Submission #239257

#	Time	Username	Problem	Language	Result	Execution time	Memory
239257		urd05	Detecting Molecules (IOI16_molecules)	C++14	46 / 100	1091 ms	13848 KiB

molecules

#include <bits/stdc++.h>
using namespace std;

long long dp[10001][170];

bool val(int x,int y) {
    return (dp[x][y/64]>>(y%64))&1;
}

vector<int> find_subset(int l, int u,vector<int> w) {
    dp[0][0]=1;
    for(int i=0;i<w.size();i++) {
        int ind=i+1;
        for(int j=0;j<=u;j++) {
            if (j+w[i]<=u) {
                if (val(ind-1,j)) {
                    dp[ind][(j+w[i])/64]|=(1LL<<((j+w[i])%64));
                }
            }
            if (val(ind-1,j)) {
                dp[ind][j/64]|=(1LL<<(j%64));
            }
        }
    }
    int n=w.size();
    int pos=-1;
    for(int i=l;i<=u;i++) {
        if (val(n,i)) {
            pos=i;
        }
    }
    if (pos==-1) {
        vector<int> emp;
        return emp;
    }
    vector<int> ret;
    int sum=pos;
    for(int i=n-1;i>=0;i--) {
        if (sum>=w[i]&&val(i,sum-w[i])) {
            ret.push_back(i);
            sum-=w[i];
        }
    }
    return ret;
}

Compilation message (stderr)

molecules.cpp: In function 'std::vector<int> find_subset(int, int, std::vector<int>)':
molecules.cpp:12:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<w.size();i++) {
                 ~^~~~~~~~~

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