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Submission #250571

# Submission time Handle Problem Language Result Execution time Memory
250571 2020-07-18T11:49:08 Z Osama_Alkhodairy Match (CEOI16_match) C++17
100 / 100
 167 ms 14580 KB 
#include <bits/stdc++.h>
using namespace std;
#define finish(x) return cout << x << endl, 0
#define ll long long

int n, base = 3271, mod = 1e9 + 7;
string s;
map <int, vector <int> > mp;

int powlog(int a, int b){
    if(b == 0) return 1;
    int ret = powlog(a, b / 2);
    if(b % 2) return 1LL * ret * ret % mod * a % mod;
    return 1LL * ret * ret % mod;
}
void add_char(int &cur_hash, char c){
    cur_hash = (1LL * cur_hash * base + c - 'a' + 1) % mod;
}
void del_char(int &cur_hash, int c){
    cur_hash -= c - 'a' + 1;
    if(cur_hash < 0) cur_hash += mod;
    cur_hash = 1LL * cur_hash * powlog(base, mod - 2) % mod;
}
int ub(vector <int> &cur, int idx){
    return *--upper_bound(cur.begin(), cur.end(), idx);
}
int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> s;
    n = s.size();
    s = ';' + s;
    string cur;
    vector <int> hash(n + 1);
    int cur_hash = 0;
    for(int i = 1 ; i <= n ; i++){
        if(cur.size() > 0 && s[i] == cur.back()){
            del_char(cur_hash, s[i]);
            cur.pop_back();
        }
        else{
            add_char(cur_hash, s[i]);
            cur += s[i];
        }
        hash[i] = cur_hash;
    }
    if(cur.size() > 0) finish(-1);
    for(int i = 1 ; i <= n ; i++){
        int h = hash[i];
        add_char(h, s[i]);
        mp[h].push_back(i);
    }
    string ans(n + 1, ';');
    set <int> f;
    f.insert(n + 1);
    int l = 1;
    while(l <= n){
        if(f.count(l)){
            l++;
            continue;
        }
        int t = *f.upper_bound(l) - 1;
        int h = hash[l - 1];
        add_char(h, s[l]);
        int r = ub(mp[h], t);
        assert(l < r);
        ans[l] = '(';
        ans[r] = ')';
        f.insert(l);
        f.insert(r);
    }
    cout << ans.substr(1) << endl;
}

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct

Subtask #2
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 512 KB Output is correct
6 Correct 2 ms 384 KB Output is correct
7 Correct 2 ms 512 KB Output is correct

Subtask #3
63.0 / 63.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 512 KB Output is correct
6 Correct 2 ms 384 KB Output is correct
7 Correct 2 ms 512 KB Output is correct
8 Correct 6 ms 1152 KB Output is correct
9 Correct 6 ms 1280 KB Output is correct
10 Correct 7 ms 1408 KB Output is correct
11 Correct 7 ms 1408 KB Output is correct
12 Correct 74 ms 9976 KB Output is correct
13 Correct 82 ms 10744 KB Output is correct
14 Correct 90 ms 11380 KB Output is correct
15 Correct 62 ms 5212 KB Output is correct
16 Correct 62 ms 5236 KB Output is correct
17 Correct 93 ms 9716 KB Output is correct
18 Correct 66 ms 5876 KB Output is correct
19 Correct 145 ms 14580 KB Output is correct
20 Correct 84 ms 9848 KB Output is correct
21 Correct 167 ms 14580 KB Output is correct