Submission #321832

#	Time	Username	Problem	Language	Result	Execution time	Memory
321832		nikatamliani	Detecting Molecules (IOI16_molecules)	C++14	100 / 100	73 ms	4844 KiB

molecules

#include "molecules.h"
#include <bits/stdc++.h>
using namespace std;
vector<int> find_subset(int l, int u, vector<int>w) {
	int n = w.size();
    vector<int> indices(n);
    for(int i = 0; i < n; ++i) {
        indices[i] = i; 
    }
    sort(indices.begin(), indices.end(), [&](int x, int y) {
        return w[x] > w[y];
    });
    #define ll long long
    vector<int> result;
    ll sum = 0, save = n + 1;
    for(int i = 0; i < n; ++i) {
        int index = indices[i]; 
        sum += w[index];
        result.push_back(index);
        if(sum >= l) {
            save = i + 1;
            break;
        }
    }
    if(save == n + 1) {
    	return vector<int>{};
	}
	int from = n - 1;
    int ptr = 0; 
    while(from >= save && sum > u && ptr < result.size()) {
        sum -= w[result[ptr]];
        result[ptr] = indices[from--];
        sum += w[result[ptr++]];
        ptr %= (int)result.size();
    }
    if(sum <= u) {
    	if(sum < l)while(true) {}
        assert(sum >= l);
        return result;
    } 
    return vector<int>{};
}

Compilation message (stderr)

molecules.cpp: In function 'std::vector<int> find_subset(int, int, std::vector<int>)':
molecules.cpp:30:42: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |     while(from >= save && sum > u && ptr < result.size()) {
      |                                      ~~~~^~~~~~~~~~~~~~~

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