Submission #197526

#	Time	Username	Problem	Language	Result	Execution time	Memory
197526		SamAnd	Fish (IOI08_fish)	C++17	0 / 100	3089 ms	4216 KiB

fish

#include <bits/stdc++.h>
using namespace std;
const int N = 500005, K = 22;
struct ban
{
    int x, t;
};
bool operator<(const ban& a, const ban& b)
{
    return a.x < b.x;
}

int n, k, M;
ban a[N];

int q[K][K];

int u[K];
int main()
{
    scanf("%d%d%d", &n, &k, &M);
    for (int i = 1; i <= n; ++i)
    {
        scanf("%d%d", &a[i].x, &a[i].t);
        --a[i].t;
    }
    sort(a + 1, a + n + 1);
    for (int t = 0; t < k; ++t)
    {
        int maxu;
        for (int i = n; i >= 1; --i)
        {
            if (a[i].t == t)
            {
                maxu = a[i].x;
                break;
            }
        }
        for (int i = 1; i <= n; ++i)
        {
            if (a[i].x * 2 > maxu)
                break;
            ++q[t][a[i].t];
        }
        ++q[t][t];
    }
    int ans = 0;
    for (int x = 1; x < (1 << k); ++x)
    {
        int qq = 0;
        for (int i = 0; i < k; ++i)
            u[i] = N;
        for (int i = 0; i < k; ++i)
        {
            if ((x & (1 << i)))
            {
                ++qq;
                for (int j = 0; j < k; ++j)
                {
                    if ((x & (1 << j)))
                        u[i] = min(u[i], q[i][j] - 1);
                    else
                        u[i] = min(u[i], q[i][j]);
                }
            }
        }
        int yans = 1;
        for (int i = 0; i < k; ++i)
        {
            if (u[i] < 0)
                yans = 0;
            else
                yans = (yans * 1LL * (u[i] + 1)) % M;
        }
        if (qq % 2 == 1)
            ans = (ans + yans) % M;
        else
            ans = (ans - yans + M) % M;
    }
    ans = (ans - 1 + M) % M;
    printf("%d\n", ans);
    return 0;
}

Compilation message (stderr)

fish.cpp: In function 'int main()':
fish.cpp:21:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d%d", &n, &k, &M);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~
fish.cpp:24:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d", &a[i].x, &a[i].t);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
fish.cpp:41:13: warning: 'maxu' may be used uninitialized in this function [-Wmaybe-uninitialized]
             if (a[i].x * 2 > maxu)
             ^~

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