Submission #316180

#	Time	Username	Problem	Language	Result	Execution time	Memory
316180		nikatamliani	The Big Prize (IOI17_prize)	C++14	20 / 100	75 ms	384 KiB

prize

#include <bits/stdc++.h>
using namespace std;
#include "prize.h"
int find_best(int n) {
    int next = -1, at_most = min(500, n);
    vector < int > bad(2);
    for(int i = 0; i <= at_most; ++i) {
        vector < int > cur = ask(i);
        if(bad[0] + bad[1] < cur[0] + cur[1]) bad = cur;
    }
    for(int i = 0; i < n; i = next) {
        int l = i, r = n - 1; next = -1;
        vector < int > t = ask(i);
        if(t[0] + t[1] != bad[0] + bad[1]) {
            next = i + 1;
            if(t[0] == 0 && t[1] == 0) return i; 
            continue;
        } 
        while(r >= l) {
            int m = l + r >> 1;
            vector < int > x = ask(m);
            if(x == t) {
                next = m;
                l = m + 1;
            } else {
                r = m - 1; 
            }
        }
        assert(next >= 0);
        vector < int > tt = ask(next);
        for(int j = next + 1; j < n; ++j) {
            vector < int > p = ask(j);
            if(p[0] + p[1] != bad[0] + bad[1]) {
                if(p[0] == 0 && p[1] == 0) return j;
                continue;
            }
            next = j;
            break;
        }
    }
    //this is bad
    for(int i = 0; i < n; ++i) {
        vector < int > p = ask(i);
        if(!p[0] && !p[1]) return i; 
    }
}

Compilation message (stderr)

prize.cpp: In function 'int find_best(int)':
prize.cpp:20:23: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   20 |             int m = l + r >> 1;
      |                     ~~^~~
prize.cpp:6:25: warning: control reaches end of non-void function [-Wreturn-type]
    6 |     vector < int > bad(2);
      |                         ^

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