struct precalc
{
int p[924];
constexpr precalc()
{
int l = 0;
for (int i = 0; i < 1 << 12; ++i)
if (__builtin_popcount(i) == 6)
p[l++] = i;
}
};
constexpr precalc z;
int encode(int n, int x, int y) { return __builtin_ctz(z.p[x] ^ z.p[y]) + 1; }
struct precalc
{
int p[924];
constexpr precalc()
{
int l = 0;
for (int i = 0; i < 1 << 12; ++i)
if (__builtin_popcount(i) == 6)
p[l++] = i;
}
};
constexpr precalc z;
int decode(int n, int q, int h) { return z.p[q] & (1 << (h - 1)); }
Compilation message
encoder.cpp: In constructor 'constexpr precalc::precalc()':
encoder.cpp:10:5: error: member 'precalc::p' must be initialized by mem-initializer in 'constexpr' constructor
10 | }
| ^
encoder.cpp:3:9: note: declared here
3 | int p[924];
| ^
encoder.cpp: At global scope:
encoder.cpp:13:19: error: 'constexpr precalc::precalc()' called in a constant expression
13 | constexpr precalc z;
| ^
encoder.cpp:4:15: note: 'constexpr precalc::precalc()' declared here
4 | constexpr precalc()
| ^~~~~~~
decoder.cpp: In constructor 'constexpr precalc::precalc()':
decoder.cpp:10:5: error: member 'precalc::p' must be initialized by mem-initializer in 'constexpr' constructor
10 | }
| ^
decoder.cpp:3:9: note: declared here
3 | int p[924];
| ^
decoder.cpp: At global scope:
decoder.cpp:13:19: error: 'constexpr precalc::precalc()' called in a constant expression
13 | constexpr precalc z;
| ^
decoder.cpp:4:15: note: 'constexpr precalc::precalc()' declared here
4 | constexpr precalc()
| ^~~~~~~
