Submission #259427

#TimeUsernameProblemLanguageResultExecution timeMemory
259427BenqSwap (BOI16_swap)C++14
0 / 100
1096 ms9728 KiB
#include <bits/stdc++.h> using namespace std; typedef long long ll; typedef long double ld; typedef double db; typedef string str; typedef pair<int,int> pi; typedef pair<ll,ll> pl; typedef pair<db,db> pd; typedef vector<int> vi; typedef vector<ll> vl; typedef vector<db> vd; typedef vector<str> vs; typedef vector<pi> vpi; typedef vector<pl> vpl; typedef vector<pd> vpd; #define mp make_pair #define f first #define s second #define sz(x) (int)(x).size() #define all(x) begin(x), end(x) #define rall(x) (x).rbegin(), (x).rend() #define rsz resize #define ins insert #define ft front() #define bk back() #define pf push_front #define pb push_back #define eb emplace_back #define lb lower_bound #define ub upper_bound #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) const int MOD = 1e9+7; // 998244353; const int MX = 2e5+5; const ll INF = 1e18; const ld PI = acos((ld)-1); const int xd[4] = {1,0,-1,0}, yd[4] = {0,1,0,-1}; mt19937 rng((uint32_t)chrono::steady_clock::now().time_since_epoch().count()); template<class T> bool ckmin(T& a, const T& b) { return b < a ? a = b, 1 : 0; } template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; } constexpr int pct(int x) { return __builtin_popcount(x); } constexpr int bits(int x) { return 31-__builtin_clz(x); } // floor(log2(x)) ll cdiv(ll a, ll b) { return a/b+((a^b)>0&&a%b); } // divide a by b rounded up ll fdiv(ll a, ll b) { return a/b-((a^b)<0&&a%b); } // divide a by b rounded down ll half(ll x) { return fdiv(x,2); } template<class T, class U> T fstTrue(T lo, T hi, U f) { // note: if (lo+hi)/2 is used instead of half(lo+hi) then this will loop infinitely when lo=hi hi ++; assert(lo <= hi); // assuming f is increasing while (lo < hi) { // find first index such that f is true T mid = half(lo+hi); f(mid) ? hi = mid : lo = mid+1; } return lo; } template<class T, class U> T lstTrue(T lo, T hi, U f) { lo --; assert(lo <= hi); // assuming f is decreasing while (lo < hi) { // find first index such that f is true T mid = half(lo+hi+1); f(mid) ? lo = mid : hi = mid-1; } return lo; } template<class T> void remDup(vector<T>& v) { sort(all(v)); v.erase(unique(all(v)),end(v)); } // INPUT template<class A> void re(complex<A>& c); template<class A, class B> void re(pair<A,B>& p); template<class A> void re(vector<A>& v); template<class A, size_t SZ> void re(array<A,SZ>& a); template<class T> void re(T& x) { cin >> x; } void re(db& d) { str t; re(t); d = stod(t); } void re(ld& d) { str t; re(t); d = stold(t); } template<class H, class... T> void re(H& h, T&... t) { re(h); re(t...); } template<class A> void re(complex<A>& c) { A a,b; re(a,b); c = {a,b}; } template<class A, class B> void re(pair<A,B>& p) { re(p.f,p.s); } template<class A> void re(vector<A>& x) { trav(a,x) re(a); } template<class A, size_t SZ> void re(array<A,SZ>& x) { trav(a,x) re(a); } // TO_STRING #define ts to_string str ts(char c) { return str(1,c); } str ts(const char* s) { return (str)s; } str ts(str s) { return s; } str ts(bool b) { #ifdef LOCAL return b ? "true" : "false"; #else return ts((int)b); #endif } template<class A> str ts(complex<A> c) { stringstream ss; ss << c; return ss.str(); } str ts(vector<bool> v) { str res = "{"; F0R(i,sz(v)) res += char('0'+v[i]); res += "}"; return res; } template<size_t SZ> str ts(bitset<SZ> b) { str res = ""; F0R(i,SZ) res += char('0'+b[i]); return res; } template<class A, class B> str ts(pair<A,B> p); template<class T> str ts(T v) { // containers with begin(), end() #ifdef LOCAL bool fst = 1; str res = "{"; for (const auto& x: v) { if (!fst) res += ", "; fst = 0; res += ts(x); } res += "}"; return res; #else bool fst = 1; str res = ""; for (const auto& x: v) { if (!fst) res += " "; fst = 0; res += ts(x); } return res; #endif } template<class A, class B> str ts(pair<A,B> p) { #ifdef LOCAL return "("+ts(p.f)+", "+ts(p.s)+")"; #else return ts(p.f)+" "+ts(p.s); #endif } // OUTPUT template<class A> void pr(A x) { cout << ts(x); } template<class H, class... T> void pr(const H& h, const T&... t) { pr(h); pr(t...); } void ps() { pr("\n"); } // print w/ spaces template<class H, class... T> void ps(const H& h, const T&... t) { pr(h); if (sizeof...(t)) pr(" "); ps(t...); } // DEBUG void DBG() { cerr << "]" << endl; } template<class H, class... T> void DBG(H h, T... t) { cerr << ts(h); if (sizeof...(t)) cerr << ", "; DBG(t...); } #ifdef LOCAL // compile with -DLOCAL, chk -> fake assert #define dbg(...) cerr << "Line(" << __LINE__ << ") -> [" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__) #define chk(...) if (!(__VA_ARGS__)) cerr << "Line(" << __LINE__ << ") -> function(" \ << __FUNCTION__ << ") -> CHK FAILED: (" << #__VA_ARGS__ << ")" << "\n", exit(0); #else #define dbg(...) 0 #define chk(...) 0 #endif // FILE I/O void setIn(str s) { freopen(s.c_str(),"r",stdin); } void setOut(str s) { freopen(s.c_str(),"w",stdout); } void unsyncIO() { ios_base::sync_with_stdio(0); cin.tie(0); } void setIO(str s = "") { unsyncIO(); // cin.exceptions(cin.failbit); // throws exception when do smth illegal // ex. try to read letter into int if (sz(s)) { setIn(s+".in"), setOut(s+".out"); } // for USACO } int n, p[MX]; int par[MX]; vi val[MX], child[MX]; int qmin(int x) { if (!par[x]) { assert(p[x]); return p[x]; } assert(p[x] == 0); x = par[x]; int res = MOD; while (x) { assert(sz(val[x])); trav(t,val[x]) ckmin(res,t); if (sz(val[x]) == 2) { assert(!par[x]); break; } else { assert(sz(val[x]) == 1 && par[x]); } } assert(res != MOD); return res; } void delChild(int a, int b) { assert(a && par[b] == a); auto it = find(all(child[a]),b); assert(it != end(child[a])); child[a].erase(it); par[b] = 0; } void setChild(int a, int b) { assert(a); child[a].pb(b); par[b] = a; assert(p[b]); p[b] = 0; } void setEq(int x) { if (p[x]) return; int v = qmin(x); vi trail = {x}; while (find(all(val[trail.bk]),v) == end(val[trail.bk])) trail.pb(par[trail.bk]); // dbg("SETEQ",x,trail); for (;sz(trail) > 1;trail.pop_back()) { int t = trail.bk; assert(sz(val[t]) && sz(child[t]) == 2); int c = trail[sz(trail)-2], C = child[t][0]+child[t][1]-c; val[c].pb(v); delChild(t,c); delChild(t,C); if (sz(val[t]) == 2) { val[C].pb(val[t][0]+val[t][1]-v); } else { int P = par[t]; delChild(P,t); setChild(P,C); } } } int main() { setIO(); re(n); FOR(i,1,n+1) re(p[i]); FOR(i,1,n+1) { if (!par[i] && sz(val[i])) { assert(sz(val[i]) == 1 && p[i] == 0); p[i] = val[i][0]; val[i] = {}; } // dbg("HUH",i,p[i],par[i]); int x = qmin(i); int mn = x; if (2*i <= n) ckmin(mn,p[2*i]); if (2*i+1 <= n) ckmin(mn,p[2*i+1]); if (mn == x) setEq(i); // just remove the min else if (mn == p[2*i]) { // don't touch p[2*i+1] if (!par[i]) p[2*i] = p[i]; else { int P = par[i]; delChild(P,i); setChild(P,2*i); } } else { if (!par[i]) val[i] = {p[i],p[2*i]}; else val[i] = {p[2*i]}; setChild(i,2*i), setChild(i,2*i+1); } pr(mn,' '); // FOR(z,1,n+1) dbg(z,p[z],par[z],child[z],val[z]); } // you should actually read the stuff at the bottom } /* stuff you should look for * int overflow, array bounds * special cases (n=1?) * do smth instead of nothing and stay organized * WRITE STUFF DOWN */

Compilation message (stderr)

swap.cpp: In function 'void setIn(str)':
swap.cpp:166:28: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
 void setIn(str s) { freopen(s.c_str(),"r",stdin); }
                     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
swap.cpp: In function 'void setOut(str)':
swap.cpp:167:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
 void setOut(str s) { freopen(s.c_str(),"w",stdout); }
                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
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