Submission #442400

#	Time	Username	Problem	Language	Result	Execution time	Memory
442400		koioi.org-koosaga	Counterspells (CPSPC17_counterspells)	C++17	60 / 100	1084 ms	3780 KiB

Main

#include <bits/stdc++.h>
#define sz(v) ((int)(v).size())
#define all(v) (v).begin(), (v).end()
using namespace std;
using lint = long long;
using pi = pair<int, int>;
const int MAXN = 200005;
const int mod = 1e9 + 7;
 
int n, p[MAXN], dep[MAXN];
int val[MAXN], cnt[MAXN];
 
int main(){
	scanf("%d",&n);
	p[0] = -1;
	for(int i = 1; i <= n; i++){
		scanf("%d",&p[i]);
		dep[i] = dep[p[i]] + 1;
		if(dep[i] % 2) cnt[i]++;
	}
	for(int i = 1; i <= n; i++){
		val[i] = dep[i] % 2;
		if(dep[i] % 2) cnt[p[i]]++;
		else cnt[p[i]]--;
		int ans = 0;
		for(int j = p[i]; j != -1; j = p[j]){
			int cur = val[j];
			int nxt = (cnt[j] > 0);
			if(cur != nxt){
				val[j] ^= 1;
				if(~p[j]){
					if(val[j] == 1) cnt[p[j]]++;
					else cnt[p[j]]--;
				}
				ans++;
			}
			else break;
		}
		printf("%d\n", ans);
	}
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:14:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |  scanf("%d",&n);
      |  ~~~~~^~~~~~~~~
Main.cpp:17:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |   scanf("%d",&p[i]);
      |   ~~~~~^~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 0 / 20
• Subtask 4: 20 / 20
• Subtask 5: 0 / 20