제출 #267161

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
267161		ly20	Toys (CEOI18_toy)	C++17	100 / 100	851 ms	4548 KiB

toy

#include <bits/stdc++.h>
using namespace std;
set <int> resp;
vector <int> div1;
set <int> d;
void backt(int at, int tot, int mx) {
	 //printf("%d\n", at);
	//int sq = min((int) sqrt(at) + 10, at);
	if(at == 1) {
		resp.insert(tot);
		return;
	}
	for(int i = 0; i < div1.size(); i++) {
		int dv = div1[i];
		if(dv == 1) continue;
		if(dv > mx) break;
		if(at % dv == 0) {
			backt(at / dv, tot + dv - 1, dv);
		}
	} 
}
int main() {
	int n;
	scanf("%d", &n);
	set <int> :: iterator it;
	int sq1 = min((int) sqrt(n) + 10, n);
	for(int i = 1; i < sq1; i++) {
		if(n % i == 0) {
			d.insert(i);
			d.insert(n / i);
		}
	}
	for(it = d.begin(); it != d.end(); it++) {
		div1.push_back(*it);
	}
	backt(n, 0, n);
	printf("%d\n", resp.size());
	for(it = resp.begin(); it != resp.end(); it++) {
		printf("%d ", *it);
	}
	printf("\n");
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

toy.cpp: In function 'void backt(int, int, int)':
toy.cpp:13:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   13 |  for(int i = 0; i < div1.size(); i++) {
      |                 ~~^~~~~~~~~~~~~
toy.cpp: In function 'int main()':
toy.cpp:37:11: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::set<int>::size_type' {aka 'long unsigned int'} [-Wformat=]
   37 |  printf("%d\n", resp.size());
      |          ~^     ~~~~~~~~~~~
      |           |              |
      |           int            std::set<int>::size_type {aka long unsigned int}
      |          %ld
toy.cpp:24:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   24 |  scanf("%d", &n);
      |  ~~~~~^~~~~~~~~~

• Subtask 1: 19 / 19
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 20 / 20
• Subtask 5: 21 / 21