Submission #405605

#	Time	Username	Problem	Language	Result	Execution time	Memory
405605		kostia244	Counting Mushrooms (IOI20_mushrooms)	C++17	89.33 / 100	22 ms	372 KiB

mushrooms

#include "mushrooms.h"
#include<bits/stdc++.h>
using namespace std;
const int C = 80;
int count_mushrooms(int n) {
   	vector<int> a{0}, b;
   	for(int i = 1; i < min(n, C); i++) {
   		if(max(a.size(), b.size()) > 1 && i+2 < min(n, C)) {
   			if(a.size()>1) {
   				int t = use_machine({a[0], i, a[1], i+1});
   				((t&2) ? b : a).push_back(i);
   				((t&1) ? b : a).push_back(i+1);
   			} else {
   				int t = use_machine({b[0], i, b[1], i+1});
   				((t&2) ? a : b).push_back(i);
   				((t&1) ? a : b).push_back(i+1);
   			}
   			i++;
   		} else
   			(use_machine({0, i}) ? b : a).push_back(i);
   	}
   	int acc = a.size(), T = 0;
   	if(a.size() < b.size()) swap(a, b), T = 1;
   	for(int pos = C; pos < n;) {
   		vector<int> cur;
   		for(int i = 0; i < a.size(); i++) {
   			if(pos < n) cur.push_back(pos++);
   			cur.push_back(a[i]);
   		}
   		//for(auto i : cur) cout << i << " "; cout << endl;
   		int t = use_machine(cur);
		int res = cur[0] * (t&1 ? -1 : 1);
   		t += t&1;
   		acc += T ? (t/2) : ((cur.size() - a.size()) - t/2);
   		//cout << acc << endl;
		(res < 0 ? b : a).push_back(abs(res));
   		if(a.size() < b.size()) swap(a, b), T ^= 1;
   	}
   	return acc;
}

Compilation message (stderr)

mushrooms.cpp: In function 'int count_mushrooms(int)':
mushrooms.cpp:26:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |      for(int i = 0; i < a.size(); i++) {
      |                     ~~^~~~~~~~~~

• Subtask 1: 89.3281 / 100