Submission #742153

#	Time	Username	Problem	Language	Result	Execution time	Memory
742153		chanhchuong123	Global Warming (CEOI18_glo)	C++14	100 / 100	57 ms	4284 KiB

glo

#include <bits/stdc++.h>
using namespace std;
#define task ""
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define FOR(i, a, b) for (int i = (a), _b = (b); i <= _b; ++i)
#define FORD(i, a, b) for (int i = (b), _a = (a); i >= _a; --i)

template <typename T1, typename T2> bool minimize(T1 &a, T2 b) {
	if (a > b) {a = b; return true;} return false;
}
template <typename T1, typename T2> bool maximize(T1 &a, T2 b) {
	if (a < b) {a = b; return true;} return false;
}

const int dx[] = {-1, 0, 0, +1};
const int dy[] = {0, -1, +1, 0};

const int MAX = 200200;
int n, x;
int a[MAX];
int L[MAX];
int ans = 0;
vector<int> dp;

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);

	if (fopen(task".inp", "r")) {
		freopen(task".inp", "r", stdin);
		freopen(task".out", "w", stdout);
	}

	cin >> n >> x;
	for (int i = 1; i <= n; ++i) cin >> a[i];

	dp.clear();
	for (int i = 1; i <= n; ++i) {
        int pos = lower_bound(all(dp), a[i]) - dp.begin();
        if (pos == dp.size()) dp.push_back(a[i]);
        else dp[pos] = a[i]; L[i] = pos + 1;
        maximize(ans, L[i]);
	}

	dp.clear();
	for (int i = n; i >= 1; --i) {
        int POS = lower_bound(all(dp), -a[i] + x) - dp.begin();
        maximize(ans, L[i] + POS);

        int pos = lower_bound(all(dp), -a[i]) - dp.begin();
        if (pos == dp.size()) dp.push_back(-a[i]);
        else dp[pos] = -a[i];
	}

	cout << ans;
	return 0;
}

Compilation message (stderr)

glo.cpp: In function 'int main()':
glo.cpp:43:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |         if (pos == dp.size()) dp.push_back(a[i]);
      |             ~~~~^~~~~~~~~~~~
glo.cpp:44:9: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
   44 |         else dp[pos] = a[i]; L[i] = pos + 1;
      |         ^~~~
glo.cpp:44:30: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'else'
   44 |         else dp[pos] = a[i]; L[i] = pos + 1;
      |                              ^
glo.cpp:54:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |         if (pos == dp.size()) dp.push_back(-a[i]);
      |             ~~~~^~~~~~~~~~~~
glo.cpp:33:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   33 |   freopen(task".inp", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
glo.cpp:34:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   34 |   freopen(task".out", "w", stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 13 / 13
• Subtask 4: 10 / 10
• Subtask 5: 20 / 20
• Subtask 6: 17 / 17
• Subtask 7: 25 / 25