Submission #959409

#TimeUsernameProblemLanguageResultExecution timeMemory
959409mansurXOR Sum (info1cup17_xorsum)C++17
100 / 100
726 ms48028 KiB
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native") //#pragma GCC optimize("Ofast,unroll-loops,fast-math,O3") #include<bits/stdc++.h> using namespace std; #define all(a) a.begin(), a.end() #define rall(a) a.rbegin(), a.rend() #define sz(a) (int)a.size() #define s second #define f first using ll = long long; using pii = pair<int, int>; using pll = pair<ll, ll>; mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count()); vector<pii> rid = {{0, 1}, {0, -1}, {1, 0}, {-1, 0}}; vector<pii> dir = {{-1, -1}, {-1, 1}, {1, -1}, {1, 1}}; const int N = 2e5 + 1, mod = 1e9 + 7; const ll inf = 2e18; double eps = 1e-15; bool flg = 0; void slv() { int n; cin >> n; int a[n + 1]; vector<pii> vl; for (int i = 1; i <= n; i++) { cin >> a[i]; vl.push_back({0, a[i]}); } int ans = 0; for (int b = 0; b < 30; b++) { vector<int> s[2]; vector<pii> h, nv; for (int i = 0; i < n; i++) { if (b && (vl[i].s >> (b - 1) & 1)) { vl[i].f += (1 << (b - 1)); h.push_back(vl[i]); }else { nv.push_back(vl[i]); s[vl[i].s >> b & 1].push_back(vl[i].f); } } for (auto x: h) { nv.push_back(x); s[x.s >> b & 1].push_back(x.f); } vl = nv; int pos = sz(s[0]) - 1; for (int i = 0; i < sz(s[0]); i++) { int vl = (1 << b) - s[0][i]; while (pos >= i && s[0][pos] >= vl) pos--; while (pos < i - 1) pos++; int cnt = sz(s[0]) - pos - 1; if (cnt & 1) ans ^= (1 << b); } pos = sz(s[1]) - 1; for (int i = 0; i < sz(s[1]); i++) { int vl = (1 << b) - s[1][i]; while (pos >= i && s[1][pos] >= vl) pos--; while (pos < i - 1) pos++; int cnt = sz(s[1]) - pos - 1; if (cnt & 1) ans ^= (1 << b); } pos = 0; for (int i = sz(s[1]) - 1; i >= 0; i--) { int vl = (1 << b) - s[1][i]; while (pos < sz(s[0]) && s[0][pos] < vl) pos++; if (pos & 1) ans ^= (1 << b); } } cout << ans; } main() { //freopen("input.txt", "r", stdin); //freopen("output.txt", "w", stdout); ios_base::sync_with_stdio(0); cin.tie(0); int tp = 1; if (flg) cin >> tp; while (tp--) { slv(); } } //wenomechainsama

Compilation message (stderr)

xorsum.cpp:84:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   84 | main() {
      | ^~~~
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