oj.uz

Submission #242751

# Submission time Handle Problem Language Result Execution time Memory
242751 2020-06-29T08:54:07 Z SamAnd Sightseeing (NOI14_sightseeing) C++17
15 / 25
 3500 ms 183500 KB 
#include <bits/stdc++.h>
using namespace std;
#define m_p make_pair
#define all(x) (x).begin(),(x).end()
#define sz(x) ((int)(x).size())
#define fi first
#define se second
typedef long long ll;
mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());
mt19937 rnf(2106);
const int N = 500005;

int ka()
{
    int x = 0;
    while (1)
    {
        char y = getchar();
        if ('0' <= y && y <= '9')
            x = (x * 10) + (y - '0');
        else
            return x;
    }
}

struct ban
{
    int x, d;
    ban(){}
    ban(int x, int d)
    {
        this->x = x;
        this->d = d;
    }
};
bool operator<(const ban& a, const ban& b)
{
    return a.d < b.d;
}

int n, m;
vector<ban> a[N];

bool c[N];
int ans[N];

vector<ban> q[N];

void prr()
{
    int j = N - 1;
    q[N - 1].push_back(ban(1, N - 1));
    while (1)
    {
        ban t;
        do
        {
            if (j == -1)
                return;
            if (q[j].empty())
            {
                --j;
                continue;
            }
            t = q[j].back();
            q[j].pop_back();
        } while (c[t.x]);
        c[t.x] = true;
        ans[t.x] = t.d;
        for (int i = 0; i < a[t.x].size(); ++i)
        {
            ban h = a[t.x][i];
            h.d = min(h.d, t.d);
            if (!c[h.x])
                q[h.d].push_back(h);
        }
    }
}

void solv()
{
    int qq;
    n = ka();
    m = ka();
    qq = ka();
    for (int i = 0; i < m; ++i)
    {
        int x, y, z;
        x = ka();
        y = ka();
        z = ka();
        a[x].push_back(ban(y, z));
        a[y].push_back(ban(x, z));
    }
    prr();
    while (qq--)
    {
        int x;
        x = ka();
        printf("%d\n", ans[x]);
    }
}

int main()
{
    #ifdef SOMETHING
    freopen("input.txt", "r", stdin);
    //freopen("output.txt", "w", stdout);
    #endif // SOMETHING
    //ios_base::sync_with_stdio(false), cin.tie(0);
    solv();
    return 0;
}

//while ((double)clock() / CLOCKS_PER_SEC <= 0.9){}

Compilation message

sightseeing.cpp: In function 'void prr()':
sightseeing.cpp:70:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int i = 0; i < a[t.x].size(); ++i)
                         ~~^~~~~~~~~~~~~~~
sightseeing.cpp:55:13: warning: 't.ban::d' may be used uninitialized in this function [-Wmaybe-uninitialized]
         ban t;
             ^
sightseeing.cpp:67:23: warning: 't.ban::x' may be used uninitialized in this function [-Wmaybe-uninitialized]
         } while (c[t.x]);
                  ~~~~~^

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 23808 KB Output is correct
2 Correct 20 ms 23808 KB Output is correct

Subtask #2
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 21 ms 24064 KB Output is correct
2 Correct 21 ms 23808 KB Output is correct

Subtask #3
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 56 ms 27000 KB Output is correct
2 Correct 42 ms 26364 KB Output is correct

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2918 ms 147048 KB Output is correct
2 Execution timed out 3593 ms 183500 KB Time limit exceeded