oj.uz

Submission #924938

# Submission time Handle Problem Language Result Execution time Memory
924938 2024-02-10T05:21:56 Z shidou26 Index (COCI21_index) C++14
110 / 110
 1250 ms 133000 KB 
#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

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");
      |     ^~~~

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 13400 KB Output is correct
2 Correct 12 ms 13404 KB Output is correct
3 Correct 12 ms 13404 KB Output is correct
4 Correct 12 ms 13404 KB Output is correct
5 Correct 12 ms 13404 KB Output is correct
6 Correct 12 ms 13404 KB Output is correct
7 Correct 12 ms 13448 KB Output is correct
8 Correct 12 ms 13404 KB Output is correct
9 Correct 12 ms 13404 KB Output is correct
10 Correct 12 ms 13404 KB Output is correct

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 13400 KB Output is correct
2 Correct 12 ms 13404 KB Output is correct
3 Correct 12 ms 13404 KB Output is correct
4 Correct 12 ms 13404 KB Output is correct
5 Correct 12 ms 13404 KB Output is correct
6 Correct 12 ms 13404 KB Output is correct
7 Correct 12 ms 13448 KB Output is correct
8 Correct 12 ms 13404 KB Output is correct
9 Correct 12 ms 13404 KB Output is correct
10 Correct 12 ms 13404 KB Output is correct
11 Correct 173 ms 42828 KB Output is correct
12 Correct 181 ms 43312 KB Output is correct
13 Correct 177 ms 42836 KB Output is correct
14 Correct 178 ms 43088 KB Output is correct
15 Correct 176 ms 42832 KB Output is correct
16 Correct 174 ms 42832 KB Output is correct
17 Correct 181 ms 43348 KB Output is correct
18 Correct 175 ms 42832 KB Output is correct
19 Correct 175 ms 42728 KB Output is correct
20 Correct 185 ms 43236 KB Output is correct

Subtask #3
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 13400 KB Output is correct
2 Correct 12 ms 13404 KB Output is correct
3 Correct 12 ms 13404 KB Output is correct
4 Correct 12 ms 13404 KB Output is correct
5 Correct 12 ms 13404 KB Output is correct
6 Correct 12 ms 13404 KB Output is correct
7 Correct 12 ms 13448 KB Output is correct
8 Correct 12 ms 13404 KB Output is correct
9 Correct 12 ms 13404 KB Output is correct
10 Correct 12 ms 13404 KB Output is correct
11 Correct 173 ms 42828 KB Output is correct
12 Correct 181 ms 43312 KB Output is correct
13 Correct 177 ms 42836 KB Output is correct
14 Correct 178 ms 43088 KB Output is correct
15 Correct 176 ms 42832 KB Output is correct
16 Correct 174 ms 42832 KB Output is correct
17 Correct 181 ms 43348 KB Output is correct
18 Correct 175 ms 42832 KB Output is correct
19 Correct 175 ms 42728 KB Output is correct
20 Correct 185 ms 43236 KB Output is correct
21 Correct 1216 ms 132996 KB Output is correct
22 Correct 1193 ms 132704 KB Output is correct
23 Correct 1178 ms 132688 KB Output is correct
24 Correct 1179 ms 132848 KB Output is correct
25 Correct 1250 ms 132880 KB Output is correct
26 Correct 1214 ms 132608 KB Output is correct
27 Correct 1174 ms 132628 KB Output is correct
28 Correct 1229 ms 133000 KB Output is correct
29 Correct 1164 ms 132580 KB Output is correct
30 Correct 1237 ms 132688 KB Output is correct