답안 #729179

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
729179 2023-04-23T15:18:18 Z Huseyn123 Logičari (COCI21_logicari) C++14
10 / 110
176 ms 30100 KB
#include <bits/stdc++.h>
#define MAX 300001
#define INF LLONG_MAX
#define MOD 1000000007
#define mp make_pair
#define mt make_tuple
#define pb push_back
#define ins insert
#define ff first
#define ss second
#define gett(x,m) get<m>(x)
#define all(a) a.begin(),a.end()
#define lb(a,b) lower_bound(all(a),b)
#define ub(a,b) upper_bound(all(a),b)
#define sortv(a) sort(all(a))
#define sorta(a,sz) sort(a,a+sz)
#define inputar(a,b){\
    for(int i=0;i<b;i++){\
        cin >> a[i];\
    }\
}
#define inputvec(a,b){\
    for(int i=0;i<b;i++){\
        ll num;\
        cin >> num;\
        a.pb(num);\
    }\
}
#define outputar(a,b){\
    for(int i=0;i<b;i++){\
        cout << a[i] << " ";\
    }\
    cout << "\n";\
}
#define outputvec(a){\
    for(auto x:a){\
        cout << x << " ";\
    }\
    cout << "\n";\
}
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef tuple<ll,ll,ll> tll;
typedef pair<ll,ll> pll;
typedef double db;
typedef long double ldb;
inline void USACO(string filename){
  freopen((filename+".in").c_str(),"r",stdin);
  freopen((filename+".out").c_str(),"w",stdout);
}
ll n,q,t=1,m,n2,m2,k,cnt=0,a[MAX],b[MAX],d[MAX],d2[MAX],x,y,z,x2,y2,z2,res1=0,cnt1,cnt2,cnt3;
ll c[1001][1001];
ll c2[1001][1001];
ll fact[MAX];
ll inv_fact[MAX];
//char c;
string str[MAX];
string s1,s2;
const int mod = 998244353;
ll modmul(ll x,ll y,ll md){
    if(y==1){
        return x;
    }
    if(y%2){
        return (x+modmul(x,y-1,md))%md;
    }
    else{
        return (modmul((x+x)%md,y/2,md))%md;
    }
}
ll powmod(ll x,ll y,ll md){
    x%=md;
    if(x==0){
        return 0;
    }
    ll res=1;
    while(y){
        if(y%2==1){
            res*=x;
            res%=md;
        }
        x*=x;
        x%=md;
        y/=2;
    }
    return res;
}
ll pow2(ll x,ll y){
    if(x==0){
        return 0;
    }
    ll res=1;
    while(y>0){
        if(y%2==1){
            if(res>=1e18/x){
                res=1e18;
            }
            else{
                res*=x;
            }
        }
        if(x>=1e18/x){
            x=1e18;
        }
        else{
            x*=x;
        }
        y/=2;
    }
    return res;
}
ll inv(ll n,ll md){
    return powmod(n,md-2,md);
}
ll nCkm(ll n,ll k,ll md){
    if(n-k<0){
        return 0;
    }
    return fact[n]*inv_fact[k]%md*inv_fact[n-k]%md;
}
ll nCk(ll x,ll y){
    if(x<y){
        return 0;
    }
    ll res=1;
    if(y>x-y){
        for(int i=y+1;i<=x;i++){
            res*=i;
        }
        for(int i=2;i<=x-y;i++){
            res/=i;
        }
    }
    else{
        for(int i=x-y+1;i<=x;i++){
            res*=i;
        }
        for(int i=2;i<=y;i++){
            res/=i;
        }
    }
    return res;
}
ll countbits(ll x){
    ll cnt=0;
    while(x){
        cnt+=x&1;
        x>>=1;
    }
    return cnt;
}
ll gcd(ll x,ll y){
    if(y==0){
        return x;
    }
    return gcd(y,x%y);
}
ll lcm(ll x,ll y){
    return x*y/gcd(x,y);
}
bool alpha(char c1,char c2){
    ll h1,h2;
    if(c1>='a'){
        h1=c1-'a';
    }
    else{
        h1=c1-'A';
    }
    if(c2>='a'){
        h2=c2-'a';
    }
    else{
        h2=c2-'A';
    }
    if(h1==h2){
        return c1<c2;
    }
    else{
        return h1<h2;
    }
}
ll dx[4]={1,0,0,-1};
ll dy[4]={0,1,-1,0};
struct custom_hash {
   static uint64_t splitmix64(uint64_t x) {
        x += 0x9e3779b97f4a7c15;
        x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
        x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
        return x ^ (x >> 31);
    }

    size_t operator()(uint64_t x) const {
        static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
        return splitmix64(x + FIXED_RANDOM);
    }
};
struct data{
    ll dt[2][2];
};
data f(data x,data y){
    data res;
    res.dt[0][0]=res.dt[0][1]=res.dt[1][0]=res.dt[1][1]=INF;
    for(int i=0;i<2;i++){
        for(int j=0;j<2;j++){
            ll h=x.dt[i][0];
            if(y.dt[1][j]<=INF-h){
                h+=y.dt[1][j];
            }
            else{
                h=INF;
            }
            res.dt[i][j]=min(res.dt[i][j],h);
            h=x.dt[i][1];
            if(y.dt[0][j]<=INF-h){
                h+=y.dt[0][j];
            }
            else{
                h=INF;
            }
            res.dt[i][j]=min(res.dt[i][j],h);
            h=x.dt[i][1];
            if(y.dt[1][j]<=INF-h){
                h+=y.dt[1][j];
            }
            else{
                h=INF;
            }
            res.dt[i][j]=min(res.dt[i][j],h);
        }
    }
    return res;
}
struct segtree{
    int size;
    vector<data> dp;
    void build(vector<ll> &a,int x,int lx,int rx){
        if(rx-lx==1){
            if(lx<(int)a.size()){
                dp[x].dt[1][1]=a[lx];
                dp[x].dt[0][0]=0;
            }
            return;
        }
        int m=(lx+rx)/2;
        build(a,2*x+1,lx,m);
        build(a,2*x+2,m,rx);
        dp[x]=f(dp[2*x+1],dp[2*x+2]);
    }
    void build(vector<ll> &a){
        build(a,0,0,size);
    }
    void init(int n){
        size=1;
        while(size<n){
            size*=2;
        }
        data h;
        h.dt[0][1]=h.dt[1][0]=INF;
        h.dt[0][0]=h.dt[1][1]=INF;
        dp.assign(2*size,h);
    }
    data get_res(int l,int r,int x,int lx,int rx){
        if(lx>=r || rx<=l){
            data h;
            h.dt[0][1]=h.dt[1][0]=0;
            h.dt[0][0]=h.dt[1][1]=INF;
            return h;
        }
        if(lx>=l && rx<=r){
            //cout << lx << " " << rx << " " << dp[x].dt[0][0] << " " << dp[x].dt[0][1] << " " << dp[x].dt[1][0] << " " << dp[x].dt[1][1]  << "\n";
            return dp[x];
        }
        data s1,s2;
        int m=(lx+rx)/2;
        s1=get_res(l,r,2*x+1,lx,m);
        s2=get_res(l,r,2*x+2,m,rx);
        data h=f(s1,s2);
        //cout << lx << " " << rx << " " << h.dt[0][0] << " " << h.dt[0][1]  << " " << h.dt[1][0] << " " << h.dt[1][1] << "\n";
        return f(s1,s2);
    }
    data get_res(int l,int r){
        return get_res(l,r,0,0,size);
    }
    void set(int i,int v,int x,int lx,int rx){
        if(rx-lx==1){
            dp[x].dt[1][1]=v;
            dp[x].dt[0][0]=0;
            return;
        }
        int m=(lx+rx)/2;
        if(i<m){
            set(i,v,2*x+1,lx,m);
        }
        else{
            set(i,v,2*x+2,m,rx);
        }
        dp[x]=f(dp[2*x+1],dp[2*x+2]);
        //cout << lx << " " << rx << " " << dp[x].dt[0][0] << " " << dp[x].dt[0][1] << " " << dp[x].dt[1][0] << " " << dp[x].dt[1][1]  << "\n";
    }
    void set(int i,int v){
        set(i,v,0,0,size);
    }
};
struct dsu{
    vector<ll> e;
    void init(int n){
        e.resize(n+1,-1);
    }
    int get(int x){
        if(e[x]<0){
            return x;
        }
        else{
            return e[x]=get(e[x]);
        }
    }
    int size(int x){
        return -e[get(x)];
    }
    bool same_set(int x,int y){
        return (get(x)==get(y));
    }
    bool unite(int x,int y){
        x=get(x);
        y=get(y);
        if(x==y){
            return false;
        }
        if(e[x]>e[y]){
            swap(x,y);
        }
        e[x]+=e[y];
        e[y]=x;
        return true;
    }
};
vector<vector<ll>> g;
vector<ll> used;
pll p;
void dfs(ll v){
    used[v]=1;
    for(auto x:g[v]){
        if(used[x]==0){
            dfs(x);
        }
        else{
            p=mp(x,v);
        }
    }
}
ll dp[2][2][MAX];
void dfs2(ll v,ll prev){
    dp[0][0][v]=0;
    dp[0][1][v]=1;
    dp[1][0][v]=0;
    dp[1][1][v]=1;
    if(v==p.ss){
        dp[0][0][v]=INF;
        dp[1][0][v]=INF;
    }
    ll cnt=0;
    for(auto x:g[v]){
        if(x==prev){
            continue;
        }
        dfs2(x,v);
        for(int i=0;i<2;i++){
            for(int j=0;j<2;j++){
                if(dp[i][j][v]>INF-dp[1-j][i][x]){
                    dp[i][j][v]=INF;
                }
                else{
                    dp[i][j][v]+=dp[1-j][i][x];
                }
            }
        }
        cnt++;
    }
    if(cnt==0){
        dp[1][0][v]=INF;
        dp[1][1][v]=INF;
    }
}
void dfs3(ll v,ll prev){
    dp[0][0][v]=0;
    dp[0][1][v]=1;
    dp[1][0][v]=0;
    dp[1][1][v]=1;
    if(v==p.ss){
        dp[0][1][v]=INF;
        dp[1][1][v]=INF;
    }
    ll cnt=0;
    for(auto x:g[v]){
        if(x==prev){
            continue;
        }
        dfs3(x,v);
        for(int i=0;i<2;i++){
            for(int j=0;j<2;j++){
                if(dp[i][j][v]>INF-dp[1-j][i][x]){
                    dp[i][j][v]=INF;
                }
                else{
                    dp[i][j][v]+=dp[1-j][i][x];
                }
            }
        }
        cnt++;
    }
    if(cnt==0){
        dp[1][0][v]=INF;
        dp[1][1][v]=INF;
    }
}
void dfs4(ll v,ll prev){
    dp[0][0][v]=0;
    dp[0][1][v]=1;
    dp[1][0][v]=0;
    dp[1][1][v]=1;
    if(v==p.ss){
        dp[0][0][v]=INF;
        dp[1][0][v]=INF;
        dp[1][1][v]=INF;
    }
    ll cnt=0;
    for(auto x:g[v]){
        if(x==prev){
            continue;
        }
        if(x==p.ss){
            dp[0][1][v]=INF;
            dp[1][1][v]=INF;
        }
        dfs4(x,v);
        for(int i=0;i<2;i++){
            for(int j=0;j<2;j++){
                if(dp[i][j][v]>INF-dp[1-j][i][x]){
                    dp[i][j][v]=INF;
                }
                else{
                    dp[i][j][v]+=dp[1-j][i][x];
                }
            }
        }
        cnt++;
    }
    if(cnt==0){
        dp[1][0][v]=INF;
        dp[1][1][v]=INF;
    }
}
void dfs5(ll v,ll prev){
    dp[0][0][v]=0;
    dp[0][1][v]=1;
    dp[1][0][v]=0;
    dp[1][1][v]=1;
    if(v==p.ss){
        dp[0][1][v]=INF;
        dp[1][1][v]=INF;
        dp[1][0][v]=INF;
    }
    ll cnt=0;
    for(auto x:g[v]){
        if(x==prev){
            continue;
        }
        if(x==p.ss){
            dp[0][1][v]=INF;
            dp[1][1][v]=INF;
        }
        dfs5(x,v);
        for(int i=0;i<2;i++){
            for(int j=0;j<2;j++){
                if(dp[i][j][v]>INF-dp[1-j][i][x]){
                    dp[i][j][v]=INF;
                }
                else{
                    dp[i][j][v]+=dp[1-j][i][x];
                }
            }
        }
        cnt++;
    }
    if(cnt==0){
        dp[1][0][v]=INF;
        dp[1][1][v]=INF;
    }
}
void solve(){
    cin >> n;
    g.resize(n+1);
    used.resize(n+1,0);
    for(int i=0;i<n;i++){
        cin >> x >> y;
        g[x].pb(y);
        g[y].pb(x);
    }
    ll res=INF;
    dfs(1);
    auto it=g[p.ff].begin();
    while(*it!=p.ss){
        ++it;
    }
    auto it1=g[p.ss].begin();
    while(*it1!=p.ff){
        ++it1;
    }
    g[p.ff].erase(it);
    g[p.ss].erase(it1);
    used.clear();
    used.resize(n+1,0);
    dfs2(p.ff,-1);
    res=min(res,dp[0][0][p.ff]);
    used.clear();
    used.resize(n+1,0);
    dfs3(p.ff,-1);
    res=min(res,dp[1][0][p.ff]);
    used.clear();
    used.resize(n+1,0);
    dfs4(p.ff,-1);
    res=min(res,dp[0][1][p.ff]);
    used.clear();
    used.resize(n+1,0);
    dfs5(p.ff,-1);
    res=min(res,dp[1][1][p.ff]);
    used.clear();
    used.resize(n+1,0);
    if(res==INF){
        cout << -1 << "\n";
    }
    else{
        cout << res << "\n";
    }
}
int main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    //USACO("poetry");
    //freopen("input.txt","r",stdin);
    //cin >> t;
    ll cnt1=1;
    while(t--){
        solve();
        cnt1++;
    }
}
/*
freopen("input.txt","r",stdin);
freopen("output.txt","w",stdout);
ifstream fin("template.in");
ofstream fout("template.out");
*/
/*
freopen("input.txt","r",stdin);
freopen("output.txt","w",stdout);
ifstream fin("template.in");
ofstream fout("template.out");
*/
/*
ll b[51][51];
b[0][0] = 1;
    for (int n = 1; n <= 50; ++n){
        b[n][0] = b[n][n] = 1;
        for (int k = 1; k < n; ++k)
            b[n][k] = b[n - 1][k - 1] + b[n - 1][k];
    }
*/

Compilation message

Main.cpp: In member function 'data segtree::get_res(int, int, int, int, int)':
Main.cpp:278:14: warning: variable 'h' set but not used [-Wunused-but-set-variable]
  278 |         data h=f(s1,s2);
      |              ^
# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 9684 KB Output is correct
2 Correct 6 ms 9684 KB Output is correct
3 Correct 5 ms 9684 KB Output is correct
4 Correct 5 ms 9684 KB Output is correct
5 Correct 153 ms 30064 KB Output is correct
6 Correct 157 ms 30096 KB Output is correct
7 Correct 161 ms 30100 KB Output is correct
8 Correct 176 ms 30096 KB Output is correct
# 결과 실행 시간 메모리 Grader output
1 Incorrect 6 ms 9684 KB Output isn't correct
2 Halted 0 ms 0 KB -
# 결과 실행 시간 메모리 Grader output
1 Incorrect 6 ms 9684 KB Output isn't correct
2 Halted 0 ms 0 KB -
# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 9684 KB Output is correct
2 Correct 6 ms 9684 KB Output is correct
3 Correct 5 ms 9684 KB Output is correct
4 Correct 5 ms 9684 KB Output is correct
5 Correct 153 ms 30064 KB Output is correct
6 Correct 157 ms 30096 KB Output is correct
7 Correct 161 ms 30100 KB Output is correct
8 Correct 176 ms 30096 KB Output is correct
9 Incorrect 6 ms 9684 KB Output isn't correct
10 Halted 0 ms 0 KB -