Submission #851455

#	Time	Username	Problem	Language	Result	Execution time	Memory
851455		heeheeheehaaw	Sum Zero (RMI20_sumzero)	C++17	0 / 100	11 ms	4700 KiB

sumzero

#include <bits/stdc++.h>

using namespace std;

int v[400005], st[400005];
int dp[400005];
typedef long long ll;

int main()
{
    int n, q;
    cin>>n;
    ll mv = 0;
    map<ll, int> mp;
    vector<pair<int, int>> intv;
    for(int i = 1; i <= n; i++)
    {
        cin>>v[i];
        st[i] = mp[-(v[i] + mv)];
        if(v[i] == 0)
            st[i] = i;
        if(st[i] != 0)
            intv.push_back({st[i], i});
        st[i] = -1;
        mv += v[i];
        mp[(ll)v[i] - mv] = max(mp[(ll)v[i] - mv], i);
    }

    if(intv.empty())
    {
        cin>>q;
        for(int i = 1; i <= q; i++)
        {
            int a;
            cin>>a>>a;
            cout<<0<<'\n';
        }
        return 0;
    }

    int maxst = intv.front().first;
    st[intv.front().second] = maxst;
    for(int i = 1; i < intv.size(); i++)
    {
        if(intv[i].first > maxst)
            st[intv[i].second] = intv[i].first;
        maxst = max(maxst, intv[i].first);
    }

    intv.clear();
    for(int i = 1; i <= n; i++)
    {
        dp[i] = dp[i - 1];
        if(st[i] != -1)
        {
            intv.push_back({st[i], i});
            dp[i] = max(dp[i], 1 + dp[st[i] - 1]);
        }
    }

    cin>>q;
    for(int i = 1; i <= q; i++)
    {
        int a, b;
        cin>>a>>b;
        int l = 0, r = (int)intv.size() - 1, mij, poz = -1;
        while(l < r)
        {
            mij = (l + r) / 2;
            if(a - 1 < intv[mij].first)
                r = mij - 1;
            else if(a - 1 > intv[mij].second)
                l = mij + 1;
            else
                poz = mij, l = mij + 1;
        }

        if(poz == -1)
            cout<<dp[b]<<'\n';
        else if(intv[poz].second > b)
            cout<<0<<'\n';
        else
            cout<<dp[b] - dp[intv[poz].second]<<'\n';
    }

    return 0;
}

Compilation message (stderr)

sumzero.cpp: In function 'int main()':
sumzero.cpp:43:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |     for(int i = 1; i < intv.size(); i++)
      |                    ~~^~~~~~~~~~~~~

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