void Test2SATOnBigCNFs(const std::vector<Conjunct> &conjunctions, int variables_amount) {
try {
std::vector<Conjunct> conjunctions_copy = conjunctions;
random_shuffle(conjunctions_copy.begin(), conjunctions_copy.end());
std::vector<bool> values_of_variables(variables_amount);
if (TwoSAT(conjunctions, values_of_variables) != TwoSAT(conjunctions_copy, values_of_variables))
throw std::logic_error("FAIL");
} catch (const std::exception& ex) {
throw std::logic_error("Test2SATOnBigGraphs : " + std::string(ex.what()));
}
}
inline void StressTestTwoSAT(const std::vector<Conjunct>& conjunctions, int variables_amount) {
try {
std::vector<bool> values_of_variables(variables_amount);
bool is_satisfiable = TwoSAT(conjunctions, values_of_variables);
if (!is_satisfiable) {
bool right_is_satisfiable = false;
std::vector<bool> value(variables_amount, -1);
StupidIsSatisfiable(conjunctions, value, 0, right_is_satisfiable);
if (right_is_satisfiable) throw std::logic_error("FAIL");
return;
}
for (int i = 0; i < conjunctions.size(); ++i)
for (int conjunct_index = 0; conjunct_index < conjunctions.size(); ++conjunct_index) {
Conjunct conjunct = conjunctions[conjunct_index];
bool conjunct_1 = conjunct.is_positive_[0] ? values_of_variables[conjunct.variable_[0]] :
!values_of_variables[conjunct.variable_[0]];
bool conjunct_2 = conjunct.is_positive_[1] ? values_of_variables[conjunct.variable_[1]] :
!values_of_variables[conjunct.variable_[1]];
if (!(conjunct_1 || conjunct_2)) throw std::logic_error("FAIL");
}
} catch (const std::exception& ex) {
throw std::logic_error("TestTwoSAT: " + std::string(ex.what()));
}
}
int main()
{
int i,n,len,j;
char s1[9],s2[9];
freopen("poj3683.txt","r",stdin);
freopen("poj3683ans.txt","w",stdout);
while (scanf("%d",&n)!=EOF)
{
InitEdge();
for (i=1;i<=n;i++)
{
scanf("%s%s%d",s1,s2,&len);
wed[i].start=TimeStrToInt(s1);
wed[i].end=TimeStrToInt(s2);
wed[i].len=len;
}
for (i=1;i<=n;i++)
for (j=1;j<=n;j++)
{
if (i==j) continue;
if (Conflict(wed[i].start,wed[i].len,wed[j].start,wed[j].len)) AddEdge(i,j+n);
if (Conflict(wed[i].start,wed[i].len,wed[j].end-wed[j].len,wed[j].len)) AddEdge(i,j);
if (Conflict(wed[i].end-wed[i].len,wed[i].len,wed[j].start,wed[j].len)) AddEdge(i+n,j+n);
if (Conflict(wed[i].end-wed[i].len,wed[i].len,wed[j].end-wed[j].len,wed[j].len)) AddEdge(i+n,j);
}
if (TwoSAT(n))
{
printf("YES\n");
for (i=1;i<=n;i++) if (ans[i])
{
PrintTime(wed[i].start);
printf(" ");
PrintTime(wed[i].start+wed[i].len);
printf("\n");
}
else
{
PrintTime(wed[i].end-wed[i].len);
printf(" ");
PrintTime(wed[i].end);
printf("\n");
}
}
else printf("NO\n");
}
return 0;
}