Submission #315187

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
315187	2020-10-22 04:14:54	2qbingxuan	Cat (info1cup19_cat)	C++14	100 / 100	597 ms	13356 KiB

cat

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#include <bits/stdc++.h>
#ifdef local
#define debug(args...) ppbx(#args, args)
template <typename ...T> void ppbx(const char *s, T ...args) {
    int cnt = sizeof...(T);
    (std::cerr << "(" << s << ") = (" , ... , (std::cerr << args << (--cnt ? ", " : ")\n")));
}
#else
#define debug(...) ((void)0)
#endif // local
#define pb emplace_back
#define all(v) begin(v), end(v)
using namespace std;
using ll = long long;
void solve() {
    int n;
    cin >> n;
    vector<int> p(n);
    for(int i = 0; i < n; i++) cin >> p[i], --p[i];
    for(int i = 0; i < n; i++) if(p[i] + p[n-1-i] != n-1) return cout << -1 << '\n', void();
    vector<pair<int,int>> ans;
    int H = n/2;
    vector<int> pos(H);
    for(int i = 0; i < H; i++) pos[p[i] < H ? p[i] : n-1-p[i]] = i;
    vector<int> vis(H);
    int last = -1;
    auto go = [&](int a, int b) {
        swap(p[a], p[b]);
        swap(p[n-1-a], p[n-1-b]);
 
 
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Compilation message (stderr)

cat.cpp: In function 'void solve()':
cat.cpp:76:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   76 |     for(auto [a, b]: ans) cout << a+1 << ' ' << b+1 << '\n';
      |              ^

• Subtask 1: 15 / 15
• Subtask 2: 10 / 10
• Subtask 3: 25 / 25
• Subtask 4: 15 / 15
• Subtask 5: 35 / 35