Submission #373606

#	Time	Username	Problem	Language	Result	Execution time	Memory
373606		teehandsome	Arranging Shoes (IOI19_shoes)	C++14	50 / 100	1098 ms	2028 KiB

shoes

#include "shoes.h"
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

#define endl '\n'
#define INF 1e9+7
#define all(x) x.begin(),x.end()

using namespace std;
using namespace __gnu_pbds;
using pii=pair<int,int>;
using ppi=pair<int,pii>;
using ll=long long;
using oset=tree<int,null_type,less<int>,rb_tree_tag,tree_order_statistics_node_update>;

void _print(vector<pii> x) {cerr<<"["; for(auto e:x) cerr<<"{"<<e.first<<","<<e.second<<"} ,"; cerr<<"]";}
template<typename T>
void _print(vector<T> x) {cerr<<"{"; for(auto e:x) cerr<<e<<","; cerr<<"}";}
void _print(pii x) {cerr<<"{"<<x.first<<","<<x.second<<"}";}
template<typename T>
void _print(T x) {cerr<<x;}
void dbg() {cerr<<endl;}
template<typename Head,typename... Tail>
void dbg(Head H,Tail... T) {
    _print(H);
    if(sizeof...(T)) cerr<<",";
    else cerr<<"]";
    dbg(T...);
}
#define debug(...) cerr<<"[\""<<#__VA_ARGS__<<"\"]: [",dbg(__VA_ARGS__);

long long count_swaps(std::vector<int> s) {
	int n=s.size();
	ll ans=0;
	bool sub4=true;
	for(int i=0;i<n;i++) {
        if(s[i]==-s[i+n] and s[i]<0) continue;
        sub4=false; break;
	}
	if(sub4) {
        for(int i=1;i<n;i++) ans+=i;
        return ans;
	}
	for(int i=0;i<n;i++) {
        if(s[i]==-s[i^1]) {
            if(i&1 and s[i]<0) ans++;
            continue;
        }
        int r;
        for(int j=i+1;j<n;j++) {
            if(s[j]==-s[i]) {
                r=j; break;
            }
        }
        while(r>i+1) {
            ans++; swap(s[r],s[r-1]); r--;
        }
        if(s[i]>0) swap(s[i],s[i+1]),ans++;
	}
	return ans;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:50:13: warning: 'r' may be used uninitialized in this function [-Wmaybe-uninitialized]
   50 |         int r;
      |             ^

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