Submission #756510

#	Time	Username	Problem	Language	Result	Execution time	Memory
756510		SlavicG	Sum Zero (RMI20_sumzero)	C++17	100 / 100	263 ms	20128 KiB

sumzero

//not my code
#include<bits/stdc++.h>
#define f first
#define s second
#define ll long long
#define pii pair<int,int>
using namespace std;
const int N = 4e5 + 1;
int jump[N], p[N], level[N];
unordered_map<ll, int> f;
main(){
    ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0);
    int n;
    cin >> n;
    ll tot = 0;
    int mx = -1;
    level[0] = 1;
    for(int i = 1; i <= n; i++) {
        int a; cin >> a;
        tot += a;
        if(f[tot] || !tot) mx = max(mx, f[tot]);
        f[tot] = i;
        p[i] = mx;
        if(mx == -1) level[i] = 1;
        else
        level[i] = level[p[i]] + 1;
        if(mx >= 0 && level[p[i]] - level[jump[p[i]]] == level[jump[p[i]]] - level[jump[jump[p[i]]]]) jump[i] = jump[jump[p[i]]];
        else jump[i] = p[i];
    }
    int q;
    cin >> q;
    while(q--) {
        int l, r;
        cin >> l >> r;
        int ans = 0; --l;
        while(r) {
            if(p[r] < l) break;
            if(jump[r] >= l) ans += level[r] - level[jump[r]], r = jump[r];
            else ans++, r = p[r];
        }
        cout << ans << "\n";
    }
 }

Compilation message (stderr)

sumzero.cpp:11:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   11 | main(){
      | ^~~~

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