oj.uz

Submission #918384

# Submission time Handle Problem Language Result Execution time Memory
918384 2024-01-29T18:42:19 Z divad XOR Sum (info1cup17_xorsum) C++14
0 / 100
 1600 ms 4184 KB 
#include <bits/stdc++.h>
using namespace std;
using pii = pair<int, int>;
const int NMAX = 1e6+2;
int n,v[NMAX];

void bitrep(int n){
    for(int i = 0; i < 8; i++){
        int bt = (n>>i)&1;
        cout << bt;
    }
    cout << " = " << n << "\n";
}

int brut(int k){
    int ans = 0;
    int mod = (1<<(k+1));
    int l = (1<<k), r = (1<<(k+1))-1;
    for(int i = 1; i <= n; i++){
        for(int j = 1; j <= i; j++){
            int sum = (v[i]+v[j])%mod;
            int bt = (sum>>k)&1;
            if(bt){
                assert(l <= sum && sum <= r);
            }
            ans += bt;
        }
    }
    return ans;
}

bool inauntru(int x, pii interv){
    auto [l, r] = interv;
    return (l <= x && x <= r);
}

int cnt(int k){
    int mod = (1<<(k+1));
    int ans = 0;
    for(int i = 1; i <= n; i++){
        int val = v[i]%mod;
        int l = (1<<k), r = (1<<(k+1))-1;
        l = (l-val+mod)%mod;
        r = (r-val+mod)%mod;
        pii ranges[2];
        if(l <= r){
            ranges[0] = ranges[1] = {l, r};
        }else{
            ranges[0] = {0, r};
            ranges[1] = {l, (1<<(k+1))-1};
        }
        for(int j = 1; j <= i; j++){
            if(inauntru(v[j]%mod, ranges[0]) || inauntru(v[j]%mod, ranges[1])){
                ans++;
            }
        }
    }
    return ans;
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> n;
    for(int i = 1; i <= n; i++){
        cin >> v[i];
    }
    int ans = 0;
    for(int i = 0; i < 30; i++){
        ans += (cnt(i)&1)*(1<<i);
    }
    cout << ans;
    return 0;
}

Compilation message

xorsum.cpp: In function 'bool inauntru(int, pii)':
xorsum.cpp:33:10: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   33 |     auto [l, r] = interv;
      |          ^

Subtask #1
0 / 7.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1647 ms 348 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #2
0 / 11.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1642 ms 4184 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #3
0 / 21.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1642 ms 4184 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #4
0 / 38.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1647 ms 348 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #5
0 / 23.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1647 ms 348 KB Time limit exceeded
2 Halted 0 ms 0 KB -