Submission #779447

#	Time	Username	Problem	Language	Result	Execution time	Memory
779447		JoenPoenMan	Detecting Molecules (IOI16_molecules)	C++17	9 / 100	1 ms	300 KiB

molecules

#include "molecules.h"
#include <bits/stdc++.h>
 
using namespace std;
#define fullVec(arr) arr.begin(), arr.end()

typedef pair<int, int> ii;

std::vector<int> find_subset(int l, int u, std::vector<int> w) {
    vector<bool> subset(w.size(), false);
    vector<ii> sw;
    for (int i = 0; i < w.size(); i++) {
        sw.push_back({w[i], i});
    }
    sort(fullVec(sw));
    int sum = 0;
    
    for (int attempts = 5*w.size(); attempts >= 0; attempts--) {
        if (sum < l) {
            bool suc = false;
            for (auto [weight, ind] : sw) if (!subset[ind]) {
                if (sum + weight >= l) {
                    subset[ind] = true;
                    sum += weight;
                    suc = true;
                    break;
                }
            }
            if (!suc) {
                for (int i = sw.size()-1; i >= 0; i--) if (!subset[sw[i].second]) {
                    auto [weight, ind] = sw[i];
                    subset[ind] = true;
                    sum += weight;
                    break;
                }
            }
        } else if (sum > u) {
            bool suc = false;
            for (auto [weight, ind] : sw) if (!subset[ind]) {
                if (sum - weight <= u) {
                    subset[ind] = true;
                    sum -= weight;
                    suc = true;
                    break;
                }
            }
            if (!suc) {
                for (int i = sw.size()-1; i >= 0; i--) if (!subset[sw[i].second]) {
                    auto [weight, ind] = sw[i];
                    subset[ind] = true;
                    sum -= weight;
                    break;
                }
            }
        } else {
            vector<int> res;
            for (int n = 0; n < subset.size(); n++) if (subset[n]) res.push_back(n);
            return res;
        }
    }
    
 
    return std::vector<int>(0);
}

Compilation message (stderr)

molecules.cpp: In function 'std::vector<int> find_subset(int, int, std::vector<int>)':
molecules.cpp:14:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |     for (int i = 0; i < w.size(); i++) {
      |                     ~~^~~~~~~~~~
molecules.cpp:59:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<bool>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |             for (int n = 0; n < subset.size(); n++) if (subset[n]) res.push_back(n);
      |                             ~~^~~~~~~~~~~~~~~

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