Submission #265598

#	Time	Username	Problem	Language	Result	Execution time	Memory
265598		cjoa	Detecting Molecules (IOI16_molecules)	C++11	46 / 100	880 ms	65540 KiB

molecules

#include "molecules.h"

#include <iostream>
#include <vector>
#include <map>
#include <cassert>

using namespace std;

typedef vector<bool> VI;
typedef vector<VI> VVI;

std::vector<int> find_subset(int l, int u, std::vector<int> w) {
   const int N = w.size();
// assert(N <= 100 && u <= 1000);

   VVI can(N+1, VI(u+1));
   VVI P(N+1, VI(u+1));
   can[0][0] = true;
   for (int n = 0; n < N; ++n) {
      for (int sum = 0; sum <= u; ++sum) {
         if ( can[n][sum] ) {
            can[n+1][sum] = true;
            P[n+1][sum] = false;
            if (sum + w[n] <= u) {
               can[n+1][sum + w[n]] = true;
               P[n+1][sum + w[n]] = true;
            }
         }
      }
   }

   for (int sum = l; sum <= u; ++sum) {
      if (can[N][sum]) {
         vector<int> res;
         for (int n = N, s = sum; s != 0; ) {
            if (P[n][s]) {
               res.push_back(n-1);
               s -= w[n-1];
               --n;
            }
            else {
               --n;
            }
         }
         return res;
      }
   }

   return {};
}

• Subtask 1: 9 / 9
• Subtask 2: 10 / 10
• Subtask 3: 12 / 12
• Subtask 4: 15 / 15
• Subtask 5: 0 / 23
• Subtask 6: 0 / 31