제출 #245832

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
245832		LittleFlowers__	Simurgh (IOI17_simurgh)	C++17	13 / 100	211 ms	4856 KiB

simurgh

#include <bits/stdc++.h>
using namespace std;
#define in ({int x=0;int c=getchar(),n=0;for(;!isdigit(c);c=getchar()) n=(c=='-');for(;isdigit(c);c=getchar()) x=x*10+c-'0';n?-x:x;})
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int rnd(int l,int r){return l+rng()%(r-l+1);}
#define fasty ios_base::sync_with_stdio(0),cin.tie(0);
#define forinc(a,b,c) for(int a=b,_c=c;a<=_c;++a)
#define fordec(a,b,c) for(int a=b,_c=c;a>=_c;--a)
#define forv(a,b) for(auto&a:b)
#define fi first
#define se second
#define pb push_back
#define ii pair<int,int>
#define mt make_tuple
#define all(a) a.begin(),a.end()
#define reset(f, x) memset(f, x, sizeof(f))
#define gg exit(0);

#include "simurgh.h"

const int N=510;

int mode,it,asked=1;
int dd[N],fa[N],st[N],ed[N];
int id[N][N];
int asking[1000000];
int yes[1000000];
int no[1000000];
int tested[1000000];
vector<int> ask;
vector<int> ad[N];

void dfs(int u){
    st[u]=++it;
    dd[u]=1;
    forv(v,ad[u]){
        if(!dd[v]){
            if(mode && !asking[id[u][v]]) continue;
            if(!mode){
                ask.push_back(id[u][v]);
                asking[id[u][v]]=1;
            }
            fa[v]=u;
            dfs(v);
        }
    }
    ed[u]=it;
}

int anc(int u,int v){
    return st[u]<=st[v] && ed[u]>=ed[v];
}

vector<int> find_roads(int n,vector<int> u,vector<int> v){
    int m=u.size();
    forinc(i,0,m-1){
        ad[u[i]].pb(v[i]);
        ad[v[i]].pb(u[i]);
        id[u[i]][v[i]]=id[v[i]][u[i]]=i;
    }
    forinc(i,0,n-1){
        shuffle(all(ad[i]),rng);
    }
    dfs(0);
    int tmp=count_common_roads(ask);
    if(tmp==n-1) return ask;

    vector<int> pos;
    forinc(i,0,m-1) if(!asking[i])
        pos.push_back(i);

    mode=1;
    int tot=0;
    vector<int> eq;
    auto tim=[&](int i,int rep){
        if(no[i]) return 1;
        if(yes[rep]){
            if(tested[i])
                return 0;
            tested[i]=1;
        }
        int suc=0;
        if(yes[rep] || no[i]) suc=1;
        int j=0; while(ask[j]!=rep) j++;
        ask[j]=i;
        asked++;
        //if(asked>30000) gg
        int to=count_common_roads(ask);
        if(to>tmp){
            tmp=to;
            asking[rep]=0;
            no[rep]=yes[i]=asking[i]=1;
            tot++;
            reset(dd,0);
            dfs(it=0);
            return 1;
        }
        ask[j]=rep;
        if(to<tmp){
            no[i]=yes[rep]=1;
            return 1;
        }
        eq.push_back(rep);
        //if(no[rep]) cerr<<"W\n";
        if(no[rep]){
            yes[i]=0;
            no[i]=1;
        }
        //return 0;
        return no[rep];
        //return no[rep];
    };
    forv(i,pos){
        int x=u[i], y=v[i], found=0;
        while(!anc(x,y)){
            int rep=id[x][fa[x]];
            if(tim(i,rep)){
                found=1;
                break;
            }
            x=fa[x];
        }
        while(y!=x && !found){
            int rep=id[y][fa[y]];
            if(tim(i,rep)) break;
            y=fa[y];
        }
        forv(j,eq){
            no[j]=1;
            yes[j]=0;
        }
        eq.clear();
    }
    //cerr<<asked<<"\n";
    return ask;
}

컴파일 시 표준 에러 (stderr) 메시지

simurgh.cpp: In lambda function:
simurgh.cpp:82:13: warning: variable 'suc' set but not used [-Wunused-but-set-variable]
         int suc=0;
             ^~~

• Subtask 1: 13 / 13
• Subtask 2: 0 / 17
• Subtask 3: 0 / 21
• Subtask 4: 0 / 19
• Subtask 5: 0 / 30