Submission #61983

#	Time	Username	Problem	Language	Result	Execution time	Memory
61983		fallingstar	Detecting Molecules (IOI16_molecules)	C++14	100 / 100	98 ms	3224 KiB

molecules

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

using namespace std;

vector<int> find_subset(int low, int upp, vector<int> w) {
    int n = w.size();
    vector<int> a(n);
    for (int i = 0; i < n; ++i) a[i] = i;
    sort(a.begin(), a.end(), [&](int x, int y) { return w[x] < w[y]; });

    unsigned int sum = 0;
    for (int i = 0, j = 0; i < n; ++i)
    {
        sum += w[a[i]];
        if (sum > upp) sum -= w[a[j++]];
        if (j > i) break;
        if (low <= sum && sum <= upp) return vector<int>(a.begin() + j, a.begin() + i + 1);
    }
    return vector<int>();
}

Compilation message (stderr)

molecules.cpp: In function 'std::vector<int> find_subset(int, int, std::vector<int>)':
molecules.cpp:16:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if (sum > upp) sum -= w[a[j++]];
             ~~~~^~~~~
molecules.cpp:18:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if (low <= sum && sum <= upp) return vector<int>(a.begin() + j, a.begin() + i + 1);
             ~~~~^~~~~~
molecules.cpp:18:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if (low <= sum && sum <= upp) return vector<int>(a.begin() + j, a.begin() + i + 1);
                           ~~~~^~~~~~

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