제출 #613961

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
613961		drdilyor	커다란 상품 (IOI17_prize)	C++17	90 / 100	86 ms	400 KiB

prize

#include <bits/stdc++.h>
#include "prize.h"
#ifdef ONPC
    #include "t_debug.cpp"
#else
    #define debug(...) 42
#endif
#define sz(a) ((int)(a).size())
using namespace std;
using ll = long long;
const int INF = 1e9;
const ll INFL = 1e18;
const int RANDOM = chrono::high_resolution_clock::now().time_since_epoch().count();
mt19937 rng(RANDOM);
template<typename T, typename U> istream& operator>>(istream& is, pair<T, U>& p) { return is >> p.first >> p.second; }
const int N = 2e5, LOGN = 17, MOD = 1e9+7;

int find_best(int n) {
    vector<int> res;
    int mx = 0, L = 0, R = n-1;
    for (int i = 0; i < min(n, 500); i++) {
        res = ask(i);
        if (res[0] + res[1] > mx) {
            mx = res[0] + res[1];
            L = i;
        } else if (res[0] + res[1] == 0) {
            return i;
        }
    }
    for (; R >= L; R--) {
        res = ask(R);
        if (res[0] + res[1] == mx) break;
        else if (res[0] + res[1] == 0) return R;
    }

    int ans = -1;
    function<void(int,int,int)> solve = [&](int L, int R, int count)->void {
        if (count <= 0) return;
        if (L > R) return;
        if (~ans) return;
        if (R - L + 1 == count) {
            for (int i = L; i <= R; i++) {
                auto res = ask(i);
                if (res[0] + res[1] == 0) ans = i;
                break;
            }
            return;
        }
        vector<int> res;
        while (true) {
            res = ask(L);
            if (res[0] + res[1] == 0) {
                ans = L;
                return;
            }else if (res[0] + res[1] == mx) break;
            else {L++; count--;}
        }
        int mid1 = (L + R) / 2;
        int mid2 = mid1;
        while (true) {
            auto res2 = ask(mid2);
            if (res2[0] + res2[1] < mx) {
                if (res2[0] + res2[1] == 0) {
                    ans = mid2;
                    return;
                }
                mid2++;
            } else {
                int rem = mid2 - mid1;
                int count1 = res2[0] - res[0] - rem;
                int count2 = count - count1 - rem;
                solve(L+1, mid1-1, count1);
                solve(mid2+1, R, count2);
                return;
            }
        }
    };
    debug(mx, L, R, res);
    solve(L, R, res[0]);
    return ans;
}

/*
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▒▒████████ █████    ▒▒████████ █████ █████ ▒▒███████ ▒▒██████  █████    
 ▒▒▒▒▒▒▒▒ ▒▒▒▒▒      ▒▒▒▒▒▒▒▒ ▒▒▒▒▒ ▒▒▒▒▒   ▒▒▒▒▒███  ▒▒▒▒▒▒  ▒▒▒▒▒     
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*/

컴파일 시 표준 에러 (stderr) 메시지

prize.cpp: In function 'int find_best(int)':
prize.cpp:6:24: warning: statement has no effect [-Wunused-value]
    6 |     #define debug(...) 42
      |                        ^~
prize.cpp:78:5: note: in expansion of macro 'debug'
   78 |     debug(mx, L, R, res);
      |     ^~~~~

• Subtask 1: 20 / 20
• Subtask 2: 70 / 80