Submission #1110492

#	Time	Username	Problem	Language	Result	Execution time	Memory
1110492		Zero_OP	Sum Zero (RMI20_sumzero)	C++14	100 / 100	343 ms	19784 KiB

sumzero

#include <bits/stdc++.h>

using namespace std;

#define rep(i, l, r) for(int i = (l); i < (r); ++i)
#define sz(v) (int)v.size()
#define dbg(x) "[" #x " = " << (x) << "]"
#define all(v) begin(v), end(v)
#define compact(v) v.erase(unique(all(v)), end(v))
#define file(name) if(fopen(name".inp", "r")){ freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }

template<typename T>
    bool minimize(T& a, const T& b){
        if(a > b){
            return a = b, true;
        }
        return false;
    }

template<typename T>
    bool maximize(T& a, const T& b){
        if(a < b){
            return a = b, true;
        }
        return false;
    }

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

using ll = long long;
using ld = long double;
using ull = unsigned long long;
using vi = vector<int>;
using vl = vector<ll>;

const int MAX = 4e5 + 2;
const int L = 5;

int N, a[MAX], pw16[L], lift[L][MAX], p[MAX];
long long pref[MAX];

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    //file("task");

    cin >> N;
    long long sum = 0;
    for(int i = 1; i <= N; ++i){
        cin >> a[i];
        pref[i] = pref[i - 1] + a[i];
        p[i] = i;
    }

    memset(lift, 0x3f, sizeof(lift));
    int inf = lift[0][0];
    sort(p, p + N + 1, [&](int i, int j){ return (pref[i] < pref[j]) || (pref[i] == pref[j] && i < j); });

    for(int i = 0; i <= N; ++i){
        while(i < N && pref[p[i]] == pref[p[i + 1]]){
            if(p[i] < N) lift[0][p[i] + 1] = p[i + 1] + 1;
            ++i;
        }

        if(p[i] < N) lift[0][p[i] + 1] = inf;
    }

    pw16[0] = 1;
    pw16[1] = 16;
    for(int i = 2; i < L; ++i){
        pw16[i] = pw16[i - 1] * 16;
    }

    for(int i = N - 1; i >= 1; --i){
        minimize(lift[0][i], lift[0][i + 1]);
    }

    for(int i = 1; i < L; ++i){
        for(int j = 1; j <= N; ++j){
            lift[i][j] = j;
            for(int rep = 0; rep < 16; ++rep){
                if(lift[i][j] == inf) break;
                lift[i][j] = lift[i - 1][lift[i][j]];
            }
        }
    }

    int Q, l, r, ans = 0;
    cin >> Q;
    while(Q--){
        cin >> l >> r;
        ++r; ans = 0;
        for(int i = L - 1; i >= 0; --i){
            while(lift[i][l] <= r){
                ans += pw16[i];
                l = lift[i][l];
            }
        }

        cout << ans << '\n';
    }

    return 0;
}

Compilation message (stderr)

sumzero.cpp: In function 'int main()':
sumzero.cpp:49:15: warning: unused variable 'sum' [-Wunused-variable]
   49 |     long long sum = 0;
      |               ^~~

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