Submission #317104

#	Time	Username	Problem	Language	Result	Execution time	Memory
317104		Kevin_Zhang_TW	DEL13 (info1cup18_del13)	C++17	40 / 100	14 ms	1408 KiB

del13

#include<bits/stdc++.h>
#define pb emplace_back
#define AI(i) begin(i), end(i)
using namespace std;
using ll = long long;
#ifdef KEV
#define DE(args...) kout("[ " + string(#args) + " ] : ", args)
void kout() { cerr << endl; }
template<class T, class ...U>
void kout(T a, U ...b) { cerr << a << ' ', kout(b...); }
void debug(auto L, auto R) { while (L != R) cerr << *L << " \n"[next(L) == R], ++L; }
#else
#define debug(...) 0
#define DE(...) 0
#endif
const int MAX_N = 300010, inf = 1e7;
int len, m, p[MAX_N], dp_max[MAX_N], dp_min[MAX_N], dis[MAX_N];
bool valid() {
	DE(len, m);
	if ((len ^ m++) & 1)
		return false;
	for (int i = 1;i <= m;++i)
		dis[i] = p[i] - p[i-1] - 1;

	dp_max[0] = dp_min[0] = 0;
	DE(len, m);
	debug(dis+1, dis+m+1);
	for (int i = 1;i <= m;++i) {
		int u = dp_max[i-1], d = dp_min[i-1], h = dis[i];
		if (d > h)
			return false;

		if (h == 0) {
			dp_max[i] = dp_min[i] = 0;
			continue;
		}
		if (u == 0) {
			dp_max[i] = h, dp_min[i] = h&1 ? 1 : 2;
			continue;
		}
		dp_max[i] = h - d;
		if (h % 2 == d % 2) 
			dp_min[i] = 0;
		else 
			dp_min[i] = 1;

		if (dp_max[i] < dp_min[i])
			return false;
	}
	for (int i = 1;i <= m;++i) 
		DE(i, dp_min[i], dp_max[i]);
	if (dp_min[m] != 0)
		return false;
	int need = (len - (m-1)) / 2;
	cout << need  << '\n';
	for (int i = 1;i <= need ;++i)
		cout << i << " \n"[i==need];
	return true;
}
void solve() {
	cin >> len >> m;
	for (int i = 1;i <= m;++i)
		cin >> p[i];
	p[m+1] = len+1;
	if (!valid()) 
		return cout << -1 << '\n', void();
}
int32_t main() {
	ios_base::sync_with_stdio(0), cin.tie(0);
	int T;
	cin >> T;
	while (T--)
		solve();
}

Compilation message (stderr)

del13.cpp: In function 'bool valid()':
del13.cpp:14:17: warning: statement has no effect [-Wunused-value]
   14 | #define DE(...) 0
      |                 ^
del13.cpp:19:2: note: in expansion of macro 'DE'
   19 |  DE(len, m);
      |  ^~
del13.cpp:14:17: warning: statement has no effect [-Wunused-value]
   14 | #define DE(...) 0
      |                 ^
del13.cpp:26:2: note: in expansion of macro 'DE'
   26 |  DE(len, m);
      |  ^~
del13.cpp:13:20: warning: statement has no effect [-Wunused-value]
   13 | #define debug(...) 0
      |                    ^
del13.cpp:27:2: note: in expansion of macro 'debug'
   27 |  debug(dis+1, dis+m+1);
      |  ^~~~~
del13.cpp:14:17: warning: statement has no effect [-Wunused-value]
   14 | #define DE(...) 0
      |                 ^
del13.cpp:51:3: note: in expansion of macro 'DE'
   51 |   DE(i, dp_min[i], dp_max[i]);
      |   ^~

• Subtask 1: 6 / 15
• Subtask 2: 6 / 15
• Subtask 3: 6 / 15
• Subtask 4: 10 / 25
• Subtask 5: 12 / 30