Submission #43022

#	Time	Username	Problem	Language	Result	Execution time	Memory
43022		milmillin	Editor (BOI15_edi)	C++14	15 / 100	83 ms	2516 KiB

edi

#include <cstdio>
#include <vector>
#include <algorithm>

using namespace std;

vector<int> undo;
vector<int> states;

bool isActive() {
	return undo.size()%2==0;
}

int main () {
	int n;
	scanf("%d", &n);
	states.push_back(0);
	int x;
	bool tmp;
	for (int i = 0; i < n; i++) {
		scanf("%d", &x);
		if (x > 0) {
			if (!isActive()) states.pop_back();
			undo.clear();
			states.push_back(x);
		} else {
			if (states.back() != 0) {
				x = -x;
				tmp = (!isActive() && (undo.empty() || x <= undo.front()));
				while (!undo.empty() && undo.back() >= x) undo.pop_back();
				if (tmp) states.pop_back();
				undo.push_back(x);
			}
		}
		//for (auto j : states) printf("%d ", j);
		//printf("\n");
		//for (auto j : undo) printf("%d ", j);
		//printf("\n");
		printf("%d\n", (isActive())?states.back():states[states.size()-2]);
	}
	return 0;
}

Compilation message (stderr)

edi.cpp: In function 'int main()':
edi.cpp:16:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
                 ^
edi.cpp:21:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d", &x);
                  ^

• Subtask 1: 0 / 20
• Subtask 2: 15 / 15
• Subtask 3: 0 / 28
• Subtask 4: 0 / 37