Submission #810647

#	Time	Username	Problem	Language	Result	Execution time	Memory
810647		wortelworm	Detecting Molecules (IOI16_molecules)	C++17	46 / 100	1069 ms	2260 KiB

molecules

// #include "grader.cpp"

#include "molecules.h"
#include <bits/stdc++.h>
using namespace std;


std::vector<int> find_subset(int lower, int upper, std::vector<int> w) {
    // sum -> last weight index
    vector<int> sums(lower, -1);
    sums[0] = 0;

    for (int j = 0; j < w.size(); j++) {

        for (int i = lower - 1; i >= 0; i--)
        {
            if (sums[i] == -1) {
                continue;
            }

            int total_weight = w[j] + i;
            if (total_weight >= lower && total_weight <= upper) {
                // Done!

                // indexes of weights
                vector<int> result;
                int current_weight = total_weight;
                int current_index = j;
                while (current_weight != 0) {
                    result.push_back(current_index);
                    current_weight -= w[current_index];
                    current_index = sums[current_weight];
                }
                return result;
            }

            if (sums[total_weight] != -1) {
                // already found
                continue;
            }

            sums[total_weight] = j;
        }
    }

    return {};
}

Compilation message (stderr)

molecules.cpp: In function 'std::vector<int> find_subset(int, int, std::vector<int>)':
molecules.cpp:13:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |     for (int j = 0; j < w.size(); j++) {
      |                     ~~^~~~~~~~~~

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