Submission #950166

#	Time	Username	Problem	Language	Result	Execution time	Memory
950166		TrieTr	Sum Zero (RMI20_sumzero)	C++14	0 / 100	3 ms	6748 KiB

sumzero

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

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

#define ll long long
#define fi first
#define se second
#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 = 1e6 + 5;
const int LG = 19;

int n, q;
int arr[N];
map<ll, int> pos;
int nxt[N];
int depth[N];
bool vis[N];
int node_id[N], par[N], h[N], jump[N], cur_pos[N];

void make_leaf(int id, int p) {
	par[id] = 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;
	}
	cur_pos[0] = n + 1;
	for(int i = n, id = 0; i > 0; i--) {
		int u = nxt[i];
		if(vis[u] || u > n) continue;
		vis[u] = true; id++;
		int p = node_id[nxt[u + 1]];
		make_leaf(id, p);
		node_id[u] = id; cur_pos[id] = u;
	}
	/*for(int i = 1; i <= n; i++) {
		int id = node_id[i];
		cout << i << ' ' << id << ' ' << par[id] << ' ' << h[id] << ' ' << jump[id] << ' ' << cur_pos[id] << '\n';
	}*/
	cin >> q;
	while(q--) {
		int l, r; cin >> l >> r;
		l = nxt[l];
		int res = 0, id;
		if(l <= r) id = node_id[l];
		while(cur_pos[id] <= r) {
			if(cur_pos[jump[id]] <= r) {
				res += h[id] - h[jump[id]];
				id = jump[id];
			}
			else {
				res++;
				id = par[id];
			}
			//cout << tmp << ' ' << id << ' ' <<  h[tmp] << ' ' << h[id] << ' ' << res << '\n';
		}
		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);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
sumzero.cpp: In function 'int main()':
sumzero.cpp:70:19: warning: 'id' may be used uninitialized in this function [-Wmaybe-uninitialized]
   70 |   while(cur_pos[id] <= r) {
      |         ~~~~~~~~~~^

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