Submission #393935

#TimeUsernameProblemLanguageResultExecution timeMemory
393935arwaeystoamnegSorting (IOI15_sorting)C++17
100 / 100
445 ms44036 KiB
// EXPLOSION! #define _CRT_SECURE_NO_WARNINGS #include<bits/stdc++.h> #include<unordered_set> #include<unordered_map> #include<chrono> using namespace std; typedef pair<int, int> pii; typedef long long ll; typedef pair<ll, ll> pll; typedef long double ld; typedef vector<int> vi; typedef vector<ll> vll; typedef vector<pair<int, int>> vpi; typedef vector<pair<ll, ll>> vpll; #define FOR(i,a,b) for (int i = (a); i < (b); ++i) #define F0R(i,a) FOR(i,0,a) #define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i) #define R0F(i,a) ROF(i,0,a) #define trav(a,x) for (auto& a: x) #define pb push_back #define mp make_pair #define rsz resize #define sz(x) int(x.size()) #define all(x) x.begin(),x.end() #define f first #define s second #define cont continue #define endl '\n' //#define ednl '\n' #define test int testc;cin>>testc;while(testc--) #define pr(a, b) trav(x,a)cerr << x << b; cerr << endl; #define message cout << "Hello World" << endl; const int dx[4] = { 1,0,-1,0 }, dy[4] = { 0,1,0,-1 }; // for every grid problem!! const ll linf = 4000000000000000000LL; const ll inf = 1000000007;//998244353 void pv(vi a) { trav(x, a)cout << x << " "; cout << endl; }void pv(vll a) { trav(x, a)cout << x << " "; cout << endl; }void pv(vector<vi>a) { F0R(i, sz(a)) { cout << i << endl; pv(a[i]); cout << endl; } }void pv(vector<vll>a) { F0R(i, sz(a)) { cout << i << endl; pv(a[i]); }cout << endl; }void pv(vector<string>a) { trav(x, a)cout << x << endl; cout << endl; } void setIO(string s) { ios_base::sync_with_stdio(0); cin.tie(0); #ifdef arwaeystoamneg if (sz(s)) { freopen((s + ".in").c_str(), "r", stdin); if (s != "test1") freopen((s + ".out").c_str(), "w", stdout); } #endif } #ifndef arwaeystoamneg #include "sorting.h" #endif const int MAX = 200005; int n, m, a[MAX], x[3 * MAX], y[3 * MAX], ne[MAX], v[MAX], temp[MAX]; vpi tempo; vpi ans; void dfs(int i) { if (v[i])return; v[i] = 1; tempo.pb({ ne[i],i }); dfs(ne[i]); } bool check() { F0R(i, m)swap(a[x[i]], a[y[i]]); F0R(i, n)ne[a[i]] = i; fill(v, v + n, 0); int c = 0; F0R(i, n) { if (!v[i]) { tempo.clear(); c++, dfs(i); tempo.pop_back(); reverse(all(tempo)); trav(chess, tempo)ans.pb(chess); } } if (n - c > m)return 0; while (sz(ans) < m)ans.pb({ 0,0 }); R0F(i, m)swap(a[x[i]], a[y[i]]); F0R(i, n)temp[a[i]] = i; vpi t; F0R(i, m) { swap(temp[a[x[i]]], temp[a[y[i]]]); swap(a[x[i]], a[y[i]]); int j = temp[ans[i].f], k = temp[ans[i].s]; t.pb({ j,k }); swap(temp[a[j]], temp[a[k]]); swap(a[j], a[k]); } ans = t; return 1; } int findSwapPairs(int N, int S[], int M, int X[], int Y[], int P[], int Q[]) { n = N; int l = 0, r = M; F0R(i, min(3 * MAX, M))x[i] = X[i], y[i] = Y[i]; while (l < r) { m = (l + r) / 2; F0R(i, n)a[i] = S[i]; if (check())r = m; else l = m + 1; ans.clear(); } m = l; F0R(i, n)a[i] = S[i]; check(); F0R(i, sz(ans))P[i] = ans[i].f, Q[i] = ans[i].s; return l; } #ifdef arwaeystoamneg int main() { setIO(""); int N, M; cin >> N; int* S = (int*)malloc(sizeof(int) * (unsigned int)N); for (int i = 0; i < N; ++i) cin>>S[i]; cin >> M; int* X = (int*)malloc(sizeof(int) * (unsigned int)M), * Y = (int*)malloc(sizeof(int) * (unsigned int)M); for (int i = 0; i < M; ++i) { cin >> X[i] >> Y[i]; } int* P = (int*)malloc(sizeof(int) * (unsigned int)M), * Q = (int*)malloc(sizeof(int) * (unsigned int)M); int ans = findSwapPairs(N, S, M, X, Y, P, Q); cout << ans << endl; for (int i = 0; i < ans; ++i) cout << P[i] << " " << Q[i] << endl; F0R(i, ans) { swap(S[X[i]], S[Y[i]]); swap(S[P[i]], S[Q[i]]); } F0R(i, n)cout << S[i] << " "; return 0; } #endif

Compilation message (stderr)

sorting.cpp: In function 'void setIO(std::string)':
sorting.cpp:30:11: warning: unused parameter 'second' [-Wunused-parameter]
   30 | #define s second
      |           ^
sorting.cpp:44:19: note: in expansion of macro 's'
   44 | void setIO(string s) {
      |                   ^
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