Submission #679588

#	Time	Username	Problem	Language	Result	Execution time	Memory
679588		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;
        ll cf = (y2 - y1) / (x2 - x1);
        ll ans = y1 + (k - x1) * cf;
        return ans;
    }

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:42:18: error: 'vec' was not declared in this scope
   42 |             ld x=vec[i-1].S-vec[i].F+1;
      |                  ^~~
aliens.cpp:45:83: 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:29:39: 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:58:20: error: 'vec' was not declared in this scope
   58 |             while(!vec.empty() && vec.back().F==x) vec.pop_back();
      |                    ^~~
aliens.cpp:59:16: error: 'vec' was not declared in this scope
   59 |             if(vec.empty() || vec.back().S<y) vec.pb({x,y});
      |                ^~~
aliens.cpp:61:16: error: 'vec' was not declared in this scope
   61 |         n=(int)vec.size()-1;
      |                ^~~