Submission #964124

#	Time	Username	Problem	Language	Result	Execution time	Memory
964124		guechotjrhh	Safety (NOI18_safety)	C++14	9 / 100	35 ms	2916 KiB

safety

#include<stdio.h>
#include<vector>
#pragma warning (disable:4996)
using namespace std;

#include<algorithm>
#define ll long long
ll ab(ll n) { return n > 0 ? n : -n; }
int sz = 5001, inf = 1e9;
long long func(int n, int h, vector<int> s) {
	if (h == 0) {
		sort(s.begin(), s.end());
		ll r = 0;
		for (int i = 0; i < n; i++) r += ab(s[i] - s[n / 2]);
		return r;
	}

	vector<int> le = { 0 }, ri = { inf };
	ll val = 0;
	for (int i = 0; i < n; i++) {
		for (int j = 0; j < ri.size(); j++) {
			ri[j] += h; if (ri[j] > 1e9) ri[j] = 1e9;
		}
		for (int j = 0; j < le.size(); j++) {
			le[j] -= h; if (le[j] < 0)le[j] = 0;
		}
		
		vector<int> nle, nri;
		ll nval;
		if (s[i] <= ri[0] && s[i] >= le[0]) {
			nval = val;
			nle = { s[i] };
			for (int j : le) if (j < s[i]) nle.push_back(j);
			nri = { s[i] };
			for (int j : ri) if (j > s[i]) nri.push_back(j);
		}
		else if (s[i] > ri[0]) {
			nval = val + s[i] - ri[0];
			nle = { ri[0] };
			for (int j : le) if (j < ri[0]) nle.push_back(j);
			nri = { ri[1] };
			for (int j = 2; j < ri.size();j++) nri.push_back(ri[j]);
		}
		else {
			nval = val + le[0] - s[i];
			nle = { le[1] };
			for (int j = 2; j < le.size(); j++) nle.push_back(le[j]);
			nri = { le[0] };
			for (int j : ri) if (j > le[0]) nri.push_back(j);
		}
		val = nval;
		ri = nri;
		le = nle;
	}
	return val;

	vector<ll> dp(sz,0);

	int mi = 0;

	for (int i = 0; i < n; i++) {
		vector<ll> ndp(sz);
		for (int j = 0; j < sz; j++) {
			ndp[j] = ab(j - s[i]);
			int d = max(0, j - h), u = min(sz - 1, j + h);
			if (d <= mi && u >= mi) ndp[j] += dp[mi];
			if (d > mi) ndp[j] += dp[d];
			if (u < mi) ndp[j] += dp[u];
			//ll mn = 1e18;
			//for (int k = max(0, j - h); k <= min(sz-1, j + h); k++) mn = min(mn, dp[k]);
			//ndp[j] += mn;
		}
		for (int j : dp) printf("%d ", j); printf("\n");
		dp = ndp;

		mi = 0;
		for (int i = 0; i < sz; i++) if (dp[i] < dp[mi]) mi = i;
	}

	ll mn = 1e18;
	for (int i = 0; i < sz; i++) mn = min(mn, dp[i]);

	return mn;
}

int main() {
	int N, H;
	scanf("%d%d", &N, &H);
	vector<int> S(N);
	for (int i = 0; i < N; i++) scanf("%d", &S[i]);

	long long ans = func(N, H, move(S));

	printf("%lld\n", ans);
}

Compilation message (stderr)

safety.cpp:3: warning: ignoring '#pragma warning ' [-Wunknown-pragmas]
    3 | #pragma warning (disable:4996)
      | 
safety.cpp: In function 'long long int func(int, int, std::vector<int>)':
safety.cpp:21:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |   for (int j = 0; j < ri.size(); j++) {
      |                   ~~^~~~~~~~~~~
safety.cpp:24:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |   for (int j = 0; j < le.size(); j++) {
      |                   ~~^~~~~~~~~~~
safety.cpp:42:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |    for (int j = 2; j < ri.size();j++) nri.push_back(ri[j]);
      |                    ~~^~~~~~~~~~~
safety.cpp:47:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |    for (int j = 2; j < le.size(); j++) nle.push_back(le[j]);
      |                    ~~^~~~~~~~~~~
safety.cpp:73:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   73 |   for (int j : dp) printf("%d ", j); printf("\n");
      |   ^~~
safety.cpp:73:38: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   73 |   for (int j : dp) printf("%d ", j); printf("\n");
      |                                      ^~~~~~
safety.cpp: In function 'int main()':
safety.cpp:88:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   88 |  scanf("%d%d", &N, &H);
      |  ~~~~~^~~~~~~~~~~~~~~~
safety.cpp:90:35: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   90 |  for (int i = 0; i < N; i++) scanf("%d", &S[i]);
      |                              ~~~~~^~~~~~~~~~~~~

• Subtask 1: 0 / 3
• Subtask 2: 4 / 4
• Subtask 3: 0 / 9
• Subtask 4: 5 / 5
• Subtask 5: 0 / 6
• Subtask 6: 0 / 11
• Subtask 7: 0 / 11
• Subtask 8: 0 / 22
• Subtask 9: 0 / 29