Submission #849115

#	Time	Username	Problem	Language	Result	Execution time	Memory
849115		abcvuitunggio	Arranging Shoes (IOI19_shoes)	C++17	45 / 100	26 ms	10896 KiB

shoes

#include "shoes.h"
#include <bits/stdc++.h>
using namespace std;
int a[200001],cnt=1;
long long res,f[200001];
vector <int> pos[100001];
long long count_swaps(vector <int> s){
    for (int i=s.size()-1;i>=0;i--)
        if (s[i]>0)
            pos[s[i]].push_back(i);
    for (int i=0;i<s.size();i++)
        if (s[i]<0){
            a[i]=cnt;
            a[pos[-s[i]].back()]=cnt+1;
            pos[-s[i]].pop_back();
            cnt+=2;
        }
    for (int i=s.size()-1;i>=0;i--){
        for (int j=a[i];j;j-=j&(-j))
            res+=f[j];
        for (int j=a[i];j<=s.size();j+=j&(-j))
            f[j]++;
    }
    return res;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:11:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   11 |     for (int i=0;i<s.size();i++)
      |                  ~^~~~~~~~~
shoes.cpp:21:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |         for (int j=a[i];j<=s.size();j+=j&(-j))
      |                         ~^~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 20
• Subtask 3: 20 / 20
• Subtask 4: 15 / 15
• Subtask 5: 0 / 20
• Subtask 6: 0 / 15