Submission #944961

#	Time	Username	Problem	Language	Result	Execution time	Memory
944961		vjudge1	Sum Zero (RMI20_sumzero)	C++14	61 / 100	245 ms	26392 KiB

sumzero

#include <bits/stdc++.h>

using namespace std;

const int maxN  = 4e5 + 5;

long long query[maxN];
long long get_l(const long long &num)
{
    return num & ((1LL << 19) - 1LL);
}
long long get_r(const long long &num)
{
    return (num >> 19) & ((1LL << 19) - 1LL);
}
long long get_idx(const long long &num)
{
    return (num >> 38) & ((1LL << 19) - 1LL);
}

bool cmp_query(const long long &a, const long long &b)
{
    return get_l(a) > get_l(b);
}

vector<pair<long long, int> > helper;
vector<pair<long long, int> >::iterator v_iter;

int S[maxN + 5], S_si = 0;
int lq[maxN], val[maxN];
int last_l;
int calc(const int &l, const int &r)
{
    S_si = 0;
    int tr = r;
    while(l <= tr)
    {
        if(val[tr])last_l = lq[tr];
        S[S_si++] = tr;
        tr = lq[tr] - 1;
    }

    int pr = l - 1;
    while(S_si)
    {
        val[S[S_si-1]] += val[pr]; //cout << "Calc " << l << ' ' << S.back() << ' ' << val[S.back()] << '\n';
        lq[S[S_si-1]] = (val[S[S_si-1]] ? last_l : l);
        pr = S[S_si-1];
        S_si--;
    }
    return val[r];
}

int re[maxN];
int res[maxN];
int n, q;
int main()
{
    if(fopen("input.txt", "r"))
    {
        freopen("input.txt", "r", stdin);
    }
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    cin >> n;
    val[0] = 0;
    for(int i = 1; i <= n; ++i)
    {
        cin >> re[i];
        lq[i] = i;
        val[i] = 0;
    }

    cin >> q;
    long long l, r, idx;
    for(int i = 1; i <= q; ++i)
    {
        cin >> l >> r;
        idx = i;
        query[i] = l | (r << 19) | (idx << 38);
    }
    sort(query + 1, query + q + 1, cmp_query);

    long long sum = 0;
    for(int i = n; i > 0; --i)
    {
        sum += re[i];
        helper.push_back(make_pair(sum, i));
    }
    helper.push_back(make_pair(0, n + 1));
    sort(helper.begin(), helper.end());
    sum = 0;
    for(int i = n; i > 0; --i)
    {
        sum += re[i];
        re[i] = -1;
        v_iter = upper_bound(helper.begin(), helper.end(), make_pair(sum, i));
        if(v_iter != helper.end() && v_iter->first == sum)
            re[i] = v_iter->second - 1;
    }
    /**------------**/

    int itl = n;
    for(int i = 1; i <= q; ++i)
    {
        while(itl >= get_l(query[i]))
        {
            if(re[itl] != -1)
            {
                calc(itl, re[itl]);
                if(!val[re[itl]])
                {
                    val[re[itl]] = 1;
                    lq[re[itl]] = itl;
                    for(int j = re[itl] + 1; j <= n; ++j)
                        if(val[j])break;
                        else lq[j] = re[itl] + 1;
                }
            }
            itl--;
        }
        res[get_idx(query[i])] = calc(get_l(query[i]), get_r(query[i]));
    }
    for(int i = 1; i <= q; ++i)
        cout << res[i] << '\n';

    return 0;
}

Compilation message (stderr)

sumzero.cpp: In function 'int main()':
sumzero.cpp:61:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   61 |         freopen("input.txt", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 22 / 22
• Subtask 2: 39 / 39
• Subtask 3: 0 / 39