Submission #93308

#	Time	Username	Problem	Language	Result	Execution time	Memory
93308		3zp	Bank (IZhO14_bank)	C++14	100 / 100	612 ms	21100 KiB

bank

#include<bits/stdc++.h>
using namespace std;
int n, m;
int f[2000009];
int A[2000009], B[2000009];
long long C[2000009];
void CO(vector<int> &a, vector<int> b){
    for(int i = 0; i < (1 << m); i++)
        A[i] = 0, B[i] = 0;
    for(int i = 0; i < a.size(); i++)
        A[a[i]] = 1;
    for(int i = 0; i < b.size(); i++)
        B[b[i]] = 1;
    for(int i = 0; i < m; i++)
        for(int j = 0; j < (1 << m); j++)
            if(j & (1 << i)) 
                A[j] += A[j ^ (1 << i)],
                B[j] += B[j ^ (1 << i)];
    for(int i = 0; i < (1 << m); i++)
        C[i] = A[i] * B[i];
    for(int i = 0; i < m; i++)
        for(int j = 0; j < (1 << m); j++)
            if(j & (1 << i))
                C[j] -= C[j ^ (1 << i)];
    a.clear();
    for(int i = 0; i < (1 << m); i++)
        if(C[i]) a.push_back(i);
}
int aa[1009], bb[1009];
vector<int> v[29];
main(){
    int N, M;
    vector<int> a, b;
    cin >> N >> M;
    int sa = 0;
    for(int i = 0; i < N; i++){
        int k;
        cin >> k;
        aa[k] ++;
    }
    for(int i = 0; i < M; i++){
        int k;
        cin >> k;
        bb[k] ++;
    }
    for(int i = 0; i <= 1000; i++){
        for(int j = min(aa[i], bb[i]); j < aa[i]; j++)
            a.push_back(i);
        for(int j = min(aa[i], bb[i]); j < bb[i]; j++)
            b.push_back(i);
    }
    n = a.size(); m = b.size();
    for(int i = 0; i < n; i++){
        sa += a[i];
    }
    if(2 * n > m) {
        cout << "NO" << endl;
        return 0;
    }
    if(n == 0){
        cout << "YES" << endl;
        return 0;
    }
    for(int i = 0; i < (1 << m); i++){
        int S = 0, k = 0;
        for(int j = 0; j < m; j++){
            if((1 << j) & i) 
                S += b[j], k++;
        }
        if(S == sa) f[i] = 1;
        if(k > m - n + 1) continue;
        for(int j = 0; j < n; j++){
            if(a[j] == S) v[j].push_back(i);
        }
    }
    vector<int> V;
    V.push_back(0);
    for(int i = 0; i < n; i++){
        CO(V, v[i]);
    }
    for(int i = 0; i < V.size(); i++){
        if(f[V[i]]){
            cout <<"YES"<<endl;
            return 0;
        }
    }
    cout << "NO" << endl;
}

Compilation message (stderr)

bank.cpp: In function 'void CO(std::vector<int>&, std::vector<int>)':
bank.cpp:10:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < a.size(); i++)
                    ~~^~~~~~~~~~
bank.cpp:12:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < b.size(); i++)
                    ~~^~~~~~~~~~
bank.cpp: At global scope:
bank.cpp:31:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^
bank.cpp: In function 'int main()':
bank.cpp:81:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i = 0; i < V.size(); i++){
                    ~~^~~~~~~~~~

• Subtask 1: 19 / 19
• Subtask 2: 25 / 25
• Subtask 3: 27 / 27
• Subtask 4: 29 / 29