Submission #67297

#	Time	Username	Problem	Language	Result	Execution time	Memory
67297		ekrem	DEL13 (info1cup18_del13)	C++98	0 / 100	1076 ms	14676 KiB

del13

#include <bits/stdc++.h>
#define st first
#define nd second
#define mp make_pair
#define pb push_back
#define N 1000005
using namespace std;

int t, n, q, m, b[N], a[N], dp[3][N];

bool f(int sol, int ind){
	int &r = dp[sol][ind];
	if(r != -1)
		return r;
	if(ind > m and sol == 0)
		return 1;
	if(sol > a[ind])
		return 0;
	int yeni = a[ind] - sol;
	bool don = 0;
	int md = a[ind]%2;
	if(a[ind] > 0 and !md)
		md = 2;
	if(sol == md)
		don |= f(0, ind + 1);
	// cout << a[ind] << " -> " << sol  << " = " << yeni << " , " << md<< endl;
	for(int i = 1; i <= 2; i++){
		if(yeni >= i and (yeni - i)%2 == 0)
			don |= f(i, ind + 1);
	}
	return r = don;
}

int main() {
	// freopen("in.txt", "r", stdin);
	// freopen("out.txt", "w", stdout);
	scanf("%d",&t);
	while(t--){
		memset(dp, -1, sizeof dp);
		m = 0;
		int top = 0;
		scanf("%d %d",&n ,&q);
		for(int i = 1; i <= q; i++)
			scanf("%d", b + i);
		b[q + 1] = n + 1;
		for(int i = 1; i <= q + 1; i++)
			top += a[++m] = b[i] - b[i - 1] - 1;
		// for(int i = 1; i <= m; i++)cout << a[i] << " ";cout << endl;
		if(!f(0, 1))
			printf("-1\n");
		else
			printf("%d\n",top/2);
	}
	return 0;
}

Compilation message (stderr)

del13.cpp: In function 'bool f(int, int)':
del13.cpp:31:11: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
  return r = don;
         ~~^~~~~
del13.cpp: In function 'int main()':
del13.cpp:37:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&t);
  ~~~~~^~~~~~~~~
del13.cpp:42:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d",&n ,&q);
   ~~~~~^~~~~~~~~~~~~~~~
del13.cpp:44:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d", b + i);
    ~~~~~^~~~~~~~~~~~~

• Subtask 1: 0 / 15
• Subtask 2: 0 / 15
• Subtask 3: 0 / 15
• Subtask 4: 0 / 25
• Subtask 5: 0 / 30