Submission #291670

#	Time	Username	Problem	Language	Result	Execution time	Memory
291670		kingfran1907	Popcount (COCI19_popcount)	C++14	0 / 110	1 ms	384 KiB

popcount

#include <bits/stdc++.h>
#define X first
#define Y second
 
using namespace std;
typedef long long llint;
 
const int maxn = 2e5+10;
const int base = 31337;
const int mod = 1e9+7;
const int inf = 0x3f3f3f3f;
const int logo = 20;
const int off = 1 << logo;
const int treesiz = off << 1;

int n, k;
vector< int > v;

void rek(int x) {
	if (x == v.size() - 1) printf("(1<<%d)", v[x]);
	else {
		printf("((1<<%d)+", v[x]);
		rek(x + 1);
		printf(")");
	}
}

int main() {
	scanf("%d%d", &n, &k);

	int log = 0;
	int tren = 1;
	while (tren < n) log++, tren *= 2;

	printf("%d\n", log);
	for (int i = 0; i < log; i++) {
		int ac = (1 << i);
		printf("A=(");

		printf("(A&");
		v.clear();
		for (int j = 0; j < n; j += ac * 2) {
			for (int l = 0; l < ac; l++) {
				if (l + j >= n) break; 
				v.push_back(j + l);
			}
		}
		rek(0);
		printf(")+");

		v.clear();
		for (int j = ac; j < n; j += ac * 2) {
			int l = min(n, j + ac);
			if (l == n) {
				printf("((A&");
				for (int x = j; x < l; x++)
					v.push_back(x);
				rek(0);
				printf(")>>%d)", ac);
			} else printf("((A&((1<<%d)-(1<<%d)))>>%d)", l, j, ac);
			if (j + ac * 2 < n) printf("+");
		}

		printf(")\n");
	}
	return 0;
}

Compilation message (stderr)

popcount.cpp: In function 'void rek(int)':
popcount.cpp:20:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |  if (x == v.size() - 1) printf("(1<<%d)", v[x]);
      |      ~~^~~~~~~~~~~~~~~
popcount.cpp: In function 'int main()':
popcount.cpp:29:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   29 |  scanf("%d%d", &n, &k);
      |  ~~~~~^~~~~~~~~~~~~~~~

• Subtask 1: 0 / 15
• Subtask 2: 0 / 15
• Subtask 3: 0 / 35
• Subtask 4: 0 / 45