Submission #269708

#	Time	Username	Problem	Language	Result	Execution time	Memory
269708		egekabas	Easter Eggs (info1cup17_eastereggs)	C++14	Compilation error	0 ms	0 KiB

eastereggs

#include <bits/stdc++.h>
#define all(x) (x).begin(), (x).end()
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<ll, ll> pll;
typedef pair<ull, ull> pull;
typedef pair<int, int> pii;
typedef pair<ld, ld> pld;
/*int query(vector < int > islands){
    for(auto u : islands)
        cout << u << ' ';
    cout << endl;
    int ret;
    cin >> ret;
    return ret;
}*/
vector<int> g[600];
int n, curn;
int ok[600];
int sz[600];
void calcsz(int v, int prt){
    sz[v] = 1;
    for(auto u : g[v]){
        if(u == prt || ok[u] == 0) continue;
        calcsz(u, v);
        sz[v] += sz[u];
    }
}
vector<int> curv, othv;
void get(int v, int prt, vector<int> &curv){
    curv.pb(v);
    for(auto u : g[v]){
        if(u == prt || ok[u] == 0) continue;
        get(u, v, curv);
    }
}
int dfs(int v, int prt){
    vector<pii> child;
    child.pb({-1, -1});
    for(auto u : g[v])
        if(ok[u])
            child.pb({sz[u], u});
    vector<bitset<600>> bs(child.size());
    bs[0][0] = 1;
    for(int i = 1; i < child.size(); ++i)
        bs[i] = (bs[i-1]|(bs[i-1]<<child[i].ff));
    int cur = -1;
    if(bs[child.size()-1][(curn+1)/2-1])
        cur = (curn+1)/2-1;
    else{
        for(auto u : g[v]){
            if(u == prt || ok[u] == 0) continue;
            int bef = sz[u];
            sz[u] = sz[v];
            sz[v] -= bef;
            
            if(dfs(u, v))
                return 1;
            sz[v] += bef;
            sz[u] = bef;
        }
        return 0;
    }
    curv.clear(); othv.clear();
    curv.pb(v);
    othv.pb(v);
    for(int i = child.size()-1; i >= 1; --i){
        if(cur-child[i].ff >= 0 && bs[i-1][cur-child[i].ff]){
            get(child[i].ss, v, curv);
            cur -= child[i].ff;
        }
        else
            get(child[i].ss, v, othv);
    }
    if(query(curv) == 0)
        swap(curv, othv);
    return 1;
}
int calc(vector<int> v){
    if(v.size() == 1) return v[0];
    if(v.size() == 2){
        if(query({v[0]}))
            return v[0];
        return v[1];
    }
    curn = v.size();
    for(int i = 1; i <= n; ++i)
        ok[i] = 0;
    for(auto u : v)
        ok[u] = 1;
    int root = v[0];
    calcsz(root, 0);
    dfs(root, 0);
    return calc(curv);
}

int findEgg(int N, vector<pair<int, int>> bridges){
    n = N;
    for(auto u : bridges){
        g[u.ff].pb(u.ss);
        g[u.ss].pb(u.ff);
    }
    vector<int> v;
    for(int i = 1; i <= n; ++i)
        v.pb(i);
    return calc(v);
}
/*int main(){
    cout << findEgg(5, {{1, 2}, {1, 3}, {2, 4}, {4, 5}}) << '\n';
}*/

Compilation message (stderr)

eastereggs.cpp: In function 'int dfs(int, int)':
eastereggs.cpp:51:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |     for(int i = 1; i < child.size(); ++i)
      |                    ~~^~~~~~~~~~~~~~
eastereggs.cpp:81:8: error: 'query' was not declared in this scope
   81 |     if(query(curv) == 0)
      |        ^~~~~
eastereggs.cpp: In function 'int calc(std::vector<int>)':
eastereggs.cpp:88:12: error: 'query' was not declared in this scope
   88 |         if(query({v[0]}))
      |            ^~~~~