
        //	cerr << fixed << setprecision(10);
        if (fopen("input.in", "r"))
        {
                freopen ("input.in", "r", stdin);
                freopen ("output.out", "w", stdout);
        }
        cin >> N;
        for (int i = 0; i < N; i++)
        {
                cin >> arr[i];
        }
        solve(1, 0, N - 1);
        for (int i = 1; i <= (N + 1) / 2; i++)
        {
                cout << seg[1][1][1][i] << '\n';
        }
        //	cerr << "time elapsed = " << (clock() / (CLOCKS_PER_SEC / 1000)) << " ms" << endl;
        return 0;
}

Compilation message (stderr)

candies.cpp: In function 'void beat(std::vector<long long int>&, std::vector<long long int>)':
candies.cpp:149:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int i = 0; i < b.size(); i++)
                         ~~^~~~~~~~~~
candies.cpp: In function 'std::vector<long long int> comb(std::vector<long long int>, std::vector<long long int>)':
candies.cpp:168:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         while(it != lt.size() || jt != rt.size())
               ~~~^~~~~~~~~~~~
candies.cpp:168:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         while(it != lt.size() || jt != rt.size())
                                  ~~~^~~~~~~~~~~~
candies.cpp:170:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
                 if (jt == rt.size() || (it != lt.size() && jt != rt.size() && lt[it] - lt[it - 1] >= rt[jt] - rt[jt - 1]))
                     ~~~^~~~~~~~~~~~
candies.cpp:170:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
                 if (jt == rt.size() || (it != lt.size() && jt != rt.size() && lt[it] - lt[it - 1] >= rt[jt] - rt[jt - 1]))
                                         ~~~^~~~~~~~~~~~
candies.cpp:170:63: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
                 if (jt == rt.size() || (it != lt.size() && jt != rt.size() && lt[it] - lt[it - 1] >= rt[jt] - rt[jt - 1]))
                                                            ~~~^~~~~~~~~~~~
candies.cpp:182:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int i = 1; i < res.size(); i++)
                         ~~^~~~~~~~~~~~
candies.cpp: In function 'int32_t main()':
candies.cpp:224:25: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
                 freopen ("input.in", "r", stdin);
                 ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
candies.cpp:225:25: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
                 freopen ("output.out", "w", stdout);
                 ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 92 / 92