oj.uz

Submission #128346

# Submission time Handle Problem Language Result Execution time Memory
128346 2019-07-10T18:53:14 Z Vardanyan Match (CEOI16_match) C++14
100 / 100
 1312 ms 104472 KB 
#include <bits/stdc++.h>
using namespace std;
const int N = 100 * 1000 + 5;
int p[N][30];
string s;
string ans;
void rec(int l, int r) {
	if (l >= r) return;
	if (r - l == 1) {
		ans[l] = '(';
		ans[r] = ')';
		return;
	}
	if (s[l] == s[r]) {
		ans[l] = '(';
		ans[r] = ')';
		rec(l + 1, r - 1);
		return;
	}
	int pos = p[r][s[l] - 'a'+1];
	ans[l] = '(';
	ans[pos] = ')';
	if (r - l <= 1) return;
	rec(l + 1, pos - 1);
	rec(pos + 1, r);
}
long long pw[1000 * 100 + 5];
const int MOD = 1000 * 1000 * 1000 + 7;
map<long long, vector<int> > g[30];
int main() {
	ios_base::sync_with_stdio(false);
	//freopen("7-router.out","w",stdout);
	cin >> s;
	stack<char> st;
	for (int i = 0; i<s.length(); i++) {
		ans += "x";
		if (!st.size()) {
			st.push(s[i]);
			continue;
		}
		else {
			char c = st.top();
			if (c == s[i]) {
				st.pop();
				continue;
			}
			st.push(s[i]);
		}
	}
	if (st.size()) {
		cout << -1 << endl;
		return 0;
	}
	pw[0] = 1;
	for (int i = 1; i <= s.length(); i++) {
		pw[i] = pw[i - 1] * 259;
		pw[i] %= MOD;
	}
	long long hsh = 0;
	map<long long, int> mp;
	map<long long, bool> bl;
	for (int i = 0; i<s.length(); i++) {
		if (!st.size()) {
			st.push(s[i]);
			hsh += (pw[st.size()] * (s[i] - 'a' + 1));
			hsh %= MOD;
			/*int x = mp[hsh];
			if (bl[hsh]) {
				p[i][s[x] - 'a'] = x;
			}*/
			for (int ii = 1; ii <= 26; ii++) {
				for (int j = 0; j < g[ii][hsh].size(); j++) {
					p[i][ii] = max(p[i][ii], g[ii][hsh][j]);
				}
			}
			mp[hsh] = i;
			bl[hsh] = 1;
			g[s[i]-'a'+1][hsh].push_back(i);
			continue;
		}
		char c = st.top();
		if (c == s[i]) {
			hsh -= (pw[st.size()] * (s[i] - 'a' + 1));
			 hsh += ((long long)30*MOD);
			 hsh %= MOD;
			st.pop();
		}
		else {
			st.push(s[i]);
			hsh += (pw[st.size()] * (s[i] - 'a' + 1));
			hsh %= MOD;
		}
		/*int x = mp[hsh];
		if (bl[hsh]) {
			p[i][s[x] - 'a'] = x;
		}*/
		for (int ii = 1; ii <= 26; ii++) {
			for (int j = 0; j < g[ii][hsh].size(); j++) {
				p[i][ii] = max(p[i][ii], g[ii][hsh][j]);
			}
		}
		mp[hsh] = i;
		bl[hsh] = 1;
		g[s[i] - 'a' + 1][hsh].push_back(i);
	}
	/*for (int j = 0; j<s.length(); j++) {
	for (int i = 1; i<=2; i++) cout << p[j][i] << " ";
	cout << endl;
	}*/
	rec(0, s.length() - 1);
	cout << ans << endl;
	return 0;
}

Compilation message

match.cpp: In function 'int main()':
match.cpp:35:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i<s.length(); i++) {
                  ~^~~~~~~~~~~
match.cpp:55:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 1; i <= s.length(); i++) {
                  ~~^~~~~~~~~~~~~
match.cpp:62:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i = 0; i<s.length(); i++) {
                  ~^~~~~~~~~~~
match.cpp:72:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int j = 0; j < g[ii][hsh].size(); j++) {
                     ~~^~~~~~~~~~~~~~~~~~~
match.cpp:98:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for (int j = 0; j < g[ii][hsh].size(); j++) {
                    ~~^~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct

Subtask #2
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 5 ms 1200 KB Output is correct
5 Correct 6 ms 1464 KB Output is correct
6 Correct 4 ms 636 KB Output is correct
7 Correct 7 ms 1528 KB Output is correct

Subtask #3
63.0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 5 ms 1200 KB Output is correct
5 Correct 6 ms 1464 KB Output is correct
6 Correct 4 ms 636 KB Output is correct
7 Correct 7 ms 1528 KB Output is correct
8 Correct 30 ms 5624 KB Output is correct
9 Correct 44 ms 6904 KB Output is correct
10 Correct 42 ms 8332 KB Output is correct
11 Correct 43 ms 8440 KB Output is correct
12 Correct 958 ms 71800 KB Output is correct
13 Correct 1119 ms 77656 KB Output is correct
14 Correct 985 ms 81884 KB Output is correct
15 Correct 616 ms 12028 KB Output is correct
16 Correct 606 ms 11896 KB Output is correct
17 Correct 685 ms 58044 KB Output is correct
18 Correct 493 ms 13496 KB Output is correct
19 Correct 1244 ms 104472 KB Output is correct
20 Correct 784 ms 71672 KB Output is correct
21 Correct 1312 ms 102220 KB Output is correct