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Submission #270478

# Submission time Handle Problem Language Result Execution time Memory
270478 2020-08-17T16:23:17 Z egekabas XOR Sum (info1cup17_xorsum) C++14
45 / 100
 436 ms 16488 KB 
#include <bits/stdc++.h>
#define aint(x) (x).begin(), (x).end()
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
using namespace std;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ld, ld> pld;
int n, a[1000009];
vector<pii> old, cur;
int ans = 0;
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    
    //freopen("in.txt", "r", stdin);
    //freopen("out.txt", "w", stdout);

    cin >> n;
    old.resize(n);
    for(int i = 0; i < n; ++i)
        cin >> old[i].ff;
    for(int bit = 0; bit < 32; ++bit){
        for(auto u : old)
            if((u.ff&(1<<bit)) == 0)
                cur.pb(u);
        
        for(auto u : old)
            if((u.ff&(1<<bit)))
                cur.pb({u.ff, u.ss+(1<<bit)});
        
    
        int i1, i2, i3;
        i1 = i2 = i3 = n-1;
        int cnt = 0;
        for(int i = 0; i < n; ++i){
            i1 = max(i1, i-1);
            i2 = max(i2, i-1);
            i3 = max(i3, i-1);
            
            while(i1 >= i && cur[i].ss+cur[i1].ss >= (1<<bit))
                --i1;
            while(i2 >= i && cur[i].ss+cur[i2].ss >= (1<<(bit+1)))
                --i2;
            while(i3 >= i && cur[i].ss+cur[i3].ss >= (1<<(bit+1))+(1<<bit))
                --i3;
            
            cnt += i2-i1+n-1-i3;
        }
        if(cnt%2)
            ans += (1<<bit);
        swap(old, cur);
        cur.clear();
    }
    cout << ans << '\n';
}

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 384 KB Output is correct
2 Correct 4 ms 384 KB Output is correct

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 436 ms 16488 KB Output is correct
2 Incorrect 379 ms 15976 KB Output isn't correct

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Correct 436 ms 16488 KB Output is correct
2 Incorrect 379 ms 15976 KB Output isn't correct

Subtask #4
38.0 / 38.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 384 KB Output is correct
2 Correct 4 ms 384 KB Output is correct
3 Correct 73 ms 2300 KB Output is correct
4 Correct 76 ms 2300 KB Output is correct

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 384 KB Output is correct
2 Correct 4 ms 384 KB Output is correct
3 Correct 436 ms 16488 KB Output is correct
4 Incorrect 379 ms 15976 KB Output isn't correct