Submission #950341

#	Time	Username	Problem	Language	Result	Execution time	Memory
950341		TrieTr	Sum Zero (RMI20_sumzero)	C++14	61 / 100	234 ms	22280 KiB

sumzero

#include<bits/stdc++.h>
using namespace std;

void local() {
    #define taskname "test"
    if (fopen(taskname".inp", "r")) {
        freopen(taskname".inp", "r", stdin);
        freopen(taskname".out", "w", stdout);
    }
}

#define ll long long
#define fastio ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);

template<class X, class Y> bool mini(X &a, const Y &b) {return (a > b) ? a = b, true : false;}
template<class X, class Y> bool maxi(X &a, const Y &b) {return (a < b) ? a = b, true : false;}

const int N = 4e5 + 5;

int n, q, res;
int arr[N];
map<ll, int> pos;
bitset<N> vis;
int nxt[N];
int h[N], jump[N];

void make_leaf(int& id, int& p) {
	h[id] = h[p] + 1;
	if(h[jump[p]] - h[p] == h[jump[jump[p]]] - h[jump[p]]) jump[id] = jump[jump[p]];
	else jump[id] = p;
}
int main() {
    fastio; local();
    cin >> n;
    for(int i = 1; i <= n; i++) cin >> arr[i];
    ll sum = 0;
    nxt[n + 1] = n + 1;
    pos[0] = n + 1;
    for(int i = n; i > 0; i--) {
    	sum += arr[i];
    	nxt[i] = pos[sum] - 1;
    	if(nxt[i] == -1) nxt[i] = nxt[i + 1];
    	else mini(nxt[i], nxt[i + 1]);
    	pos[sum] = i;
	}
	for(int i = n; i > 0; i--) {
		int u = nxt[i];
		if(vis[u] || u > n) continue;
		vis.set(u);
		int p = nxt[u + 1];
		h[u] = h[p] + 1;
        if(h[jump[p]] - h[p] == h[jump[jump[p]]] - h[jump[p]]) jump[u] = jump[jump[p]];
        else jump[u] = p;
	}
	cin >> q;
	while(q--) {
		int l, r; cin >> l >> r;
		l = nxt[l];
        if(l > r) {
            cout << "0\n"; continue;
        }
        res = 0;
		while(l <= r && l != 0) {
			if(jump[l] <= r && jump[l] != 0) {
				res += h[l] - h[jump[l]];
				l = jump[l];
			}
			else {
				res++;
				l = nxt[l + 1];
			}
		}
		cout << res << '\n';
	}
}

Compilation message (stderr)

sumzero.cpp: In function 'void local()':
sumzero.cpp:7:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    7 |         freopen(taskname".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
sumzero.cpp:8:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    8 |         freopen(taskname".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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