Submission #242749

#	Time	Username	Problem	Language	Result	Execution time	Memory
242749		SamAnd	Sightseeing (NOI14_sightseeing)	C++17	15 / 25	3563 ms	183216 KiB

sightseeing

#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;

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);
            q[h.d].push_back(h);
        }
    }
}

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

sightseeing.cpp: In function 'void prr()':
sightseeing.cpp:57:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int i = 0; i < a[t.x].size(); ++i)
                         ~~^~~~~~~~~~~~~~~
sightseeing.cpp: In function 'void solv()':
sightseeing.cpp:69:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d%d", &n, &m, &qq);
     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~
sightseeing.cpp:73:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d%d", &x, &y, &z);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~
sightseeing.cpp:81:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d", &x);
         ~~~~~^~~~~~~~~~
sightseeing.cpp: In function 'void prr()':
sightseeing.cpp:42:13: warning: 't.ban::d' may be used uninitialized in this function [-Wmaybe-uninitialized]
         ban t;
             ^
sightseeing.cpp:54:23: warning: 't.ban::x' may be used uninitialized in this function [-Wmaybe-uninitialized]
         } while (c[t.x]);
                  ~~~~~^

• Subtask 1: 4 / 4
• Subtask 2: 5 / 5
• Subtask 3: 6 / 6
• Subtask 4: 0 / 10