제출 #210995

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
210995		2qbingxuan	Arranging Shoes (IOI19_shoes)	C++14	컴파일 에러	0 ms	0 KiB

shoes

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

using namespace std;

long long count_swaps(std::vector<int> s) {
    {
        int cnt = 0;
        vector<int> id(s.size());
        map<int,vector<int>> mp;
        for(int i = 0; i < n; i++) {
            mp[s[i]].push_back(i);
        }
        for(int i = 0; i < n; i++) {
            if(id[i]) continue;
            int S = abs(s[i]);
            int a = mp[S].front(), b = mp[-S].front();
            id[a] = ++cnt, id[b] = ++cnt;
            mp[S].pop_front(), mp[-S].pop_front();
        }
        s = id;
    }
    //for(int x: s) cout << x << ' '; cout << '\n';
    std::reverse(s.begin(), s.end());
    std::vector<int> BIT(s.size()+1);
    auto query = [&BIT](int p){
        int res = 0;
        for(; p>0; p-=p&-p) res += BIT[p];
        return res;
    };
    auto add = [&BIT](int p){
        for(; p<BIT.size(); p+=p&-p) ++BIT[p];
    };
    long long ans = 0;
    for(int x: s) ans += query(x-1), add(x);
    return ans;
}

컴파일 시 표준 에러 (stderr) 메시지

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:11:28: error: 'n' was not declared in this scope
         for(int i = 0; i < n; i++) {
                            ^
shoes.cpp:14:28: error: 'n' was not declared in this scope
         for(int i = 0; i < n; i++) {
                            ^
shoes.cpp:19:19: error: 'std::map<int, std::vector<int> >::mapped_type {aka class std::vector<int>}' has no member named 'pop_front'; did you mean 'front'?
             mp[S].pop_front(), mp[-S].pop_front();
                   ^~~~~~~~~
                   front
shoes.cpp:19:39: error: 'std::map<int, std::vector<int> >::mapped_type {aka class std::vector<int>}' has no member named 'pop_front'; did you mean 'front'?
             mp[S].pop_front(), mp[-S].pop_front();
                                       ^~~~~~~~~
                                       front
shoes.cpp: In lambda function:
shoes.cpp:32:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(; p<BIT.size(); p+=p&-p) ++BIT[p];
               ~^~~~~~~~~~~