結果
問題 | No.1072 A Nice XOR Pair |
ユーザー |
![]() |
提出日時 | 2020-06-05 21:37:45 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 178 ms / 2,000 ms |
コード長 | 2,514 bytes |
コンパイル時間 | 2,308 ms |
コンパイル使用メモリ | 198,288 KB |
最終ジャッジ日時 | 2025-01-10 22:16:47 |
ジャッジサーバーID (参考情報) |
judge5 / judge1 |
(要ログイン)
ファイルパターン | 結果 |
---|---|
sample | AC * 2 |
other | AC * 11 |
コンパイルメッセージ
main.cpp: In function ‘int main()’: main.cpp:60:8: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result] 60 | scanf("%d%d",&n,&x); | ~~~~~^~~~~~~~~~~~~~ main.cpp:64:10: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result] 64 | scanf("%d",&a); | ~~~~~^~~~~~~~~
ソースコード
#include <bits/stdc++.h>#define fi first#define se second#define rep(i,n) for(int i = 0; i < (n); ++i)#define rrep(i,n) for(int i = 1; i <= (n); ++i)#define drep(i,n) for(int i = (n)-1; i >= 0; --i)#define srep(i,s,t) for (int i = s; i < t; ++i)#define rng(a) a.begin(),a.end()#define rrng(a) a.rbegin(),a.rend()#define maxs(x,y) (x = max(x,y))#define mins(x,y) (x = min(x,y))#define isin(x,l,r) ((l) <= (x) && (x) < (r))#define pb push_back#define eb emplace_back#define sz(x) (int)(x).size()#define pcnt __builtin_popcountll#define uni(x) x.erase(unique(rng(x)),x.end())#define snuke srand((unsigned)clock()+(unsigned)time(NULL));#define show(x) cout<<#x<<" = "<<x<<endl;#define PQ(T) priority_queue<T,v(T),greater<T> >#define bn(x) ((1<<x)-1)#define dup(x,y) (((x)+(y)-1)/(y))#define newline puts("")#define v(T) vector<T>#define vv(T) v(v(T))using namespace std;typedef long long int ll;typedef unsigned uint;typedef unsigned long long ull;typedef pair<int,int> P;typedef tuple<int,int,int> T;typedef vector<int> vi;typedef vector<vi> vvi;typedef vector<ll> vl;typedef vector<P> vp;typedef vector<T> vt;inline int getInt() { int x; scanf("%d",&x); return x;}template<typename T>inline istream& operator>>(istream&i,v(T)&v){rep(j,sz(v))i>>v[j];return i;}template<typename T>string join(const v(T)&v){stringstream s;rep(i,sz(v))s<<' '<<v[i];return s.str().substr(1);}template<typename T>inline ostream& operator<<(ostream&o,const v(T)&v){if(sz(v))o<<join(v);return o;}template<typename T1,typename T2>inline istream& operator>>(istream&i,pair<T1,T2>&v){return i>>v.fi>>v.se;}template<typename T1,typename T2>inline ostream& operator<<(ostream&o,const pair<T1,T2>&v){return o<<v.fi<<","<<v.se;}template<typename T>inline ll suma(const v(T)& a) { ll res(0); for (auto&& x : a) res += x; return res;}const double eps = 1e-10;const ll LINF = 1001002003004005006ll;const int INF = 1001001001;#define dame { puts("-1"); return 0;}#define yn {puts("Yes");}else{puts("No");}const int MX = 200005;int main() {int n,x;scanf("%d%d",&n,&x);map<int,int> mp;rep(i,n) {int a;scanf("%d",&a);mp[a]++;}ll ans = 0;if (x == 0) {for (auto p : mp) {ans += ll(p.se)*(p.se-1)/2;}} else {for (auto p : mp) {int y = x^p.fi;if (y < p.fi) continue;auto it = mp.find(y);if (it != mp.end()) {ans += ll(p.se)*it->se;}}}cout<<ans<<endl;return 0;}