Submission #346845

#	Time	Username	Problem	Language	Result	Execution time	Memory
346845		arnold518	MP3 Player (CEOI10_mp3player)	C++14	40 / 100	1094 ms	1516 KiB

mp3player

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

const int MAXN = 1e5;

int N, Vmax, V2;
pii A[MAXN+10];
int B[MAXN+10];

int main()
{
	scanf("%d%d%d", &N, &Vmax, &V2); N--;
	int t;
	scanf(" %*c%d", &t);
	for(int i=1; i<=N; i++)
	{
		int p; char q;
		scanf(" %c%d", &q, &p);
		if(q=='+') A[i]={p-t, i};
		else A[i]={p-t, -i};
		t=p;
	}
	sort(A+1, A+N+1);

	int ans1=A[1].first-1, ans2=V2;
	A[N+1].first=2147483647;
	for(int i=1; i<=N; i++)
	{
		if(A[i].second>0) B[A[i].second]=1;
		else B[-A[i].second]=-1;
		if(A[i].first==A[i+1].first) continue;

		int l=V2, r=V2;
		bool flag=true;
		for(int j=N; j>=1; j--)
		{
			if(B[j]==0) continue;
			if(B[j]==-1)
			{
				if(l!=0) l++;
				if(r!=Vmax) r++;
			}
			if(B[j]==1)
			{
				if(l!=0) l--;
				if(r!=Vmax) r--;
			}
			if(l>r)
			{
				flag=false;
				break;
			}
		}
		if(flag)
		{
			ans1=A[i+1].first-1;
			ans2=r;
		}
	}
	if(ans1==2147483646) printf("infinity\n");
	else printf("%d %d\n", ans1, ans2);
}

Compilation message (stderr)

mp3player.cpp: In function 'int main()':
mp3player.cpp:16:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   16 |  scanf("%d%d%d", &N, &Vmax, &V2); N--;
      |  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
mp3player.cpp:18:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   18 |  scanf(" %*c%d", &t);
      |  ~~~~~^~~~~~~~~~~~~~
mp3player.cpp:22:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   22 |   scanf(" %c%d", &q, &p);
      |   ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 0 / 10
• Subtask 6: 0 / 10
• Subtask 7: 0 / 10
• Subtask 8: 0 / 10
• Subtask 9: 0 / 10
• Subtask 10: 0 / 10