Submission #423713

#	Time	Username	Problem	Language	Result	Execution time	Memory
423713		egekabas	parentrises (BOI18_parentrises)	C++14	50 / 100	59 ms	7276 KiB

parentrises

#include <bits/stdc++.h>
#define all(x) (x).begin(), (x).end()
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<ll, ll> pll;
typedef pair<ull, ull> pull;
typedef pair<int, int> pii;
typedef pair<ld, ld> pld;
void solve1(){
    string s;
    cin >> s;
    int n = s.size();
    int cur = 0;
    int mini = 0;
    for(int i = 0; i < n; ++i){
        if(s[i] == '(')
            cur++;
        else
            cur--;
        mini = min(mini, cur);
    }
    vector<int> ans(n);
    mini *= -1;
    for(int i = 0; i < n; ++i){
        if(mini > 0 && s[i] == '('){
            ans[i] = 1;
            --mini;
            ++cur;
        }
    }
    if(mini > 0){
        cout << "impossible\n";
        return;
    }
    for(int i = n-1; i >= 0; --i){
        if(s[i] == '(')
            continue;
            
        if(cur > 0){
            ans[i] = 1;
            --cur;
        }
    }
    if(cur > 0){
        cout << "impossible\n";
        return;
    }
    cur = 0;
    for(int i = 0; i < n; ++i){
        if(s[i] == '(')
            cur++;
        else
            cur--;
        if(ans[i]){
            if(s[i] == '(')
                cur++;
            else
                cur--;    
        }
        if(cur < 0){
            cout << "impossible\n";
            return;
        }
    }
    int val[2] = {0, 0};
    char c[3] = {'R', 'B', 'G'};
    for(int i = 0; i < n; ++i){
        //cout << '\n' << val[0] << ' ' << val[1] << '\n';
        if(ans[i]){
            cout << c[2];
            if(s[i] == '('){
                ++val[0];
                ++val[1];
            }
            else{
                --val[0];
                --val[1];
            }
        }
        else{
            if(s[i] == '('){
                if(val[0] < val[1]){
                    ++val[0];
                    cout << c[0];
                }
                else{
                    ++val[1];
                    cout << c[1];
                }
            }
            else{
                if(val[0] > val[1]){
                    --val[0];
                    cout << c[0];
                }
                else{
                    --val[1];
                    cout << c[1];
                }
            }
        }
    }
    cout << '\n';
}
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    
    //freopen("in.txt", "r", stdin);
    //freopen("out.txt", "w", stdout);

    int p;
    cin >> p;
    if(p == 1){
        int t;
        cin >> t;
        while(t--)
            solve1();
    }
}

• Subtask 1: 5 / 5
• Subtask 2: 11 / 11
• Subtask 3: 6 / 6
• Subtask 4: 28 / 28
• Subtask 5: 0 / 6
• Subtask 6: 0 / 16
• Subtask 7: 0 / 28