Submission #48423

#TimeUsernameProblemLanguageResultExecution timeMemory
48423wzyBuilding Bridges (CEOI17_building)C++11
100 / 100
178 ms9188 KiB
#include <bits/stdc++.h> using namespace std; #define int long long #define pb push_back long long w[100005] , h[100005]; long long n; long long dp[100005]; struct line{ int x , y; line(int x , int y){ this->x = x , this->y = y; } }; bool operator <(line a , line b){ if(a.x == b.x) return a.y > b.y; else return a.x > b.x; } template <class type> class CHT{ public : bool cmp(type a , type b , type c){ return ((double)((double) (c.y) - (a.y)) * ((double) (a.x) - (b.x)) <= ((double) ((double) (a.x) - (c.x)) * ((double) (b.y) - (a.y)) ) ) ; } int sizex(){ return cht.size(); } void addLINE(type a){ while(cht.size() >= 2 && cmp(cht[cht.size() - 2] , cht[cht.size() - 1] , a)){ cht.pop_back(); } cht.push_back(a); } int eval(type b , int a){ int w = (b.x) * a + (b.y); return w; } void mergev(vector<type> nhcht){ vector<type> newcht; for(int i = 0 ; i < nhcht.size() + cht.size() ; i++) newcht.pb(line(0,0)); std::merge(nhcht.begin() , nhcht.end() , cht.begin() , cht.end() , newcht.begin() ); cht.clear(); for(int i = 0 ; i < newcht.size() ; i++) addLINE(newcht[i]); } int querymin(int x){ if(cht.size() == 0) return (int) 1e18; int l = 0 , r = cht.size() - 1; r--; int ansj = -1; while(l<=r){ int mid = (l+r)/2; if(eval(cht[mid] , x) >= eval(cht[mid + 1] , x)){ l = mid + 1; ansj = mid; } else r = mid - 1; } int bestvalue = eval(cht.front() , x); if(ansj != -1) bestvalue = min(bestvalue , eval(cht[ansj] , x)); ansj ++; if(ansj < cht.size()) bestvalue = min(bestvalue , eval(cht[ansj] , x)); return bestvalue; } vector<type> vectorT(){ return cht; } void clearv(){ cht.clear(); } int querymax(int x){ if(cht.size() == 0) return -(int) 1e18; int l = 0 , r = cht.size() - 1; r--; int ansj = -1; while(l<=r){ int mid = (l+r)/2; if(eval(cht[mid] , x) <= eval(cht[mid+1],x)){ l = mid + 1; ansj = mid; } else r = mid - 1; } int bestvalue = eval(cht.front() , x); if(ansj != -1) bestvalue = max(bestvalue , eval(cht[ansj] , x)); ansj++; if(ansj < cht.size()) bestvalue = max(bestvalue ,eval(cht[ansj] , x)); return bestvalue; } // private : // adicionar merge e checksize para fazer binary partition vector<type> cht; }; CHT <line> chts[33]; void addline(line a){ vector<line> v; v.push_back(a); chts[0].mergev(v); for(int i = 0 ; i < 32 ; i++){ int z = (1LL<<i); if(chts[i].sizex() > z){ chts[i+1].mergev(chts[i].vectorT()); chts[i].clearv(); } } return ; } long long query(int x){ long long bestvalue = (long long) 1e18; for(int i = 0 ; i < 32 ; i++){ bestvalue = min(bestvalue , chts[i].querymin(x)); } return bestvalue; } int32_t main(){ scanf("%lld" , &n); dp[0] = 0; for(int i = 1 ; i <=n ;i ++){ scanf("%lld" , &h[i]); } w[0] = 0; for(int i = 1 ; i <=n ;i ++){ scanf("%lld" , &w[i]); w[i] += w[i-1]; } dp[1] = 0; addline(line(-2*h[1] , h[1]*h[1] - w[1] )); for(int i = 2 ; i <= n ;i ++){ dp[i] = query(h[i]) + h[i]*h[i] + w[i-1]; addline(line(-2*h[i] , h[i]*h[i] - w[i] + dp[i])); } printf("%lld\n" , dp[n]); }

Compilation message (stderr)

building.cpp: In instantiation of 'void CHT<type>::mergev(std::vector<_Tp>) [with type = line]':
building.cpp:100:21:   required from here
building.cpp:40:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i = 0 ; i < nhcht.size() + cht.size() ; i++) newcht.pb(line(0,0));
building.cpp:43:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i = 0 ; i < newcht.size() ; i++) addLINE(newcht[i]);
building.cpp: In instantiation of 'long long int CHT<type>::querymin(long long int) [with type = line]':
building.cpp:116:56:   required from here
building.cpp:61:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if(ansj < cht.size()) bestvalue = min(bestvalue , eval(cht[ansj] , x));
building.cpp: In function 'int32_t main()':
building.cpp:123:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%lld" , &n);
  ~~~~~^~~~~~~~~~~~~
building.cpp:126:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld" , &h[i]);
   ~~~~~^~~~~~~~~~~~~~~~
building.cpp:130:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld" , &w[i]);
   ~~~~~^~~~~~~~~~~~~~~~
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