# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
942739 | ShadowShark | Sum Zero (RMI20_sumzero) | C++17 | 644 ms | 29976 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
const int maxN = 4e5 + 9;
int a[maxN], jump[9][maxN];
map<long long, int> appear;
vector<pair<int, int>> segment;
int main() {
ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
int n;
cin >> n;
for (int i = 1; i <= n; i++)
cin >> a[i];
appear[0] = 0;
long long sum = 0;
for (int i = 1; i <= n; i++) {
sum = sum + a[i];
if (appear[sum] != 0)
segment.push_back({i, appear[sum] + 1});
else if (sum == 0)
segment.push_back({i, 1});
appear[sum] = i;
}
sort(segment.begin(), segment.end());
int curr = 0;
jump[0][n + 1] = n + 1;
for (int i = 0; i <= n; i++) {
while (curr < segment.size() && i >= segment[curr].second) curr++;
if (curr == segment.size()) jump[0][i] = n + 1;
else jump[0][i] = segment[curr].first;
}
for (int i = 1; i <= 8; i++)
for (int j = 0; j <= n + 1; j++)
jump[i][j] = jump[i - 1][jump[i - 1][j]];
int q;
cin >> q;
while (q--) {
int l, r;
cin >> l >> r;
int ans = 0; l--;
for (int i = 8; i >= 0; i--)
while (jump[i][l] <= r) {
l = jump[i][l];
ans += 1 << i;
}
cout << ans << '\n';
}
return 0;
}
Compilation message (stderr)
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