Submission #820726

#	Time	Username	Problem	Language	Result	Execution time	Memory
820726		vjudge1	The Big Prize (IOI17_prize)	C++17	20 / 100	3060 ms	336 KiB

prize

#include "prize.h"
#include <bits/stdc++.h>

using namespace std;

// ask

map < int, pair < int, int > > mp;

pair < int, int >  check(int i) {
    auto it = mp.find(i);
    if(it != mp.end()) {
        return it->second;
    }
    mp[i];
    it = mp.find(i);
    auto res = ask(i);
    it->second = {res[0], res[1]};
    return it->second;
}

int recur(int l, int r) {
    int m = (l + r) / 2;
    auto [a, b] = check(m);
    if(a + b < 2) {
        return m;
    }
    if(a > b) {
        return recur(l, m);
    }
    return recur(m, r);
}

int find_best(int n) {
	int l = -1, r = n, m;
    for(; l != r;) {
        m = recur(l, r);    
        auto [a, b] = check(m);
        if(a|b) {
            (a ? r : l) = m;
        } else {
            break;
        }
    }
    return m;
}

Compilation message (stderr)

prize.cpp: In function 'int find_best(int)':
prize.cpp:45:12: warning: 'm' may be used uninitialized in this function [-Wmaybe-uninitialized]
   45 |     return m;
      |            ^

• Subtask 1: 20 / 20
• Subtask 2: 0 / 80