Submission #780703

#	Time	Username	Problem	Language	Result	Execution time	Memory
780703		JoenPoenMan	Detecting Molecules (IOI16_molecules)	C++17	69 / 100	1072 ms	5520 KiB

molecules

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

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;
    long int sum = 0;
    for (int i = 0; i < w.size(); i++) {
        sw.push_back({w[i], i});
    }
    sort(ALL(sw));
    for (int i = 0; i < sw.size() && sum < l; i++) {
        sum += sw[i].first;
        subset[sw[i].second] = true;
    }
    int prevInd = -1;
    int prevRemInd = -1;
    for (int attempts = 2*w.size(); attempts >= 0; attempts--) {
        if (sum < l) {
            prevRemInd = -1;
            bool suc = false;
            if (sw.back().first + sum >= l) 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 = max(0, prevInd); i < sw.size(); i++) if (!subset[sw[i].second]) {
                    auto [weight, ind] = sw[i];
                    subset[ind] = true;
                    sum += weight;
                    suc = true;
                    prevInd = i;
                    break;
                }
            }
            if (!suc) break;
        } else if (sum > u) {
            bool suc = false;
            prevInd = -1;
            if (sum - sw.back().first <= u) for (int i = 0; i < sw.size(); i++) if (subset[sw[i].second]) {
                if (sum - sw[i].first <= u) {
                    auto [weight, ind] = sw[i];
                    sw.erase(sw.begin()+i);
                    subset[ind] = false;
                    sum -= weight;
                    suc = true;
                    break;
                }
            }
            if (!suc) {
                for (int i = max(0, prevRemInd); i < sw.size(); i++) if (subset[sw[i].second]) {
                    auto [weight, ind] = sw[i];
                    sw.erase(sw.begin()+i);
                    subset[ind] = false;
                    sum -= weight;
                    prevRemInd = i;
                    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:15:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |     for (int i = 0; i < w.size(); i++) {
      |                     ~~^~~~~~~~~~
molecules.cpp:19:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |     for (int i = 0; i < sw.size() && sum < l; i++) {
      |                     ~~^~~~~~~~~~~
molecules.cpp:38:49: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |                 for (int i = max(0, prevInd); i < sw.size(); i++) if (!subset[sw[i].second]) {
      |                                               ~~^~~~~~~~~~~
molecules.cpp:51:63: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |             if (sum - sw.back().first <= u) for (int i = 0; i < sw.size(); i++) if (subset[sw[i].second]) {
      |                                                             ~~^~~~~~~~~~~
molecules.cpp:62:52: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   62 |                 for (int i = max(0, prevRemInd); i < sw.size(); i++) if (subset[sw[i].second]) {
      |                                                  ~~^~~~~~~~~~~
molecules.cpp:73:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<bool>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   73 |             for (int n = 0; n < subset.size(); n++) if (subset[n]) res.push_back(n);
      |                             ~~^~~~~~~~~~~~~~~

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