Submission #30818

#	Time	Username	Problem	Language	Result	Execution time	Memory
30818		zscoder	Match (CEOI16_match)	C++14	37 / 100	2000 ms	31392 KiB

match

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
 
using namespace std;
using namespace __gnu_pbds;
 
#define fi first
#define se second
#define mp make_pair
#define pb push_back
#define fbo find_by_order
#define ook order_of_key
 
typedef long long ll;
typedef pair<int,ll> ii;
typedef vector<int> vi;
typedef long double ld; 
typedef tree<ll, null_type, less<ll>, rb_tree_tag, tree_order_statistics_node_update> pbds;
typedef set<ll>::iterator sit;
typedef map<ll,ll>::iterator mit;
 
bool err;
string s;

void solve(int l, int r)
{
	if(l>r) return ;
	stack<char> S;
	string ans;
	int idx=-1;
	if(s[l]==s[r])
	{
		solve(l+1,r-1);
		if(err) return ;
		s[l]='('; s[r]=')';
		return ;
	}
	for(int i = r; i > l; i--)
	{
		if(!S.empty()&&S.top()==s[i])
		{
			S.pop();
		}
		else
		{
			S.push(s[i]);
		}
		if(s[l]==s[i-1]&&S.empty())
		{
			idx=i;
			break;
		}
	}
	if(idx<=l)
	{
		err=true;
		return ;
	}
	solve(l+1,idx-2);
	solve(idx,r);
	s[l]='('; s[idx-1]=')';
}
char a[100011];
int main()
{
	scanf("%s", a);
	int idx=0;
	while(a[idx]!='\0')
	{
		s+=a[idx];
		idx++;
	}
	solve(0,int(s.length())-1);
	if(err) cout<<-1<<'\n';
	else cout<<s<<'\n';	
}

Compilation message (stderr)

match.cpp: In function 'int main()':
match.cpp:67:16: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%s", a);
                ^

• Subtask 1: 10 / 10
• Subtask 2: 27 / 27
• Subtask 3: 0 / 63