제출 #330922

#제출 시각아이디문제언어결과실행 시간메모리
330922ZwariowanyMarcinXOR (IZhO12_xor)C++14
100 / 100
167 ms23532 KiB
#include <bits/stdc++.h> #define pb push_back #define fi first #define se second #define sz(x) (int)x.size() using ll = long long; using namespace std; const int M = 8000000; int n, q, a, b, cnt, to[M][2], mn[M]; pair<int, int> res; void add(int pos, int x) { int v = 0; for (int i = 30; 0 <= i; --i) { int b = (x >> i & 1); if (!to[v][b]) to[v][b] = ++cnt, mn[cnt] = 1 << 30; v = to[v][b]; mn[v] = min(mn[v], pos); } } int query(int x) { int v = 0, res = 1 << 30; for (int i = 30; 0 <= i; --i) { int b = (x >> i & 1); if (q >> i & 1) v = to[v][!b]; else { res = min(res, mn[to[v][!b]]); v = to[v][b]; } if (!v) return res; } res = min(res, mn[v]); return res; } int main() { //~ memset(mn, 0x3f, sizeof mn); mn[0] = 1 << 30; scanf("%d%d", &n, &q); add(0, 0); for (int i = 1; i <= n; ++i) { scanf("%d", &a); b ^= a; int l = query(b); res = max(res, {i - l, -l}); add(i, b); } printf("%d %d\n", -res.second + 1, res.first); return 0; }

컴파일 시 표준 에러 (stderr) 메시지

xor.cpp: In function 'int main()':
xor.cpp:44:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   44 |  scanf("%d%d", &n, &q);
      |  ~~~~~^~~~~~~~~~~~~~~~
xor.cpp:47:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   47 |   scanf("%d", &a);
      |   ~~~~~^~~~~~~~~~
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