Submission #223517

#	Time	Username	Problem	Language	Result	Execution time	Memory
223517		maomao90	Checker (COCI19_checker)	C++14	29 / 110	3078 ms	4816 KiB

checker

#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;
char temps[200005];
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);
    //assert(1 == 2);
    scanf(" %s", temps);
    for (int i = 1; i <= N; i++)
    {
        char temp = temps[i - 1];
        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;
    }
    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:77:19: warning: variable 'c' set but not used [-Wunused-but-set-variable]
         int x, y, c;
                   ^
checker.cpp:100:19: warning: variable 'c' set but not used [-Wunused-but-set-variable]
         int x, y, c;
                   ^
checker.cpp:45:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &tc, &N);
     ~~~~~^~~~~~~~~~~~~~~~~
checker.cpp:47:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf(" %s", temps);
     ~~~~~^~~~~~~~~~~~~~
checker.cpp:68:27: 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);
                      ~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 12 / 12
• Subtask 2: 17 / 17
• Subtask 3: 0 / 23
• Subtask 4: 0 / 23
• Subtask 5: 0 / 35