Submission #1209827

#	Time	Username	Problem	Language	Result	Execution time	Memory
1209827		lopkus	Sum Zero (RMI20_sumzero)	C++20	100 / 100	337 ms	21428 KiB

sumzero

//*** Bismillah ***//
#pragma GCC optimize("O3", "fast-math", "unroll-loops", "no-stack-protector")
#include <bits/stdc++.h>
using namespace std;
#if !defined(ONLINE_JUDGE) and !defined(EVAL)
#include "template/debug.h"
#else
#define d(x...)
#endif
#define fr first
#define er erase
#define sc second
#define in insert
#define ll int
#define pb push_back
#define vll vector<ll>
#define pll pair<ll,ll>
#define len(x)(ll)x.size()
#define all(x)x.begin(),x.end()
const ll INF = 1e9;
const ll INFL = 1e18;
const ll MOD = 1e9+7;
// const ll MOD = 998244353;
const ll maxn = 4e5+5;
ll n,m,k=0;
const ll lg = 9;
ll a[maxn], up[maxn][lg];
pll p[maxn];
void _(ll tt){
    cin>>n;
    ll pr = 0, pos = n + 1;
    up[0][0] = up[n+1][0] = n + 1;
    for(ll i = 1; i <= n; i ++) cin>>a[i], pr += a[i], p[i] = {pr, i}, up[i][0] = n + 1;
    sort(p, p + n + 1);
    for(ll i = 0; i <= n; i ++){
        if(p[i].fr == p[i - 1].fr) up[p[i - 1].sc][0] = p[i].sc;
    }
    for(ll i = n; i >= 0; i --){
        if(up[i][0] == 0) up[i][0] = 0;
        up[i][0] = min(up[i][0], up[i+1][0]);
    }
    for(ll i = 1; i < lg; i ++){
        for(ll j = 0; j <= n + 1; j ++){
            up[j][i] = up[up[up[up[j][i-1]][i-1]][i-1]][i-1]; // 4^i-th parent
        }
    }
    cin>>m;
    for(ll i = 1, l, r; i <= m; i ++){
        cin>>l>>r;
        l --;
        ll cv = 0;
        for(ll i = lg - 1, pw = 65536; i >= 0; i --, pw /= 4){
            if(up[l][i] <= r and up[l][i] != 0){
                cv += pw;
                l = up[l][i];
            }
            if(up[l][i] <= r and up[l][i] != 0){
                cv += pw;
                l = up[l][i];
            }
            if(up[l][i] <= r and up[l][i] != 0){
                cv += pw;
                l = up[l][i];
            }
            if(up[l][i] <= r and up[l][i] != 0){
                cv += pw;
                l = up[l][i];
            }
        }
        cout<<cv<<'\n';
    }
}
signed main(){
    ll tm=clock();
    cin.tie(0)->sync_with_stdio(0);
    ll t=1;
    // cin>>t;
    for(ll tt=1;tt<=t;tt++){
        _(tt);
    }
    cerr<<"\n\033[1;31mTime: \033[1;30m" \
        <<(double)(clock()-tm)/1000000<<"\033[1;32m seconds\n";
}

Compilation message (stderr)

sumzero.cpp:21:17: warning: overflow in conversion from 'double' to 'int' changes value from '1.0e+18' to '2147483647' [-Woverflow]
   21 | const ll INFL = 1e18;
      |                 ^~~~

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