Submission #476761

#	Time	Username	Problem	Language	Result	Execution time	Memory
476761		ponytail	Arranging Shoes (IOI19_shoes)	C++17	10 / 100	1095 ms	1860 KiB

shoes

#include <bits/stdc++.h>
using namespace std;
const int MAXN = 1e5 + 5;
typedef long long ll;
int n;
int inv(int x){
    if(x<0) return -x;
    else if(x>n) return x - n;
    else return x + n;
}
mt19937 rng((int)std::chrono::steady_clock::now().time_since_epoch().count());
ll count_swaps(vector<int> S) {
    int nxt = 0;
    int ans = 0;
    for(int i=0; i<S.size(); i++) {
        if(S[i] < 0) {
            for(int j=i-1; j>=nxt; j--) {
                swap(S[j], S[j+1]); ans++;
            }
            for(int j=nxt+1; j<S.size(); j++) {
                if(S[j] == -S[nxt]) {
                    for(int k=j-1; k>=nxt+1; k--) {
                        swap(S[k], S[k+1]); ans++;
                    }
                    break;
                }
            }
            nxt += 2;
        }
    }
    return ans;
}
void solve() {
    int n; 
    cin >> n;
    vector<int> v(2*n);
    for(int i=0; i<2*n; i++) cin >> v[i]; 
    cout << count_swaps(v) << "\n";
}

Compilation message (stderr)

shoes.cpp: In function 'll count_swaps(std::vector<int>)':
shoes.cpp:15:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |     for(int i=0; i<S.size(); i++) {
      |                  ~^~~~~~~~~
shoes.cpp:20:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |             for(int j=nxt+1; j<S.size(); j++) {
      |                              ~^~~~~~~~~

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