Submission #1015518

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Source Code Expand

#include <algorithm>
#include <cassert>
#include <cfloat>
#include <climits>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <deque>
#include <iomanip>
#include <iostream>
#include <limits>
#include <map>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <vector>

#define FOR(i,k,n) for (int (i)=(k); (i)<(n); ++(i))
#define rep(i,n) FOR(i,0,n)
#define pb push_back
#define eb emplace_back
#define mp make_pair
#define fst first
#define snd second
#define all(v) begin(v), end(v)
#define debug(x) cerr<< #x <<": "<<x<<endl
#define debug2(x,y) cerr<< #x <<": "<< x <<", "<< #y <<": "<< y <<endl

using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<vector<int> > vvi;
typedef vector<ll> vll;
typedef vector<vector<ll> > vvll;
template<class T> using vv=vector<vector< T > >;

int main() {
  ll n, x;
  scanf("%lld %lld", &n, &x);
  vll w(n);
  rep(i, n) {
    scanf("%lld", &w[i]);
  }
  sort(all(w));
  w.erase(upper_bound(all(w), x), end(w));
  int len = w.size();
  int len1 = len / 2;
  int len2 = len - len1;
  vll w1(len1);
  vll w2(len2);
  rep (i, len1) {
    w1[i] = w[i];
  }
  rep (i, len2) {
    w2[i] = w[i + len1];
  }
  ll loop;
  loop = 1;
  rep (i, len1) {
    loop *= 2;
  }
  map<ll, ll> psum1;
  rep (i, loop) {
    ll psum = 0;
    rep (j, len1) {
      if ((i >> j) % 2 == 1) {
        psum += w1[j];
      }
    }
    psum1[psum] += 1;
  }

  loop = 1;
  rep (i, len2) {
    loop *= 2;
  }
  map<ll, ll> psum2;
  rep (i, loop) {
    ll psum = 0;
    rep (j, len2) {
      if ((i >> j) % 2 == 1) {
        psum += w2[j];
      }
    }
    psum2[psum] += 1;
  }

  ll ans = 0;
  for (auto p : psum1) {
    ll s1 = p.first;
    ans += p.second * psum2[x - s1];
  }
  printf("%lld\n", ans);

  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:43:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%lld %lld", &n, &x);
                             ^
./Main.cpp:46:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%lld", &w[i]);
                         ^

Judge Result