Submission #1033340

#	Time	Username	Problem	Language	Result	Execution time	Memory
1033340		happy_node	Counting Mushrooms (IOI20_mushrooms)	C++17	80.71 / 100	7 ms	700 KiB

mushrooms

#include "mushrooms.h"
#include <bits/stdc++.h>
using namespace std;

int count_mushrooms(int N) {
	vector<int> posA, posB;
	posA.push_back(0);
 
	int ans=posA.size();

	for(int i=1;i<N;i++) {
		if(posA.size()>posB.size()) {
			int s=posA.size();
			vector<int> qry;
			for(int j=i;j<min(N,i+s);j++) {
				qry.push_back(posA[j-i]);
				qry.push_back(j);
			}	

			int w=use_machine(qry);
			if(w&1) posB.push_back(qry.back());
			else posA.push_back(qry.back());

			w=(w+1)/2;
			ans+=(qry.size()/2-w);
			i+=s-1;

			if(w==qry.size()/2) {
				for(int j=1;j+1<qry.size();j+=2) {
					posB.push_back(qry[j]);
				}
			} else if(w==0) {
				for(int j=1;j+1<qry.size();j+=2) {
					posA.push_back(qry[j]);
				}
			}
		} else {
			int s=posB.size();
			vector<int> qry;
			for(int j=i;j<min(N,i+s);j++) {
				qry.push_back(posB[j-i]);
				qry.push_back(j);
			}	

			int w=use_machine(qry);
			if(w&1) posA.push_back(qry.back());
			else posB.push_back(qry.back());
			w=(w+1)/2;

			if(w==qry.size()/2) {
				for(int j=1;j+1<qry.size();j+=2) {
					posA.push_back(qry[j]);
				}
			} else if(w==0) {
				for(int j=1;j+1<qry.size();j+=2) {
					posB.push_back(qry[j]);
				}
			}

			ans+=w;
			i+=s-1;
		}
	}
 
	return ans;
}

Compilation message (stderr)

mushrooms.cpp: In function 'int count_mushrooms(int)':
mushrooms.cpp:28:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |    if(w==qry.size()/2) {
      |       ~^~~~~~~~~~~~~~
mushrooms.cpp:29:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |     for(int j=1;j+1<qry.size();j+=2) {
      |                 ~~~^~~~~~~~~~~
mushrooms.cpp:33:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |     for(int j=1;j+1<qry.size();j+=2) {
      |                 ~~~^~~~~~~~~~~
mushrooms.cpp:50:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |    if(w==qry.size()/2) {
      |       ~^~~~~~~~~~~~~~
mushrooms.cpp:51:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |     for(int j=1;j+1<qry.size();j+=2) {
      |                 ~~~^~~~~~~~~~~
mushrooms.cpp:55:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |     for(int j=1;j+1<qry.size();j+=2) {
      |                 ~~~^~~~~~~~~~~

• Subtask 1: 80.7143 / 100