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 <cstdio>
#include <algorithm>
#include <utility>
#include <unordered_map>
#include <tuple>
#include <cmath>
#include <cassert>
using namespace std;
typedef pair <int, int> ii;
typedef pair <ii, int> iii;
struct pair_hash
{
template <class T1, class T2>
std::size_t operator() (const std::pair<T1, T2> &pair) const
{
return std::hash<T1>()(pair.first) ^ std::hash<T2>()(pair.second);
}
};
int tc;
int N;
iii diagonals[200005];
unordered_map <ii, int, pair_hash> colours;
bool isInvalid[200005];
int impt1[200005], impt2[200005];
bool comp(iii right, iii left)
{
int rx, ry, lx, ly;
tie(rx, ry) = right.first; tie(lx, ly) = left.first;
if (abs(rx - ry) < abs(lx - ly)) return true;
else if (abs(rx - ry) == abs(lx - ly))
{
if (rx < ry) return true;
}
return false;
}
int main()
{
scanf("%d%d", &tc, &N);
for (int i = 1; i <= N; i++)
{
char temp; scanf(" %c", &temp);
if (i == N)
{
colours[ii(i, 1)] = (int) temp - '0';
colours[ii(1, i)] = (int) temp - '0';
}
else
{
colours[ii(i, i + 1)] = (int) temp - '0';
colours[ii(i + 1, i)] = (int) temp - '0';
}
if (i == N) impt1[i] = 1;
else impt1[i] = i + 1;
if (i == 1) impt2[i] = N;
else impt2[i] = i - 1;
}
assert(1 == 2);
for (int i = 0; i < N - 3; i++)
{
int X, Y, C; scanf("%d%d%d", &X, &Y, &C);
if (X > Y) swap(X, Y);
diagonals[i] = iii(ii(X, Y), C);
colours[ii(X, Y)] = C;
colours[ii(Y, X)] = C;
}
sort(diagonals, diagonals + N - 3, comp);
for (int i = 0; i < N - 3; i++)
{
int x, y, c;
tie(x, y) = diagonals[i].first; c = diagonals[i].second;
if (isInvalid[x] || isInvalid[y])
{
printf("neispravna triangulacija\n");
return 0;
}
int impt;
if (impt1[x] == impt1[y] || impt1[x] == impt2[y]) impt = impt1[x];
else impt = impt2[x];
isInvalid[impt] = true;
if (impt1[x] == impt) impt1[x] = y;
else impt2[x] = y;
if (impt1[y] == impt) impt1[y] = x;
else impt2[y] = x;
}
for (int i = 1; i <= N; i++)
{
impt1[i] = i == N ? 1 : i + 1;
impt2[i] = i == 1 ? N : i - 1;
}
for (int i = 0; i < N - 3; i++)
{
int x, y, c;
tie(x, y) = diagonals[i].first; c = diagonals[i].second;
int impt;
if (impt1[x] == impt1[y] || impt1[x] == impt2[y]) impt = impt1[x];
else impt = impt2[x];
if (colours[ii(x, y)] == colours[ii(x, impt)] ||
colours[ii(x, y)] == colours[ii(y, impt)] ||
colours[ii(x, impt)] == colours[ii(y, impt)])
{
printf("neispravno bojenje\n");
return 0;
}
if (impt1[x] == impt) impt1[x] = y;
else impt2[x] = y;
if (impt1[y] == impt) impt1[y] = x;
else impt2[y] = x;
}
printf("tocno\n");
return 0;
}
Compilation message (stderr)
checker.cpp: In function 'int main()':
checker.cpp:75:19: warning: variable 'c' set but not used [-Wunused-but-set-variable]
int x, y, c;
^
checker.cpp:98:19: warning: variable 'c' set but not used [-Wunused-but-set-variable]
int x, y, c;
^
checker.cpp:44:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d%d", &tc, &N);
~~~~~^~~~~~~~~~~~~~~~~
checker.cpp:47:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
char temp; scanf(" %c", &temp);
~~~~~^~~~~~~~~~~~~~
checker.cpp:66:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
int X, Y, C; scanf("%d%d%d", &X, &Y, &C);
~~~~~^~~~~~~~~~~~~~~~~~~~~~
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