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;
#define ll long long
#define ull unsigned long long
#define ii pair<int, int>
#define mp make_pair
#define range(v) v.begin(), v.end()
#define sz(v) (int)v.size()
#define file(name) if(fopen(name".INP", "r")) {freopen(name".INP", "r", stdin); freopen(name".OUT", "w", stdout);}
#define usaco(name) if(fopen(name".in", "r")) {freopen(name".in", "r", stdin); freopen(name".out", "w", stdout);}
#define el "\n"
#define fi first
#define se second
template<typename T> bool maximize(T &res, const T &val) { if (res < val){ res = val; return true; }; return false; }
template<typename T> bool minimize(T &res, const T &val) { if (res > val){ res = val; return true; }; return false; }
const int N = 2e5 + 12;
int n, q;
struct node {
int val;
node *lpt, *rpt;
node(int x) : val(x), lpt(nullptr), rpt(nullptr) {}
node(node *cur) : val(cur -> val), lpt(cur -> lpt), rpt(cur -> rpt) {}
node(node *l, node *r) {
lpt = l; rpt = r;
val = (lpt == nullptr ? 0 : lpt -> val) + (rpt == nullptr ? 0 : rpt -> val);
}
};
node *build(int l, int r) {
if(l == r) return new node(0);
int m = (l + r) >> 1;
return new node(build(l, m), build(m + 1, r));
}
node *update(node *previous, int l, int r, int pos) {
if(l == r) return new node(previous -> val + 1);
int m = (l + r) >> 1;
if(pos <= m)
return new node(update(previous -> lpt, l, m, pos), previous -> rpt);
else
return new node(previous -> lpt, update(previous -> rpt, m + 1, r, pos));
}
int get(node *versionLeft, node *versionRight, int l, int r, int u, int v) {
if(r < u || v < l) return 0;
if(u <= l && r <= v) return (versionRight -> val) - (versionLeft -> val);
int m = (l + r) >> 1;
return get(versionLeft -> lpt, versionRight -> lpt, l, m, u, v) +
get(versionLeft -> rpt, versionRight -> rpt, m + 1, r, u, v);
}
node *ver[N];
void solve() {
cin >> n >> q;
ver[0] = build(0, N - 1);
for(int i = 1; i <= n; i++) {
int x; cin >> x;
ver[i] = update(ver[i - 1], 0, N - 1, x);
}
while(q--) {
int l, r; cin >> l >> r;
int left = 2, right = r - l + 1, res = 1;
while(left <= right) {
int mid = (left + right) >> 1;
if(get(ver[l - 1], ver[r], 0, N - 1, mid, N - 1) >= mid)
res = mid, left = mid + 1;
else
right = mid - 1;
}
cout << res << el;
}
}
signed main() {
ios_base::sync_with_stdio(0); cin.tie(0);
file("kurumi");
solve();
// cerr << el<< "Time elapsed: " << (1000.0 * clock() / CLOCKS_PER_SEC) << "ms.\n";
return 0;
}
/*
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*/
Compilation message (stderr)
index.cpp: In function 'int main()':
index.cpp:10:55: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
10 | #define file(name) if(fopen(name".INP", "r")) {freopen(name".INP", "r", stdin); freopen(name".OUT", "w", stdout);}
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
index.cpp:89:5: note: in expansion of macro 'file'
89 | file("kurumi");
| ^~~~
index.cpp:10:88: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
10 | #define file(name) if(fopen(name".INP", "r")) {freopen(name".INP", "r", stdin); freopen(name".OUT", "w", stdout);}
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
index.cpp:89:5: note: in expansion of macro 'file'
89 | file("kurumi");
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