# | Time | Username | Problem | Language | Result | Execution time | Memory |
---|---|---|---|---|---|---|---|
365450 | lookcook | parentrises (BOI18_parentrises) | Java | 0 ms | 0 KiB |
This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#define int long long
using namespace std;
const int maxn = 1000005;
char res[maxn];
signed main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
int p, t;
cin >> p >> t;
if (p == 1) {
while (t--) {
string s;
cin >> s;
bool ok = true;
bool turn = true;
int sr = 0;
int sb = 0;
for (int i = 0; i < s.length(); i++) {
if (s[i] == '(') {
res[i] = 'G';
sr++;
sb++;
} else {
if (turn) {
res[i] = 'R';
sr--;
} else {
res[i] = 'B';
sb--;
}
turn = !turn;
}
if (sr < 0 || sb < 0) ok = false;
}
if (sb>sr) {
for (int i = s.length()-1; i >= 0; i--) {
if (s[i] == '(') {
res[i] = 'R';
break;
}
if (s[i] == ')' && res[i] == 'R') {
res[i] = 'G';
break;
}
}
}
sr = 0;
sb = 0;
for (int i = 0; i < s.length(); i++) {
if (s[i] == ')') {
if (res[i] == 'G') {
sr--;
sb--;
}
if (res[i] == 'R') sr--;
if (res[i] == 'B') sb--;
} else {
if (res[i] == 'G') {
sr++;
sb++;
}
if (res[i] == 'R') sr++;
if (res[i] == 'B') sb++;
}
if (sr < 0 || sb < 0) ok = false;
}
for (int i = s.length()-1; i >= 0; i--) {
if (s[i] == '(' && res[i] == 'G') {
if (sr>=sb && sr>0) { // maybe swap order?
sr--;
res[i] = 'B';
} else if (sb > 0) {
sb--;
res[i] = 'R';
}
}
if (s[i] == ')') {
if (res[i] == 'R' && sb>0) {
res[i] = 'G';
sb--;
} else if (res[i] == 'B' && sr>0) {
res[i] = 'G';
sr--;
}
}
}
sr = 0;
sb = 0;
for (int i = 0; i < s.length(); i++) {
if (s[i] == ')') {
if (res[i] == 'G') {
sr--;
sb--;
}
if (res[i] == 'R') sr--;
if (res[i] == 'B') sb--;
} else {
if (res[i] == 'G') {
sr++;
sb++;
}
if (res[i] == 'R') sr++;
if (res[i] == 'B') sb++;
}
if (sr < 0 || sb < 0) ok = false;
}
if (ok && sr==0&&sb==0) {
for (int i = 0; i < s.length(); i++) cout << res[i];
cout << '\n';
} else {
cout << "impossible\n";
}
}
}
}