Submission #577952

#	Time	Username	Problem	Language	Result	Execution time	Memory
577952		perchuts	Mountains (IOI17_mountains)	C++17	0 / 100	1 ms	308 KiB

mountains

#include <bits/stdc++.h>
#define all(x) x.begin(), x.end()
#define sz(x) (int) x.size()
#define endl '\n'
#define pb push_back
#define _ ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);

using namespace std;

using ll = long long;
using ull = unsigned long long;
using ii = pair<int,int>;
using iii = tuple<int,int,int>;

const int inf = 2e9+1;
const int mod = 1e9+7;
const int maxn = 1e5+100;

template<typename X, typename Y> bool ckmin(X& x, const Y& y) { return (y < x) ? (x=y,1):0; }
template<typename X, typename Y> bool ckmax(X& x, const Y& y) { return (x < y) ? (x=y,1):0; }

int dp[2001][2001], y[2001];
bool pode[2001][2001];

int solve(int l,int r){//dp[l][r] => as pontas sao (l,r).
    if(pode[l][r]==0)return 0;
    if(dp[l][r])return dp[l][r];
    int best = 2;
    for(int k=l+1;k<=r-1;++k){
        if(max({y[l],y[r],y[k]})==y[k]&&pode[l][k]&&pode[k][r]&&pode[l][r])ckmax(best,solve(l,k)+solve(k,r)-1);
    }
    return dp[l][r] = best;
}

int maximum_deevs(vector<int>v){
    int n = sz(v);
    for(int i=0;i<n;++i){
        y[i+1] = v[i];
        ll bx = 0, by = 0;
        for(int j=i+1;j<n;++j){
            if(bx*ll(v[j]-v[i])<by*ll(j-i))pode[i+1][j+1] = pode[j+1][i+1] = 1;
            else bx = ll(j-i), by = ll(v[j]-v[i]);
        }
    }
    ll ans = 1;//posso conseguir pegar so 1
    for(int l=1;l<=n;++l){
        for(int r=l;r<=n;++r){
            ckmax(ans,solve(l,r));
        }
    }
    // for(int i=1;i<=n;++i)for(int j=1;j<=n;++j)cout<<pode[i][j]<<" \n"[j==n];
    return ans;
}

// int main(){
//     int n;cin>>n;
//     vector<int>v(n);
//     for(auto&x :v)cin>>x;
//     cout<<maximum_deevs(v)<<endl;
// }

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