Submission #1017273

#TimeUsernameProblemLanguageResultExecution timeMemory
1017273khanhphucscratchAliens (IOI16_aliens)C++14
Compilation error
0 ms0 KiB
#include<bits/stdc++.h> #include "aliens.h" #define int long long using namespace std; struct CHT { vector<pair<int, int>> line; vector<double> hull; double intersection(pair<int, int> x, pair<int, int> y) { return (double)(x.second - y.second) / (y.first - x.first); } void addline(pair<int, int> x) { while(hull.size() > 0 && intersection(x, line[line.size()-1]) <= hull[hull.size()-1]){ hull.pop_back(); line.pop_back(); } if(line.size() > 0) hull.push_back(intersection(line[line.size()-1], x)); line.push_back(x); } int bestval(int x) { if(line.size() == 0) return 1e15; int place = lower_bound(hull.begin(), hull.end(), x) - hull.begin(); return line[place].first*x+line[place].second; } }; CHT st[1005]; int dp[1005][505], last[1005]; inline bool cmp(pair<int, int> x, pair<int, int> y) { return x.second < y.second || (x.second == y.second && x.first > y.first); } int take_photos(int n, int m, int k, int r[], int c[]) { //Transform to segments vector<pair<int, int>> segment; for(int i = 0; i < n; i++){ if(r[i] <= c[i]) segment.push_back({r[i], c[i]+1}); else segment.push_back({c[i], r[i]+1}); } //Eliminate unnecessary segments sort(segment.begin(), segment.end(), cmp); vector<pair<int, int>> sus; for(pair<int, int> i : segment){ if(sus.size() > 0 && sus[sus.size()-1].first >= i.first && sus[sus.size()-1].second <= i.second){ sus.pop_back(); } sus.push_back(i); } memset(last, -1, sizeof(last)); for(pair<int, int> i : sus){ last[i.second] = i.first; } //O(mk log n) dp int lastplace = -1; st[0].addline({0, 0}); for(int i = 0; i <= m; i++){ for(int j = 0; j <= k; j++) if(last[i] > -1){ pair<int, int> newline = make_pair(-2*last[i], last[i]*last[i]); if(lastplace > -1) newline.second += dp[lastplace][j]; st[j].addline(newline); } for(int j = 0; j <= k; j++){ if(last[i] == -1) dp[i][j] = dp[i-1][j]; else{ //cout<<st[0].bestval(i)<<endl; if(j > 0) dp[i][j] = i*i + st[j-1].bestval(i); else dp[i][j] = 1e15; } //cout<<i<<" "<<j<<" "<<dp[i][j]<<endl; } if(last[i] > -1) lastplace = i; } int ans = 1e18; for(int i = 0; i <= k; i++) ans = min(ans, dp[m][i]); return ans; } /*signed main() { int x[2] = {1, 4}, y[2] = {4, 1}; cout<<take_photos(2, 6, 2, x, y); }*/

Compilation message (stderr)

/usr/bin/ld: /tmp/cccmSWXE.o: in function `main':
grader.cpp:(.text.startup+0xf0): undefined reference to `take_photos(int, int, int, std::vector<int, std::allocator<int> >, std::vector<int, std::allocator<int> >)'
collect2: error: ld returned 1 exit status