Submission #416866

#	Time	Username	Problem	Language	Result	Execution time	Memory
416866		snasibov05	Detecting Molecules (IOI16_molecules)	C++14	31 / 100	38 ms	65540 KiB

molecules

#include "molecules.h"
#include <algorithm>

using namespace std;

#define pb push_back

vector<vector<vector<bool>>> knapsack(vector<int>& w){
    int n = w.size();

    int sum = 0;
    for (int i = 0; i < n; ++i) sum += w[i];

    vector<vector<vector<bool>>> dp(2, vector<vector<bool>>(n, vector<bool>(sum+1)));
    dp[1][0][w[0]] = true;
    dp[0][0][0] = true;

    for (int i = 0; i < n - 1; ++i) {
        for (int j = 0; j <= sum; ++j) {
            if (dp[0][i][j] || dp[1][i][j]){
                dp[0][i+1][j] = true;
                dp[1][i+1][j + w[i+1]] = true;
            }
        }
    }

    return dp;
}

vector<int> find_subset(int l, int u, vector<int> w) {

    int n = w.size();
    vector<vector<vector<bool>>> dp = knapsack(w);

    int res = -1;
    for (int i = l; i <= u && i < dp[0][n-1].size(); ++i) {
        if (dp[1][n-1][i] || dp[0][n-1][i]) {
            res = i;
            break;
        }
    }

    vector<int> ans;
    if (res == -1) return ans;
    for (int i = n-1; i >= 0; --i){
        if (dp[1][i][res]){
            ans.pb(i);
            res -= w[i];
        }
    }
    reverse(ans.begin(), ans.end());
    return ans;

}

Compilation message (stderr)

molecules.cpp: In function 'std::vector<int> find_subset(int, int, std::vector<int>)':
molecules.cpp:36:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<bool>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |     for (int i = l; i <= u && i < dp[0][n-1].size(); ++i) {
      |                               ~~^~~~~~~~~~~~~~~~~~~

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