제출 #1321646

#제출 시각아이디문제언어결과실행 시간메모리
1321646kasamchi커다란 상품 (IOI17_prize)C++20
97.95 / 100
18 ms5268 KiB
#include "prize.h"
#include <bits/stdc++.h>
using namespace std;

vector<vector<int>> buf;

vector<int> qry(int x) {
    if (buf[x].empty()) {
        return buf[x] = ask(x);
    } else {
        return buf[x];
    }
}

int bcnt;
vector<int> tar;

void dfs(int l, int r, int cnt, int lp, int rs) {
    if (l == r) {
        tar.push_back(l);
    } else {
        int rm = l + (r - l) / 2, lm = rm;
        vector<int> res = qry(lm);
        while (res[0] + res[1] < bcnt) {
            tar.push_back(lm);
            lm--;
            if (lm < l) {
                break;
            }
            res = qry(lm);
        }
        int lc = res[0] - lp;
        if (lc > 0) {
            dfs(l, lm - 1, lc, lp, res[1]);
        }

        lm = rm;
        res = qry(lm);
        while (res[0] + res[1] < bcnt) {
            tar.push_back(lm);
            lm++;
            if (lm > r) {
                break;
            }
            res = qry(lm);
        }
        int rc = res[1] - rs;
        if (rc > 0) {
            dfs(lm + 1, r, rc, res[0], rs);
        }
    }
}

int find_best(int n) {
    buf.clear(), buf.resize(n);
    for (int i = 0; i < min(n, 447); i++) {
        vector<int> res = qry(i);
        bcnt = max(bcnt, res[0] + res[1]);
    }
    dfs(0, n - 1, bcnt, 0, 0);

    for (int x : tar) {
        vector<int> res = qry(x);
        if (res[0] + res[1] == 0) {
            return x;
        }
    }
}

컴파일 시 표준 에러 (stderr) 메시지

prize.cpp: In function 'int find_best(int)':
prize.cpp:68:1: warning: control reaches end of non-void function [-Wreturn-type]
   68 | }
      | ^
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