Submission #756894

#	Time	Username	Problem	Language	Result	Execution time	Memory
756894		KN200711	medians (balkan11_medians)	C++14	100 / 100	43 ms	4292 KiB

medians

# include <bits/stdc++.h>
using namespace std;

int ct[200001];
int mn, mx, N;

void upd() {
	while(ct[mn] && mn <= N) mn++;
	while(ct[mx] && mx > 0) mx--;
}

int main() {
	scanf("%d", &N);
	vector<int> arr(N);
	for(int i=0;i<N;i++) scanf("%d", &arr[i]);
	vector<int> as;
	as.clear();
	mn = 1;
	mx = 2 * N - 1;
	for(int i=0;i<N;i++) {
		if(i == 0) {
			as.push_back(arr[i]);
			ct[arr[i]]++;
		}
		else {
			upd();
			if(ct[arr[i]]) {
				if(arr[i] > arr[i - 1]) {
					as.push_back(mx);
					ct[mx] = 1;
					upd();
					as.push_back(mx);
				} else if(arr[i] < arr[i - 1]) {
					as.push_back(mn);
					ct[mn] = 1;
					upd();
					as.push_back(mn);
				} else {
					as.push_back(mn);
					as.push_back(mx);
				}
			} else {
				if(arr[i] > arr[i - 1]) {
					as.push_back(arr[i]);
					as.push_back(mx);
				} else if(arr[i] < arr[i - 1]) {
					as.push_back(arr[i]);
					as.push_back(mn);
				} else {
					as.push_back(mn);
					as.push_back(mx);
				}
			}
			ct[as.back()] = 1;
			ct[as[as.size() - 2]] = 1;
		}
	}
	for(int p=0;p<as.size();p++) printf("%d ", as[p]);
	printf("\n");
	return 0;
}

Compilation message (stderr)

medians.cpp: In function 'int main()':
medians.cpp:58:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   58 |  for(int p=0;p<as.size();p++) printf("%d ", as[p]);
      |              ~^~~~~~~~~~
medians.cpp:13:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |  scanf("%d", &N);
      |  ~~~~~^~~~~~~~~~
medians.cpp:15:28: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |  for(int i=0;i<N;i++) scanf("%d", &arr[i]);
      |                       ~~~~~^~~~~~~~~~~~~~~

• Subtask 1: 65 / 65
• Subtask 2: 35 / 35