제출 #1086490

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1086490		lmToT27	Financial Report (JOI21_financial)	C++17	0 / 100	110 ms	25776 KiB

Main

#include <bits/stdc++.h>
#define ll long long

using namespace std;

const int MAX = 3e5 + 3;
const ll mod = 1e9 + 7;

int n, D;
int maxVal[MAX << 1];

void modify(int i, int val) {
        i += n;
        maxVal[i] = val;
        for (; i > 1; i >>= 1) maxVal[i >> 1] = max(maxVal[i], maxVal[i ^ 1]);
}

int get(int l, int r) {
        int res = 0;
        for (l += n, r += n; l < r; l >>= 1, r >>= 1) {
                if (l & 1) res = max(res, maxVal[l++]);
                if (r & 1) res = max(res, maxVal[--r]);
        }
        return res;
}

void Solve() {
        cin >> n >> D;
        vector <int> a(n);
        vector <int> id(n);
        vector <int> pa(n);
        vector <int> mn(n);
        vector <int> dp(n);

        for (int &x : a) cin >> x;

        iota(pa.begin(), pa.end(), 0);
        iota(mn.begin(), mn.end(), 0);
        iota(id.rbegin(), id.rend(), 0);
        sort(id.begin(), id.end(), [&](const int &i, const int &j) {
                return a[i] < a[j];
        });

        function <int(int)> findpa = [&](int i) -> int {
                return i == pa[i] ? i : pa[i] = findpa(pa[i]);
        };

        auto join = [&](int u, int v) -> void {
                u = findpa(u);
                v = findpa(v);
                if (u == v) return;
                pa[v] = u;
                mn[u] = min(mn[u], mn[v]);
        };

        set <int> S;
        for (int &i : id) {
                auto p = S.lower_bound(i);
                if (p != S.end() && *p - i <= D) join(*p, i);
                if (p != S.begin() && i - *(prev(p)) <= D) join(i, *prev(p));
                S.insert(i);
                dp[i] = get(mn[findpa(i)], i) + 1;
                modify(i, dp[i]);
        }

        cout << *max_element(dp.begin(), dp.end());
}

int main() {
        ios_base::sync_with_stdio(0);
        cin.tie(0);

        #define TASK "TASK"
        if (fopen(TASK".INP", "r")) {
                freopen(TASK".INP", "r", stdin);
                freopen(TASK".OUT", "w", stdout);
        }

        Solve();

        return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

Main.cpp: In function 'int main()':
Main.cpp:75:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   75 |                 freopen(TASK".INP", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:76:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |                 freopen(TASK".OUT", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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