Submission #1263578

#TimeUsernameProblemLanguageResultExecution timeMemory
1263578tminhXORanges (eJOI19_xoranges)C++20
100 / 100
51 ms3912 KiB
#include "bits/stdc++.h" using namespace std; #define task "" #define ll long long #define endl '\n' #define fi first #define se second #define vall(a) (a).begin(), (a).end() #define sze(a) (int)a.size() #define pii pair<int, int> #define pll pair<ll, ll> #define ep emplace_back #define pb push_back #define pf push_front const ll mod = 1e9 + 7; const int N = 1e6 + 5; const ll oo = 1e18; bool START; int n, q, a[N]; struct BIT { int bit[N]; void add(int idx, int delta) { for (; idx <= n; idx += idx & -idx) bit[idx] ^= delta; } int get(int idx) { int ans = 0; for (; idx > 0; idx -= idx & -idx) ans ^= bit[idx]; return ans; } int get(int l, int r) { return get(r) ^ get(l - 1); } } bit[2]; inline void solve() { while(q--) { int t; cin >> t; if (t == 1) { int i, x; cin >> i >> x; bit[i & 1].add(i, a[i]); a[i] = x; bit[i & 1].add(i, a[i]); } if (t == 2) { int l, r; cin >> l >> r; int len = (r - l + 1); if (!(len & 1)) { cout << 0 << endl; continue; } cout << bit[r & 1].get(l, r) << endl; } } } inline void input() { cin >> n >> q; for (int i = 1; i <= n; ++i) { cin >> a[i]; bit[i & 1].add(i, a[i]); } return solve(); } bool END; int main() { if(fopen(task ".inp", "r")) { freopen(task ".inp", "r", stdin); freopen(task ".out", "w", stdout); } ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr); input(); cerr << endl << "Time elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << 's' << endl; cerr << "Memory: " << fabs ((&END - &START)) / 1048576.0 << "MB\n"; return 0; }

Compilation message (stderr)

xoranges.cpp: In function 'int main()':
xoranges.cpp:81:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   81 |         freopen(task ".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
xoranges.cpp:82:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   82 |         freopen(task ".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
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