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>
using namespace std;
typedef long long LL;
const LL MOD = 1000000007;
const int MAXN = 110;
LL check_slow(string s){
vector<int> psums(1,0);
for(int j = 0; j < s.size(); j++){
if(s[j] == '('){
psums.push_back(psums[psums.size() - 1] + 1);
} else {
psums.push_back(psums[psums.size() - 1] - 1);
}
}
int laste = psums.size() - 1;
while(laste > 0 && psums[laste-1] >= psums[psums.size()-1]){
laste--;
}
vector<int> endlists[2 * MAXN];
vector<int> psumlists[2 * MAXN];
int ecuridx[2 * MAXN];
int pcuridx[2 * MAXN];
for(int j = laste; j <= psums.size() - 1; j++){
endlists[MAXN + psums[j]].push_back(j);
ecuridx[MAXN + psums[j]] = 0;
}
for(int j = 0; j <= psums.size() - 1; j++){
psumlists[MAXN + psums[j]].push_back(j);
pcuridx[MAXN + psums[j]] = 0;
}
int a = psums[psums.size() - 1] / 2;
for(int j = 0; j < psums.size(); j++){
if(psums[j] < 0) break;
int need = psums[j] + a;
int idx = ecuridx[MAXN + need];
if(idx < endlists[MAXN + need].size()){
int e = endlists[MAXN + need][idx];
// check if all elements in [j,e] are <=
int idx2 = pcuridx[MAXN + 2 * psums[j] + 1];
if(idx2 < psumlists[MAXN + 2 * psums[j] + 1].size() && psumlists[MAXN + 2 * psums[j] + 1][idx2] <= e){
} else {
return 1;
}
}
if(j >= laste){
ecuridx[MAXN + psums[j]]++;
}
pcuridx[MAXN + psums[j]]++;
}
return 0;
}
LL check(string s){
vector<int> psums(1,0);
for(int j = 0; j < s.size(); j++){
if(s[j] == '('){
psums.push_back(psums[psums.size() - 1] + 1);
} else {
psums.push_back(psums[psums.size() - 1] - 1);
}
}
int laste = psums.size() - 1;
while(laste > 0 && psums[laste - 1] >= psums[psums.size() - 1]){
laste--;
}
int lasts = 0;
while(lasts + 1 < psums.size() && psums[lasts + 1] >= psums[0]){
lasts++;
}
int minv = 0;
int maxv = 0;
int a = psums[psums.size()-1] / 2;
for(int i = 0; i < psums.size(); i++){
if(i <= lasts){
minv = min(minv, max(0,psums[i]));
maxv = max(maxv, psums[i]);
}
while(minv <= maxv && minv * 2 < psums[i]) minv++;
if(i >= laste){
int b = psums[i]-a;
if(b >= minv && b <= maxv) return 1;
}
}
return 0;
}
LL cnt(string s, int idx){
if(idx == s.size()){
return check(s);
}
if(s[idx] != 'x'){
return cnt(s, idx + 1);
}
string s1 = s;
string s2 = s;
s1[idx] = '(';
s2[idx] = ')';
for(int z = idx + 1; z <= s.size(); z++){
if(z == s.size() || s[z] == 'x'){
return (cnt(s1, z) + cnt(s2, z)) % MOD;
}
}
}
int main(){
int n;
string s;
cin >> n >> s;
if(n % 2 == 1){
cout << 0 << '\n';
return 0;
}
cout << cnt(s, 0) << '\n';
}
Compilation message (stderr)
securitygate.cpp: In function 'LL check_slow(std::__cxx11::string)':
securitygate.cpp:9:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int j = 0; j < s.size(); j++){
~~^~~~~~~~~~
securitygate.cpp:24:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int j = laste; j <= psums.size() - 1; j++){
~~^~~~~~~~~~~~~~~~~~~
securitygate.cpp:28:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int j = 0; j <= psums.size() - 1; j++){
~~^~~~~~~~~~~~~~~~~~~
securitygate.cpp:33:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int j = 0; j < psums.size(); j++){
~~^~~~~~~~~~~~~~
securitygate.cpp:37:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
if(idx < endlists[MAXN + need].size()){
~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
securitygate.cpp:41:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
if(idx2 < psumlists[MAXN + 2 * psums[j] + 1].size() && psumlists[MAXN + 2 * psums[j] + 1][idx2] <= e){
~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
securitygate.cpp: In function 'LL check(std::__cxx11::string)':
securitygate.cpp:56:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int j = 0; j < s.size(); j++){
~~^~~~~~~~~~
securitygate.cpp:68:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
while(lasts + 1 < psums.size() && psums[lasts + 1] >= psums[0]){
~~~~~~~~~~^~~~~~~~~~~~~~
securitygate.cpp:74:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i = 0; i < psums.size(); i++){
~~^~~~~~~~~~~~~~
securitygate.cpp: In function 'LL cnt(std::__cxx11::string, int)':
securitygate.cpp:89:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
if(idx == s.size()){
~~~~^~~~~~~~~~~
securitygate.cpp:99:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int z = idx + 1; z <= s.size(); z++){
~~^~~~~~~~~~~
securitygate.cpp:100:8: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
if(z == s.size() || s[z] == 'x'){
~~^~~~~~~~~~~
securitygate.cpp:104:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
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