Submission #474303

#	Time	Username	Problem	Language	Result	Execution time	Memory
474303		Carmel_Ab1	Mountains (IOI17_mountains)	C++17	20 / 100	1081 ms	280 KiB

mountains

#include<bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>

//using namespace __gnu_pbds;
using namespace std;

typedef long double ld;
typedef long long ll;
typedef unsigned long long ull;
typedef vector<int> vi;
typedef vector<vector<int>> vvi;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef pair<int, int> pi;
typedef pair<ll, ll> pl;
typedef vector<pl> vpl;
typedef vector<ld> vld;
typedef pair<ld, ld> pld;

//typedef tree<ll, null_type, less_equal<ll>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;
template<typename T>
ostream &operator<<(ostream &os, vector<T> &a) {
    os << "[";
    for (int i = 0; i < ll(a.size()); i++) { os << a[i] << ((i != ll(a.size() - 1) ? " " : "")); }
    os << "]\n";
    return os;
}

#define all(x) x.begin(),x.end()
#define YES out("YES")
#define NO out("NO")
#define out(x){cout << x << "\n"; return;}
#define GLHF ios_base::sync_with_stdio(false); cin.tie(NULL)
#define print(x){for(auto ait:x) cout << ait << " "; cout << "\n";}
#define pb push_back
#define umap unordered_map

template<typename T1, typename T2>
istream &operator>>(istream &is, pair<T1, T2> &p) {
    is >> p.first >> p.second;
    return is;
}

template<typename T1, typename T2>
ostream &operator<<(ostream &os, pair<T1, T2> &p) {
    os << "" << p.first << " " << p.second << "";
    return os;
}

void usaco(string taskname) {
    string fin = taskname + ".in";
    string fout = taskname + ".out";
    const char *FIN = fin.c_str();
    const char *FOUT = fout.c_str();
    freopen(FIN, "r", stdin);
    freopen(FOUT, "w", stdout);
}

template<typename T>
void read(vector<T> &v) {
    int n = v.size();
    for (int i = 0; i < n; i++)
        cin >> v[i];
}

template<typename T>
vector<T> UNQ(vector<T> a) {
    vector<T> ans;
    for (T t: a)
        if (ans.empty() || t != ans.back())
            ans.push_back(t);
    return ans;
}

ll ceil(ll a, ll b) {
    ll ans = a / b;
    if (a % b)ans++;
    return ans;
}

ld log(ld a, ld b) { return log(b) / log(a); }

ll power(ll base, ll exp, ll M = 1e18) {//(base^exp)%M
    ll ans = 1;
    while (exp) {
        if (exp % 2 == 1)ans = ((ans % M) * (base % M)) % M;
        base = ((base % M) * (base % M)) % M;
        exp /= 2;
    }
    return ans;
}

string to_base(int n, int new_base) {
    string s;
    int nn = n;
    while (nn) {
        s += to_string(nn % new_base);
        nn /= new_base;
    }
    reverse(all(s));
    return s;
}

ll gcd(ll a, ll b) {
    if (a < b)swap(a, b);
    if (b == 0)return a;
    return gcd(b, a % b);
}

ll lcm(ll a, ll b) {
    ll x = (a / gcd(a, b));
    return b * x;
}

vl generate_array(ll n, ll mn = 1, ll mx = 1e18 + 1) {
    if (mx == 1e18 + 1)
        mx = n;
    vl ans(n);
    for (int i = 0; i < n; i++)
        ans[i] = (mn + rand() % (mx - mn + 1));
    return ans;
}

string substr(string s, int l, int r) {
    string ans;
    for (int i = l; i <= r; i++)
        ans += s[i];
    return ans;
}

#include "mountains.h"
//#include "grader.cpp"

vvi g;
vi col;

vector<bool>vis;
void dfs(int src){
    vis[src]=1;


    for(int nbr:g[src])
        if(!vis[nbr])
            dfs(nbr);

    map<int,bool>has;
    for(int nbr:g[src])
        has[col[nbr]]=1;

    for(int i=1; ; i++){
        if(!has[i]){
            col[src]=i;
            return;
        }
    }
}
int maximum_deevs(vi Y) {
    int n=Y.size();

    vl y(n);
    for(int i=0; i<n; i++)
        y[i]=ll(Y[i]);
    g.resize(n);
    vector<vector<bool>>has(n,vector<bool>(n));
    for(int i=0; i<n; i++){
        for(int j=i+1; j<n; j++){
            bool ok=1;
            for(int k=i+1; k<j; k++) {
                if ((y[k]-y[i])*(i-j)<(y[i]-y[j])*(k-i))
                    ok=0;
            }
            if(!ok)
                continue;
            g[i].pb(j),g[j].pb(i);
            has[i][j]=has[j][i]=1;
        }
    }

    int ans=0;
    for(ll i=0; i<(1ll<<n); i++){
        vi cur;
        for(ll j=0; j<n; j++)
            if(i&(1ll<<j))
                cur.pb(j);
        bool ok=1;
        for(int j1=0;ok && j1<cur.size(); j1++)
            for(int j2=j1+1;ok && j2<cur.size(); j2++)
                if(has[cur[j1]][cur[j2]])
                    ok=0;

        if(ok)
            ans=max(ans,__builtin_popcount(i));
    }
    return ans;
    col.resize(n);
    vis.resize(n);

    dfs(0);
    map<int,int>cnt;
    for(int i=0; i<n; i++){
        cnt[col[i]]++;
        ans=max(ans,cnt[col[i]]);
    }
    return ans;
}

Compilation message (stderr)

mountains.cpp: In function 'int maximum_deevs(vi)':
mountains.cpp:187:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  187 |         for(int j1=0;ok && j1<cur.size(); j1++)
      |                            ~~^~~~~~~~~~~
mountains.cpp:188:37: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  188 |             for(int j2=j1+1;ok && j2<cur.size(); j2++)
      |                                   ~~^~~~~~~~~~~
mountains.cpp: In function 'void usaco(std::string)':
mountains.cpp:56:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   56 |     freopen(FIN, "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~
mountains.cpp:57:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   57 |     freopen(FOUT, "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 0 / 20
• Subtask 3: 0 / 30
• Subtask 4: 0 / 30