This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
// 石室詩士施氏, 嗜獅, 誓食十獅。
// 氏時時適市視獅。
// 十時, 適十獅適市。
// 是時, 適施氏適市。
// 氏視是十獅, 恃矢勢, 使是十獅逝世。
// 氏拾是十獅屍, 適石室。
// 石室濕, 氏使侍拭石室。
// 石室拭, 氏始試食是十獅。
// 食時, 始識是十獅, 實十石獅屍。
// 試釋是事。
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define pii pair<int,int>
#define pb push_back
#define ppb pop_back
#define mp make_pair
#define f first
#define se second
template <typename T> void Max(T &a, T b) {
a = max(a, b);
}
template <typename T> void Min(T &a, T b) {
a = min(a, b);
}
const int inf = 0x3f3f3f3f;
const int N = 4e5 + 15;
int n, q, p[N], to[N];
map <int, int> last;
vector <int> qs[N];
int ans[N], d[N], l, r, mid;
int st[N], sz;
int R[N];
int prv[N], head[N];
void dfs(int v) {
st[sz++] = v;
while(!qs[v].empty()) {
l = 0, r = sz - 1;
while(l <= r) {
mid = l + r >> 1;
if(st[mid] <= R[qs[v].back()])
r = mid - 1, Max(ans[qs[v].back()], d[v] - d[st[mid]]);
else
l = mid + 1;
}
qs[v].ppb();
}
for(int to = head[v]; to != -1; to = prv[to]) {
d[to] = d[v] + 1;
dfs(to);
}
--sz;
}
int main() {
memset(head, -1, sizeof(head));
memset(prv, -1, sizeof(prv));
ios_base::sync_with_stdio(0), cout.tie(0), cin.tie(0);
// freopen("input.txt", "r", stdin);
cin >> n;
for(int i = 1; i <= n; ++i) {
cin >> p[i];
p[i] += p[i-1];
}
for(int i = 0; i <= n + 1; ++i)
to[i] = n + 1;
for(int i = n; i >= 0; --i) {
if(last.count(p[i]))
Min(to[i], last[p[i]]);
Min(to[i], to[i+1]);
prv[i] = head[to[i]];
head[to[i]] = i;
last[p[i]] = i;
}
cin >> q;
for(int i = 1; i <= q; ++i) {
int l;
cin >> l >> R[i];
qs[l - 1].pb(i);
}
dfs(n + 1);
for(int i = 1; i <= q; ++i)
cout << ans[i] << endl;
return 0;
}
Compilation message (stderr)
sumzero.cpp: In function 'void dfs(int)':
sumzero.cpp:46:12: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
46 | mid = l + r >> 1;
| ~~^~~
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