제출 #869905

#제출 시각아이디문제언어결과실행 시간메모리
869905MatjazDetecting Molecules (IOI16_molecules)C++14
100 / 100
39 ms6140 KiB
#include "molecules.h" #include <vector> #include <algorithm> using namespace std; vector<long long> s; long long total; int N; vector<pair<int,int> > tmp; int l,u; vector<int> w; long long sum(int small, int big){ return s[small] + total - s[N - big]; } vector<int> output_vector(int small, int big, int position){ vector<int> v; for (int i=0;i<small;i++) v.push_back(tmp[i].second); if (position != -1) v.push_back(tmp[position].second); for (int i=N-big;i<N;i++) v.push_back(tmp[i].second); return v; } bool works(int small, int big, int position){ long long weight = sum(small, big) + (position != -1 ? w[position] : 0); //printf("%d %d %d: %lld\n", small, big, position, weight); if (l <= weight && weight <= u) return true; return false; } std::vector<int> find_subset(int _l, int _u, std::vector<int> _w) { l = _l; u = _u; w = _w; total = 0; N = w.size(); for (int i=0;i<N;i++) total += w[i]; tmp.assign(N, make_pair(-1,-1)); for (int i=0;i<N;i++){ tmp[i].first = w[i]; tmp[i].second = i; } sort(tmp.begin(), tmp.end()); for (int i=0;i<N;i++) w[i] = tmp[i].first; s.assign(N + 1, 0); s[0] = 0; for(int i=0;i<N;i++) s[i + 1] = s[i] + w[i]; int l_count = 1; int u_count = N; while (l_count <= u_count){ int count = l_count + (u_count - l_count) / 2; //printf("%d\n", count); if (sum(0, count) < l) { l_count = count + 1; continue; } if (u < sum(count, 0)) { u_count = count - 1; continue; } for (int left=1; left<=count;left++){ int l_traveler = left - 1; int u_traveler = N - count + left - 1; while (l_traveler <= u_traveler){ int traveler = l_traveler + (u_traveler - l_traveler) / 2; if (works(left - 1, count - left, traveler)) return output_vector(left - 1, count - left, traveler); if (sum(left - 1 , count - left) + w[traveler] < l){ l_traveler = traveler + 1; } else u_traveler = traveler - 1; } } } return std::vector<int>(0); }
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