Submission #969051

#	Time	Username	Problem	Language	Result	Execution time	Memory
969051		12345678	Sum Zero (RMI20_sumzero)	C++17	61 / 100	205 ms	22048 KiB

sumzero

#include <bits/stdc++.h>

using namespace std;

const int nx=4e5+5, kx=19;

#define ll long long

int n, q, a[nx], l[nx], r[nx], vl[nx], dp[2][nx], res[nx];
unordered_map<ll, int> mp;
ll qs;

void build(int x)
{
    for (int i=1; i<=n; i++) dp[0][i]=vl[i];
    for (int i=1; i<=x; i++)
    {
        int c=i%2, p=1-c;
        for (int j=1; j<=n; j++) dp[c][j]=dp[p][max(dp[p][j]-1, 0)];
    }
}

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n;
    for (int i=1; i<=n;i ++) cin>>a[i];
    mp[0]=1;
    for (int i=1; i<=n; i++)
    {
        qs+=a[i];
        if (mp.find(qs)!=mp.end()) vl[i]=mp[qs];
        mp[qs]=i+1;
    }
    mp.clear();
    for (int i=1; i<=n; i++) vl[i]=max(vl[i], vl[i-1]);
    cin>>q;
    for (int i=1; i<=q; i++) cin>>l[i]>>r[i];
    for (int i=kx-1; i>=0; i--)
    {
        build(i);
        for (int j=1; j<=q; j++) if (dp[i%2][r[j]]>=l[j]) r[j]=dp[i%2][r[j]]-1, res[j]+=(1<<i);
    }
    for (int i=1; i<=q; i++) cout<<res[i]<<'\n';
}

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