Submission #140855

#	Time	Username	Problem	Language	Result	Execution time	Memory
140855		shafinalam	Difference (POI11_roz)	C++14	90 / 100	702 ms	16144 KiB

roz

#include <bits/stdc++.h>

using namespace std;
#define ff first
#define ss second
const int mxn = 1e6+5;
typedef pair<int,int>pii;
#define  input freopen("in.txt","r",stdin)
#define  output freopen("out.txt","w",stdout)
#define  all(v) v.begin(), v.end()
vector<pii>arr[30];
pii tmp[mxn];

int main()
{
	//input;
	//output;

	int n;
	scanf("%d", &n);
	char ch;
	
	for(int i = 0; i < n; i++)
	{
		scanf(" %c", &ch);
		arr[ch-'a'].push_back(make_pair(i, ch-'a'));
	}
	int ans = -1;
	for(int i = 0; i < 26; i++)
	{
		for(int r = 0; r < 26; r++)
		{
			//if(i==r) continue;
			merge(all(arr[i]), all(arr[r]), tmp);
			int k = arr[i].size()+arr[r].size();
			int sum = 0, best = -(1<<30);
			for(int j = 0; j < k; j++)
			{
				if(tmp[j].ss==i)
				{
					sum++;
					best++;
				}
				else
				{
					best = sum-1;
					sum = max(sum-1, 0);
				}
				ans = max(ans, best);
			}
		}
	}
	printf("%d\n", ans);
	return 0;
}

Compilation message (stderr)

roz.cpp: In function 'int main()':
roz.cpp:20:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
roz.cpp:25:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf(" %c", &ch);
   ~~~~~^~~~~~~~~~~~

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