oj.uz

Submission #74113

# Submission time Handle Problem Language Result Execution time Memory
74113 2018-08-30T06:28:48 Z zscoder parentrises (BOI18_parentrises) C++17
100 / 100
 52 ms 6984 KB 
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
 
using namespace std;
using namespace __gnu_pbds;
 
#define fi first
#define se second
#define mp make_pair
#define pb push_back
 
typedef long long ll;
typedef pair<int,int> ii;
typedef vector<int> vi;
typedef long double ld; 
typedef tree<ii, null_type, less<ii>, rb_tree_tag, tree_order_statistics_node_update> pbds;

int ans[1111111];

bool solve(string &s)
{
	int n=s.length();
	for(int i=0;i<n;i++) ans[i]=0;
	int ptr = 0;
	stack<int> S;
	for(int i=0;i<n;i++)
	{
		if(s[i]=='(')
		{
			S.push(i);
		}
		else
		{
			if(!S.empty())
			{
				int u=S.top();
				ans[i]|=1; ans[u]|=1; S.pop();
			}
			else
			{
				while(ptr<i&&(s[ptr]!='('||ans[ptr]>=3)) ptr++;
				if(ptr>=i) return 0;
				ans[ptr]|=2; ans[i]|=2; 
			}
		}
	}
	ptr=n-1;
	for(int i=n-1;i>=0;i--)
	{
		if(s[i]==')'||ans[i]>0) continue;
		while(ptr>i&&(s[ptr]!=')'||ans[ptr]>=3)) ptr--;
		if(ptr<=i) return 0;
		ans[i]|=2; ans[ptr]|=2;
	}
	return 1;
}

bool valid(string &s)
{
	int cnt=0;
	for(int i=0;i<s.length();i++)
	{
		if(s[i]=='(') cnt+=2;
		else cnt--;
		if(cnt<0) return false;
	}
	cnt=0;
	for(int i=int(s.length())-1;i>=0;i--)
	{
		if(s[i]==')') cnt+=2;
		else cnt--;
		if(cnt<0) return false;
	}
	return true;
}

const int MOD=1e9+7;

int add(int a, int b)
{
	a+=b;
	while(a>=MOD) a-=MOD;
	return a;
}

int mult(int a, int b)
{
	return (a*1LL*b)%MOD;
}

/*
const int C = 302;
int dp[303][606][906];

void gen(int n)
{
	freopen("parentrises-precomp.txt","w",stdout);
	memset(dp,0,sizeof(dp));
	cout<<"int ans[302]={0,";
	dp[0][0][C] = 1;
	for(int i=0;i<n;i++)
	{
		for(int j=0;j<2*n;j++)
		{
			for(int k=-n;k<2*n;k++)
			{
				if(dp[i][j][k+C]>0)
				{
					//+ (
					int v=dp[i][j][k+C];
					//cerr<<i<<' '<<j<<' '<<k<<' '<<v<<'\n';
					dp[i+1][j+2][min(-1, -1+k)+C]=add(dp[i+1][j+2][min(-1, -1+k)+C],v);
					//+ )
					if(j>0) dp[i+1][j-1][min(2,2+k)+C] = add(dp[i+1][j-1][min(2,2+k)+C],v);
				}
			}
		}
	}
	for(int i=1;i<=n;i++)
	{
		int ans=0;
		for(int j=0;j<=2*n;j++)
		{
			for(int k=0;k<=2*n;k++)
			{
				ans=add(ans,dp[i][j][k+C]);
			}
		}
		cout<<ans;
		if(i+1<=n) cout<<",";
	}
	cout<<"};";
	cout<<'\n';
	return ;
}
*/
int res[302]={0,0,1,2,2,6,12,18,43,86,148,326,652,1194,2531,5062,9578,19884,39768,76680,157236,314472,613440,1248198,2496396,4906266,9932707,19865414,39237478,79165646,158331292,313801154,631634323,263268639,509707998,43257469,86514938,72895660,288290012,576580024,551498904,962513721,925027435,204521844,634307677,268615347,287719520,559111350,118222693,578936427,105459291,210918582,360752402,920849461,841698915,421349166,985137176,970274345,96196738,666703791,333407575,448451120,71192847,142385694,391328273,82210164,164420328,697441626,75399225,150798450,177655189,77725370,155450740,578770998,806452500,612904993,342317187,437431531,874863062,166780006,649351541,298703075,764861307,105948983,211897966,169754380,332500687,665001374,648783808,296688714,593377428,43060831,684124175,368248343,973819030,849070862,698141717,982308804,88186365,176372730,959772055,320975583,641951166,825442333,311190079,622380158,765671696,14446067,28892134,262223145,966556598,933113189,520941027,287565710,575131420,666019185,263936054,527872108,39283492,877846547,755693087,433079969,737806887,475613767,203965075,701508060,403016113,922600280,277710517,555421034,408729101,377397802,754795604,250532053,528340400,56680793,124734442,232656836,465313672,714603167,631625056,263250105,52648990,389536240,779072480,641256163,302398795,604797590,697370162,632833340,265666673,626109777,298187773,596375546,406717000,515830626,31661245,524137426,667633864,335267721,338047842,390892123,781784246,93415445,65330389,130660778,151215664,822766849,645533691,833650616,380489231,760978462,54775313,491923347,983846694,322809267,940997512,881995017,596258099,507985218,15970429,557503950,859869218,719738429,474482700,767988978,535977949,635491203,387005395,774010790,702061186,253594815,507189630,31838831,822372294,644744581,231777149,215914547,431829094,482869402,576014681,152029355,369499245,244741222,489482444,95772722,952809165,905618323,304323137,304632041,609264082,102336119,335070266,670140532,858231094,960619772,921239537,859847032,56893721,113787442,360033502,982628521,965257035,849451750,439416129,878832258,991939394,464496385,928992770,267785589,802816545,605633083,763528731,474974661,949949322,864267253,946087508,892175009,476000768,273171027,546342054,550581443,469352643,938705286,624000951,673806443,347612879,434823692,233016716,466033432,103642988,440059594,880119188,788176043,40656596,81313192,286602731,202636014,405272028,733717711,472596468,945192936,553096598,892385168,784770329,912447619,707646096,415292185,526477156,861291715,722583423,111861393,588150125,176300243,301383510,244253166,488506332,629844702,421869639,843739278,290375226,384946885,769893770,95673275,473895679,947791358,891751001,164209639,328419278,62075416,175112411,350224822,934621064,806088783,612177559,897003764,948394637,896789267,953901352,418921686,837843372,499200486};

int main()
{
	ios_base::sync_with_stdio(0); cin.tie(0);
	//gen(301); return 0;
	/*
	int n; cin>>n;
	for(int i=0;i<(1<<n);i++)
	{
		string s;
		for(int j=0;j<n;j++)
		{
			if(i&(1<<j)) s+='(';
			else s+=')';
		}
		bool tmp = solve(s);
		bool tmp2 = valid(s);
		if(tmp!=tmp2)
		{
			cout<<s<<'\n'; return 0;
		}
	}
	return 0;
	*/
	int type; cin>>type;
	int t; cin>>t;
	while(t--)
	{
		if(type==1)
		{
			string s; cin>>s; 
			bool tmp = solve(s);
			if(!tmp) 
			{
				cout<<"impossible\n"; 
				continue;
			}
			for(int i=0;i<s.length();i++)
			{
				if(ans[i]==1) cout<<"B";
				else if(ans[i]==2) cout<<"R";
				else cout<<"G";
			}
			cout<<'\n';		
		}
		else
		{
			int n; cin>>n;
			cout<<res[n]<<'\n';
		}
	}
}

Compilation message

parentrises.cpp: In function 'bool valid(std::__cxx11::string&)':
parentrises.cpp:62:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<s.length();i++)
              ~^~~~~~~~~~~
parentrises.cpp: In function 'int main()':
parentrises.cpp:176:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int i=0;i<s.length();i++)
                ~^~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 504 KB Output is correct
3 Correct 2 ms 504 KB Output is correct
4 Correct 2 ms 544 KB Output is correct
5 Correct 2 ms 568 KB Output is correct

Subtask #2
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 588 KB Output is correct
2 Correct 2 ms 608 KB Output is correct
3 Correct 2 ms 624 KB Output is correct
4 Correct 2 ms 624 KB Output is correct
5 Correct 2 ms 632 KB Output is correct

Subtask #3
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 588 KB Output is correct
2 Correct 2 ms 608 KB Output is correct
3 Correct 2 ms 624 KB Output is correct
4 Correct 2 ms 624 KB Output is correct
5 Correct 2 ms 632 KB Output is correct
6 Correct 2 ms 636 KB Output is correct
7 Correct 2 ms 676 KB Output is correct
8 Correct 2 ms 680 KB Output is correct
9 Correct 2 ms 684 KB Output is correct
10 Correct 2 ms 688 KB Output is correct

Subtask #4
28.0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 588 KB Output is correct
2 Correct 2 ms 608 KB Output is correct
3 Correct 2 ms 624 KB Output is correct
4 Correct 2 ms 624 KB Output is correct
5 Correct 2 ms 632 KB Output is correct
6 Correct 2 ms 636 KB Output is correct
7 Correct 2 ms 676 KB Output is correct
8 Correct 2 ms 680 KB Output is correct
9 Correct 2 ms 684 KB Output is correct
10 Correct 2 ms 688 KB Output is correct
11 Correct 2 ms 692 KB Output is correct
12 Correct 2 ms 704 KB Output is correct
13 Correct 2 ms 732 KB Output is correct
14 Correct 2 ms 744 KB Output is correct
15 Correct 2 ms 772 KB Output is correct
16 Correct 6 ms 912 KB Output is correct
17 Correct 7 ms 1532 KB Output is correct
18 Correct 5 ms 1532 KB Output is correct
19 Correct 8 ms 1532 KB Output is correct
20 Correct 7 ms 1568 KB Output is correct
21 Correct 36 ms 1672 KB Output is correct
22 Correct 51 ms 6984 KB Output is correct
23 Correct 35 ms 6984 KB Output is correct
24 Correct 43 ms 6984 KB Output is correct
25 Correct 52 ms 6984 KB Output is correct

Subtask #5
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 6984 KB Output is correct

Subtask #6
16.0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 6984 KB Output is correct
2 Correct 2 ms 6984 KB Output is correct

Subtask #7
28.0 / 28.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 6984 KB Output is correct
2 Correct 2 ms 6984 KB Output is correct
3 Correct 2 ms 6984 KB Output is correct