제출 #328446

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
328446		MarcoMeijer	Love Polygon (BOI18_polygon)	C++14	29 / 100	298 ms	60140 KiB

polygon

#include <bits/stdc++.h>
using namespace std;
 
// macros
typedef long long ll;
typedef long double ld;
typedef pair<int, int> ii;
typedef pair<ll, ll> lll;
typedef tuple<int, int, int> iii;
typedef vector<int> vi;
typedef vector<ii> vii;
typedef vector<iii> viii;
typedef vector<ll> vll;
typedef vector<lll> vlll;
#define REP(a,b,c) for(int a=int(b); a<int(c); a++)
#define RE(a,c) REP(a,0,c)
#define RE1(a,c) REP(a,1,c+1)
#define REI(a,b,c) REP(a,b,c+1)
#define REV(a,b,c) for(int a=int(c-1); a>=int(b); a--)
#define FOR(a,b) for(auto& a : b)
#define all(a) a.begin(), a.end()
#define INF 1e18
#define EPS 1e-9
#define pb push_back
#define popb pop_back
#define fi first
#define se second
#define sz size()
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
 
// input
template<class T> void IN(T& x) {cin >> x;}
template<class H, class... T> void IN(H& h, T&... t) {IN(h); IN(t...); }
 
// output
template<class T1, class T2> void OUT(const pair<T1,T2>& x);
template<class T> void OUT(const vector<T>& x);
template<class T> void OUT(const T& x) {cout << x;}
template<class H, class... T> void OUT(const H& h, const T&... t) {OUT(h); OUT(t...); }
template<class T1, class T2> void OUT(const pair<T1,T2>& x) {OUT(x.fi,' ',x.se);}
template<class T> void OUT(const vector<T>& x) {RE(i,x.size()) OUT(i==0?"":" ",x[i]);}
template<class... T> void OUTL(const T&... t) {OUT(t..., "\n"); }
template<class H> void OUTLS(const H& h) {OUTL(h); }
template<class H, class... T> void OUTLS(const H& h, const T&... t) {OUT(h,' '); OUTLS(t...); }
 
//===================//
//  Added libraries  //
//===================//
 
//===================//
//end added libraries//
//===================//
 
void program();
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    program();
}
 
 
//===================//
//   begin program   //
//===================//
 
const int MX = 5e5;

int n;
string t[MX];
map<string,int> mp;
int nxt[MX];
int in[MX];
set<int> pre[MX];

void program() {
    IN(n);
    RE(i,n) {
        string s; IN(s,t[i]);
        mp[s] = i;
    }
    if(n%2) {
        OUTL(-1);
        return;
    }
    RE(i,n) nxt[i] = mp[t[i]];
    RE(i,n) in[nxt[i]]++;
    RE(i,n) pre[nxt[i]].insert(i);

    queue<int> q;
    RE(i,n) if(in[i]==0) q.push(i);
    
    set<int> nRem;
    RE(i,n) nRem.insert(i);
    int remove = 0;
    int ans = 0;
    while(!nRem.empty()) {
        int u=0;
        if(!q.empty()) {
            u = q.front(), q.pop();
        } else {
            u = *nRem.begin();
        }
        int v=nxt[u];
        nRem.erase(u);
        if(!nRem.count(v)){
            ans++;
            continue;
        }
        nRem.erase(v);
        if(nxt[v] == u) continue;
        ans++;
        in[nxt[v]]--;
        if(in[nxt[v]] == 0) q.push(nxt[v]);
    }
    OUTL(ans);
}

컴파일 시 표준 에러 (stderr) 메시지

polygon.cpp: In function 'void program()':
polygon.cpp:95:9: warning: unused variable 'remove' [-Wunused-variable]
   95 |     int remove = 0;
      |         ^~~~~~

• Subtask 1: 0 / 21
• Subtask 2: 0 / 25
• Subtask 3: 29 / 29
• Subtask 4: 0 / 25