Submission #1145286

#	Time	Username	Problem	Language	Result	Execution time	Memory
1145286		0pt1mus23	Sum Zero (RMI20_sumzero)	C++20	61 / 100	99 ms	16724 KiB

sumzero

#pragma GCC optimize("O1")
// #pragma GCC optimize("O3,unroll-loops")
// #pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#include <bits/stdc++.h>
using namespace std;
// #define int long long int
#define ins insert
#define pb  push_back
#define pii pair<int,int>
#define endl '\n' 
#define all(x) x.begin(),x.end()

const int mod = 998244353;
const int inf = INT_MAX;
const int LG  = 18;
const int sze = 1e5+23;

int dp[LG][sze];

void fast(){
    int n;
    cin>>n;
    vector<int> arr(n);
    for(int i=1;i<=n;i++){
        cin>>arr[i];
    }
    for(int i =0;i<LG;i++){
        for(int j=0;j<sze;j++){
            dp[i][j]=inf;
        }
    }

    map<int,int> last;
    last[0]=n+1;
    int sum=0;
    for(int i = n;i>=1;i--){
        sum+=arr[i];
        dp[0][i]=dp[0][i+1];
        if(last.count(sum)){
            dp[0][i]=min(dp[0][i],last[sum]);
        }

        last[sum]=i;
    }

    for(int i=1;i<LG;i++){
        for(int j=1;j<=n;j++){
            if(dp[i-1][j]!=inf){
                dp[i][j]=dp[i-1][dp[i-1][j]];
            }
        }
    }
    // cout<<dp[2][1]<<endl;
    int q;
    cin>>q;
    while(q--){
        int l,r;
        cin>>l>>r;
        int res=0;
        for(int i = LG-1;i>=0;i--){
            if(dp[i][l]<=r+1){
                res|=(1<<i);
                // cout<<i<<" :"<<l<<" "<<dp[i][l]<<endl;
                l=dp[i][l];
            }
        }
        cout<<res<<endl;
    }
}

signed main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int tt =1;

    // cin>>tt;
    while(tt--){
        fast();
    }

    return 0;
}

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