Submission #692313

#TimeUsernameProblemLanguageResultExecution timeMemory
692313saayan007Mountains (IOI17_mountains)C++17
0 / 100
1 ms212 KiB
#include "mountains.h" #include <bits/stdc++.h> using namespace std; using ll = long long; using pi = pair<int, int>; using pl = pair<long long, long long>; using vi = vector<int>; using vl = vector<long long>; using vpi = vector<pair<int, int>>; using vpl = vector<pair<long long, long long>>; #define fur(i, a, b) for(ll i = a; i <= (ll)b; ++i) #define ruf(i, a, b) for(ll i = a; i >= (ll)b; --i) #define fr first #define sc second #define mp make_pair #define pb emplace_back #define nl "\n" #define all(x) (x).begin(),(x).end() #define rall(x) (x).rbegin(),(x).rend() bool check(vector<int> &y, int i, int j, int k) { int A = y[i] - y[j]; int B = i - j; int C = y[i] * (j - i) + i * (y[i] - y[j]); return A*k + B*y[k] + C > 0; } int maximum_deevs(vector<int> y) { int ans = 1; int n = y.size(); for(int b = 0; b < (1 << n); ++b) { bool valid = 1; int count = 0; for(int i = 0; i < n; ++i) { if(!(b & (1 << i))) continue; ++count; for(int j = i + 1; j < n; ++j) { if(!(b & (1 << j))) continue; bool block = 0; for(int k = i + 1; k < j; ++k) { block |= check(y, i, j, k); } valid &= block; } } if(valid && count > ans) { ans = count; } } return ans; // bool ok[n][n] = {}; // for(int i = 0; i < n; ++i) { // for(int j = i + 2; j < n; ++j) { // for(int k = i + 1; k < j; ++k) { // ok[i][j] = check(y, i, j, k); // } // } // } // int dp[n] = {}; // dp[n] = 1; // for(int i = n - 1; i >= 0; --i) { // dp[i] = 1; // for(int j = i + 2; j < n; ++j) { // if(ok[i][j]) { // dp[i] = max(dp[i], dp[j] + 1); // } // } // ans = max(ans, dp[i]); // } // return ans; }
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