Index: CheckList.pptx
==================================================================
--- CheckList.pptx
+++ CheckList.pptx
cannot compute difference between binary files

ADDED   SRM/557-U/1A.cpp
Index: SRM/557-U/1A.cpp
==================================================================
--- SRM/557-U/1A.cpp
+++ SRM/557-U/1A.cpp
@@ -0,0 +1,141 @@
+#include <iostream>
+#include <sstream>
+#include <iomanip>
+#include <vector>
+#include <string>
+#include <map>
+#include <set>
+#include <algorithm>
+#include <numeric>
+#include <iterator>
+#include <functional>
+#include <complex>
+#include <queue>
+#include <stack>
+#include <cmath>
+#include <cassert>
+using namespace std;
+typedef long long LL;
+typedef long double LD;
+typedef complex<LD> CMP;
+
+class FoxAndMountainEasy { public:
+	string possible(int n, int h0, int hn, string history)
+	{
+		int z = 0;
+		int min_z = 0;
+		for(int i=0; i<history.size(); ++i) {
+			z += (history[i]=='U' ? +1 : -1);
+			min_z = min(z, min_z);
+		}
+
+		for(int x=0; x+history.size()<=n; ++x)
+		{
+			int hx = h0 + x;
+			if(hx+min_z < 0)
+				continue;
+			int hy = hx + z;
+			if( possible(hn-hy, n-(x+history.size())) )
+				return "YES";
+		}
+		return "NO";
+	}
+
+	bool possible(int dh, int k)
+	{
+		if((k+dh)%2 != 0)
+			return false;
+		int u = (k+dh)/2;
+		int d = k - u;
+		return 0<=u && u<=k && u+d==k && u-d==dh;
+	}
+};
+
+// BEGIN CUT HERE
+#include <ctime>
+double start_time; string timer()
+ { ostringstream os; os << " (" << int((clock()-start_time)/CLOCKS_PER_SEC*1000) << " msec)"; return os.str(); }
+template<typename T> ostream& operator<<(ostream& os, const vector<T>& v)
+ { os << "{ ";
+   for(typename vector<T>::const_iterator it=v.begin(); it!=v.end(); ++it)
+   os << '\"' << *it << '\"' << (it+1==v.end() ? "" : ", "); os << " }"; return os; }
+void verify_case(const string& Expected, const string& Received) {
+ bool ok = (Expected == Received);
+ if(ok) cerr << "PASSED" << timer() << endl;  else { cerr << "FAILED" << timer() << endl;
+ cerr << "\to: \"" << Expected << '\"' << endl << "\tx: \"" << Received << '\"' << endl; } }
+#define CASE(N) {cerr << "Test Case #" << N << "..." << flush; start_time=clock();
+#define END	 verify_case(_, FoxAndMountainEasy().possible(n, h0, hn, history));}
+int main(){
+
+CASE(0)
+	int n = 4; 
+	int h0 = 0; 
+	int hn = 4; 
+	string history = "UU"; 
+	string _ = "YES"; 
+END
+CASE(1)
+	int n = 4; 
+	int h0 = 0; 
+	int hn = 4; 
+	string history = "D"; 
+	string _ = "NO"; 
+END
+CASE(2)
+	int n = 4; 
+	int h0 = 100000; 
+	int hn = 100000; 
+	string history = "DDU"; 
+	string _ = "YES"; 
+END
+CASE(3)
+	int n = 4; 
+	int h0 = 0; 
+	int hn = 0; 
+	string history = "DDU"; 
+	string _ = "NO"; 
+END
+CASE(4)
+	int n = 20; 
+	int h0 = 20; 
+	int hn = 20; 
+	string history = "UDUDUDUDUD"; 
+	string _ = "YES"; 
+END
+CASE(5)
+	int n = 20; 
+	int h0 = 0; 
+	int hn = 0; 
+	string history = "UUUUUUUUUU"; 
+	string _ = "YES"; 
+END
+CASE(6)
+	int n = 20; 
+	int h0 = 0; 
+	int hn = 0; 
+	string history = "UUUUUUUUUUU"; 
+	string _ = "NO"; 
+END
+CASE(7)
+	int n = 4; 
+	int h0 = 3; 
+	int hn = 1; 
+	string history = "U"; 
+	string _ = "YES"; 
+END
+CASE(8)
+	int n = 1; 
+	int h0 = 0; 
+	int hn = 1; 
+	string history = "U"; 
+	string _ = "YES"; 
+END
+CASE(8)
+	int n = 2; 
+	int h0 = 0; 
+	int hn = 0; 
+	string history = "DU"; 
+	string _ = "NO"; 
+END
+}
+// END CUT HERE

ADDED   SRM/557-U/1B.cpp
Index: SRM/557-U/1B.cpp
==================================================================
--- SRM/557-U/1B.cpp
+++ SRM/557-U/1B.cpp
@@ -0,0 +1,145 @@
+#include <iostream>
+#include <sstream>
+#include <iomanip>
+#include <vector>
+#include <string>
+#include <map>
+#include <set>
+#include <algorithm>
+#include <numeric>
+#include <iterator>
+#include <functional>
+#include <complex>
+#include <queue>
+#include <stack>
+#include <cmath>
+#include <cassert>
+using namespace std;
+typedef long long LL;
+typedef long double LD;
+typedef complex<LD> CMP;
+
+typedef int           vert;
+typedef vert          edge;
+typedef vector<edge>  edges;
+typedef vector<edges> graph;
+
+bool augment( graph& G, int v, vector<vert>& matchTo, bool visited[] )
+{
+	for(int i=0; i<G[v].size(); ++i) {
+		vert u = G[v][i];
+		if( visited[u] ) continue;
+		visited[u] = true;
+
+		if( matchTo[u]<0 || augment(G, matchTo[u], matchTo, visited) )
+			{ matchTo[v]=u, matchTo[u]=v; return true; }
+	}
+	return false;
+}
+
+template<int NV>
+int biMatch( graph& G, int L ) // [0,L):left, [L,?):right
+    // only left->right edges are used during computation
+{
+	vector<vert> matchTo(G.size(), -1);
+	int ans = 0;
+	for(vert v=0; v<L; ++v) {
+		bool visited[NV] = {};
+		if( augment(G, v, matchTo, visited) )
+			++ans;
+	}
+	return ans;
+}
+
+class Incubator { public:
+	int maxMagicalGirls(vector <string> love)
+	{
+		const int N = love.size();
+		vector< vector<int> > protects(N, vector<int>(N, false));
+		for(int i=0; i<N; ++i)
+		for(int j=0; j<N; ++j)
+			protects[i][j] = (love[i][j] == 'Y');
+		for(int k=0; k<N; ++k)
+		for(int i=0; i<N; ++i)
+		for(int j=0; j<N; ++j)
+			protects[i][j] |= protects[i][k] & protects[k][j];
+
+		int cand = N;
+
+		graph G(N*2);
+		for(int i=0; i<N; ++i)
+			if(protects[i][i]) {
+				--cand;
+			} else {
+				for(int j=0; j<N; ++j)
+					if(protects[i][j] && !protects[j][j])
+						G[i].push_back(N+j);
+			}
+
+		return cand - biMatch<512>(G, N);
+	}
+};
+
+// BEGIN CUT HERE
+#include <ctime>
+double start_time; string timer()
+ { ostringstream os; os << " (" << int((clock()-start_time)/CLOCKS_PER_SEC*1000) << " msec)"; return os.str(); }
+template<typename T> ostream& operator<<(ostream& os, const vector<T>& v)
+ { os << "{ ";
+   for(typename vector<T>::const_iterator it=v.begin(); it!=v.end(); ++it)
+   os << '\"' << *it << '\"' << (it+1==v.end() ? "" : ", "); os << " }"; return os; }
+void verify_case(const int& Expected, const int& Received) {
+ bool ok = (Expected == Received);
+ if(ok) cerr << "PASSED" << timer() << endl;  else { cerr << "FAILED" << timer() << endl;
+ cerr << "\to: \"" << Expected << '\"' << endl << "\tx: \"" << Received << '\"' << endl; } }
+#define CASE(N) {cerr << "Test Case #" << N << "..." << flush; start_time=clock();
+#define END	 verify_case(_, Incubator().maxMagicalGirls(love));}
+int main(){
+
+CASE(0)
+	string love_[] = {"NY","NN"};
+	  vector <string> love(love_, love_+sizeof(love_)/sizeof(*love_)); 
+	int _ = 1; 
+END
+CASE(1)
+	string love_[] = {"NYN", "NNY", "NNN"};
+	  vector <string> love(love_, love_+sizeof(love_)/sizeof(*love_)); 
+	int _ = 1; 
+END
+CASE(2)
+	string love_[] = {"NNYNN","NNYNN","NNNYY","NNNNN","NNNNN"};
+	  vector <string> love(love_, love_+sizeof(love_)/sizeof(*love_)); 
+	int _ = 2; 
+END
+CASE(3)
+	string love_[] = {"NNNNN","NYNNN","NYNYN","YNYNN","NNNNN"};
+	  vector <string> love(love_, love_+sizeof(love_)/sizeof(*love_)); 
+	int _ = 2; 
+END
+CASE(4)
+	string love_[] = {"NNNNN","NNNNN","NNNNN","NNNNN","NNNNN"};
+	  vector <string> love(love_, love_+sizeof(love_)/sizeof(*love_)); 
+	int _ = 5; 
+END
+CASE(5)
+	string love_[] = {"NNYNNNNN","NNNYNNNN","NNNNYNNN","NNYNNNNN","NNNNNYYN","NNNYNNNY","NNNNNNNN","NNNNNNNN"};
+	  vector <string> love(love_, love_+sizeof(love_)/sizeof(*love_)); 
+	int _ = 2; 
+END
+CASE(6)
+	string love_[] = {"Y"};
+	  vector <string> love(love_, love_+sizeof(love_)/sizeof(*love_)); 
+	int _ = 0; 
+END
+CASE(7)
+	string love_[] = {"NYNNN", "NNYNN", "NNYYY", "NNYYY", "NNYYY"};
+	  vector <string> love(love_, love_+sizeof(love_)/sizeof(*love_)); 
+	int _ = 1; 
+END
+CASE(8)
+string love_[] = {"NNYYYYY", "NNYYYYY", "NNNNNNN", "NNNYYYY", "NNNYYYY", "NNNYYYY", "NNNYYYY"};
+	  vector <string> love(love_, love_+sizeof(love_)/sizeof(*love_)); 
+	int _ = 2; 
+END
+}
+// END CUT HERE