제출 #924938

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
924938		shidou26	Index (COCI21_index)	C++14	110 / 110	1250 ms	133000 KiB

index

#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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*/

컴파일 시 표준 에러 (stderr) 메시지

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 / 20
• Subtask 2: 40 / 40
• Subtask 3: 50 / 50