Create 2019-G-B.cpp

Author: tmp-coder

kick-start/2019-G-B.cpp

@@ -0,0 +1,65 @@
+#include<bits/stdc++.h>
+#define ms(x,v) memset((x),v,sizeof(x))
+#define INF 0x3f3f3f3f
+using namespace std;
+ 
+const int MAXN = 100+10;
+typedef long long LL;
+
+
+void solve(){
+    LL N,M;
+    cin >> N >> M;
+    LL ans =0;
+    LL sum[64];
+    ms(sum,0);
+    const int MAX_BIT = 52;
+    for(int i=0 ;i< N ; ++i){
+        LL x;
+        cin >> x;
+        for(int j =0;j<MAX_BIT ; ++j)
+            if((x >>j) & 1)sum[j] ++;
+            
+    }
+    vector<LL> dp(MAX_BIT+1,0);
+    dp[0] = 0;
+    for(int i=0; i<MAX_BIT ; ++i){
+        dp[i+1] = dp[i] + min(sum[i],N-sum[i]) * (1LL << i);
+    }
+    for(int j = MAX_BIT -1 ; j>=0 ; --j){
+        LL val = (N-sum[j]) * (1LL << j);
+        if(dp[j] <= M - val){
+            ans |= (1LL << j);
+            M-=val;
+        }else{
+            M-=sum[j] * (1LL << j);
+        }
+        if( M < dp[j]){
+            ans = -1;
+            break;
+        }
+    }
+    cout << ans << "\n";
+}
+
+
+
+
+int main(){
+    ios :: sync_with_stdio(0);
+    cin.tie(0);
+    // cout.tie(0);
+    std::cout.precision(10);
+    std::cout.setf( std::ios::fixed, std:: ios::floatfield );
+ 
+    int T;
+    cin >> T;
+    for(int tt =1 ; tt <=T ; ++tt)
+    {
+        cout << "Case #" << tt << ": ";
+        solve();
+    }
+    
+ 
+    return 0;
+}