Submission #1040916

#	Time	Username	Problem	Language	Result	Execution time	Memory
1040916		idas	Arranging Shoes (IOI19_shoes)	C++17	10 / 100	1100 ms	6720 KiB

shoes

#include <bits/stdc++.h>
#define FOR(i, begin, end) for(int i=(begin); i<(end); i++)
#define pb push_back

using namespace std;
typedef long long ll;
typedef vector<int> vi;

const int N=2e5+10;
int n, cn[N], pos[N];
vi p_pos, n_pos[N];

long long count_swaps(vector<int> s) {
    n=s.size();

    ll ans=0;
    for(int i=n-1; i>=0; i--){
        int src;
        if(i&1){
            int in;
            for(int j=i; j>=0; j--){
                if(s[j]>0){
                    src=s[j];
                    in=j;
                    break;
                }
            }

            for(int j=in+1; j<=i; j++){
                swap(s[j-1], s[j]);
                ans++;
            }
        }
        else{
            int in;
            for(int j=i; j>=0; j--){
                if(s[j]==-src){
                    in=j;
                    break;
                }
            }

            for(int j=in+1; j<=i; j++){
                swap(s[j-1], s[j]);
                ans++;
            }
        }
    }

    return ans;
}

Compilation message (stderr)

shoes.cpp: In function 'long long int count_swaps(std::vector<int>)':
shoes.cpp:43:21: warning: 'in' may be used uninitialized in this function [-Wmaybe-uninitialized]
   43 |             for(int j=in+1; j<=i; j++){
      |                     ^
shoes.cpp:29:21: warning: 'in' may be used uninitialized in this function [-Wmaybe-uninitialized]
   29 |             for(int j=in+1; j<=i; j++){
      |                     ^
shoes.cpp:37:26: warning: 'src' may be used uninitialized in this function [-Wmaybe-uninitialized]
   37 |                 if(s[j]==-src){
      |                          ^~~~

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