Submission #208625

#	Time	Username	Problem	Language	Result	Execution time	Memory
208625		DavidDamian	Detecting Molecules (IOI16_molecules)	C++11	Compilation error	0 ms	0 KiB

molecules

#include "molecules.h"
#include<bits/stdc++.h>
using namespace std;
typedef pair<int,int> pii;
map<pii,short> memo;
int S[200005];
int A[100005];
bool possible(int i,int L,int R)
{
    if(L<0 || i==0 || S[i]<L) return false;
    if(L<=A[i] && A[i]<=R) return true;
    if(memo[pii(i,L)]==0){
        bool ans=possible(i-1,L-A[i],R-A[i]) || possible(i-1,L,R);
        if(ans) memo[pii(i,L)]=1;
        else memo[pii(i,L)]=-1;
    }
    if(memo[pii(i,L)]==-1) return false;
    else return true;
}
void createSubset(vector<int>& ans,int i,int L,int R)
{
    if(L<=A[i] && A[i]<=R){
        ans.push_back(i-1);
        return;
    }
    if(possible(i-1,L-A[i],R-A[i])){
        ans.push_back(i-1);
        createSubset(ans,i-1,L-A[i],R-A[i]);
    }
    else{
        createSubset(ans,i-1,L,R);
    }
}
vector<int> find_subset(int l, int r, vector<int> w) {
    for(int i=0;i<w.size();i++){
        A[i+1]=w[i];
    }
    for(int i=1;i<=n;i++){
        S[i]=S[i-1]+A[i];
    }
    vector<int> subset;
    if(possible(w.size(),l,r)){
        createSubset(subset,w.size(),l,r);
    }
    return subset;
}

Compilation message (stderr)

molecules.cpp: In function 'std::vector<int> find_subset(int, int, std::vector<int>)':
molecules.cpp:35:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<w.size();i++){
                 ~^~~~~~~~~
molecules.cpp:38:20: error: 'n' was not declared in this scope
     for(int i=1;i<=n;i++){
                    ^