Submission #679612

#	Time	Username	Problem	Language	Result	Execution time	Memory
679612		alirezasamimi100	Aliens (IOI16_aliens)	C++17	Compilation error	0 ms	0 KiB

aliens

    #include "aliens.h"
    #include <bits/stdc++.h>
    using namespace std;
    using ll = long long int;
    using pll = pair<ll, ll>;
    using ld = long double;
    using pld = pair<ld, int>;
    using pdd = pair<ld, ld>;
    #define pb push_back
    #define F first
    #define S second
    const ld eps = 1e-19;
    const int N = 1e5 + 10;
     
    vector<pll> vec;
    pld dp[N];
    int n;
    struct CHT{
      const ld INF=1e18;
      pair<ld, pair<pdd,int>> A[N];
      int L, R;
      CHT(){
        L=R=0;
      }
      inline ld Intersect(pdd a, pdd b){
        if (a.first==b.first) return (a.second>=b.second?-INF:INF);
        return (a.second-b.second)/(b.first-a.first);
      }
      inline void Add(pair<pdd,int> X){
        while (L<R && Intersect(A[R-1].second.first, X.first)<=A[R-1].first) R--;
        if (L==R) A[R++]={-INF, X};
        else A[R]={Intersect(A[R-1].second.first, X.first), X}, R++;
      }
      inline pld GetMin(ld x){
        while (L+1<R && A[L+1].first<=x) L++;
        return {A[L].second.first.first*x + A[L].second.first.second,A[L].second.second};
      }
    } cht;
    void solve(ld cs){
      cht.L=cht.R=0;
      for(int i=1; i<=n; i++){
        ld x=vec[i-1].S-vec[i].F+1;
        if(x>=0) x*=x;
        else x=0;
        cht.Add({{(ld)-vec[i].F,cs+dp[i-1].F+vec[i].F*vec[i].F-x},dp[i-1].S+1});
        dp[i]=cht.GetMin(2*(vec[i].S+1));
        dp[i].F+=(vec[i].S+1)*(vec[i].S+1);
      }
    }
    ll take_photos(int n, int m, int k, vector<int> R, vector<int> C) {
      vector<pll> tp={{-1,-1}};
      for(int i=0; i<n; i++){
        if(R[i]>C[i]) swap(R[i],C[i]);
        tp.pb({R[i],C[i]});
      }
      sort(tp.begin(),tp.end());
      for(auto [x,y] : tp){
        while(!vec.empty() && vec.back().F==x) vec.pop_back();
        if(vec.empty() || vec.back().S<y) vec.pb({x,y});
      }
      n=(int)vec.size()-1;
      ::n=n;
      ll l=0,r=1e13;
      while(r-l>1){
        ll m=(l+r)/2;
        solve(m);
        if(dp[n].S<=k) r=m;
        else l=m;
      }
      solve(l);
      int x1 = dp[n].S;
      ll y1 = dp[n].F - l * x1;
      solve(r);
      int x2 = dp[n].S;
      ll y2 = dp[n].F - r * x2;
      if(x2 == k) return y2;
      return y1 + (x1 - k) * l;
    }

Compilation message (stderr)

aliens.cpp:14:5: error: extended character   is not valid in an identifier
   14 |      
      |     ^
aliens.cpp:14:5: error: '\U000000a0' does not name a type
   14 |      
      |     ^
aliens.cpp: In function 'void solve(ld)':
aliens.cpp:42:14: error: 'vec' was not declared in this scope
   42 |         ld x=vec[i-1].S-vec[i].F+1;
      |              ^~~
aliens.cpp:45:79: error: cannot convert '<brace-enclosed initializer list>' to 'std::pair<std::pair<long double, long double>, int>'
   45 |         cht.Add({{(ld)-vec[i].F,cs+dp[i-1].F+vec[i].F*vec[i].F-x},dp[i-1].S+1});
      |                                                                               ^
aliens.cpp:29:37: note:   initializing argument 1 of 'void CHT::Add(std::pair<std::pair<long double, long double>, int>)'
   29 |       inline void Add(pair<pdd,int> X){
      |                       ~~~~~~~~~~~~~~^
aliens.cpp: In function 'll take_photos(int, int, int, std::vector<int>, std::vector<int>)':
aliens.cpp:58:16: error: 'vec' was not declared in this scope
   58 |         while(!vec.empty() && vec.back().F==x) vec.pop_back();
      |                ^~~
aliens.cpp:59:12: error: 'vec' was not declared in this scope
   59 |         if(vec.empty() || vec.back().S<y) vec.pb({x,y});
      |            ^~~
aliens.cpp:61:14: error: 'vec' was not declared in this scope
   61 |       n=(int)vec.size()-1;
      |              ^~~