Submission #899358

#	Time	Username	Problem	Language	Result	Execution time	Memory
899358		SuPythony	Arranging Shoes (IOI19_shoes)	C++17	50 / 100	1056 ms	3164 KiB

shoes

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

ll count_swaps(vector<int> S) {
    ll ans=0;
    for (int i=0; i<S.size(); i+=2) {
        ll val=S[i];
        auto f=find(S.begin()+i+1, S.end(), -val);
        ll k=f-S.begin()-i;
        if (S[i]<=0) ans+=(k-1);
        else ans+=k;
        S.erase(f);
        S.insert(S.begin()+i+1, 1);
    }
    return ans;
}

Compilation message (stderr)

shoes.cpp: In function 'll count_swaps(std::vector<int>)':
shoes.cpp:7:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    7 |     for (int i=0; i<S.size(); i+=2) {
      |                   ~^~~~~~~~~

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