oj.uz

Submission #242741

# Submission time Handle Problem Language Result Execution time Memory
242741 2020-06-29T08:20:06 Z SamAnd Ferries (NOI13_ferries) C++17
40 / 40
 326 ms 18164 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 = 100005;

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

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;
}

bool c[N];

void solv()
{
    scanf("%d%d", &n, &m);
    while (m--)
    {
        int x, y, z;
        scanf("%d%d%d", &x, &y, &z);
        a[y].push_back(x);
        b[x].push_back(z);
    }
    for (int x = 1; x <= n; ++x)
    {
        sort(all(b[x]));
    }
    priority_queue<ban> q;
    q.push(ban(n, 0));
    while (1)
    {
        ban t;
        do
        {
            t = q.top();
            q.pop();
        } while (c[t.x]);
        c[t.x] = true;
        if (t.x == 1)
        {
            printf("%d\n", t.d);
            return;
        }
        for (int i = 0; i < a[t.x].size(); ++i)
        {
            ban h;
            h.x = a[t.x][i];
            h.d = t.d;
            h.d += b[h.x].back();
            b[h.x].pop_back();
            q.push(h);
        }
    }
}

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

ferries.cpp: In function 'void solv()':
ferries.cpp:63:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for (int i = 0; i < a[t.x].size(); ++i)
                         ~~^~~~~~~~~~~~~~~
ferries.cpp:35:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~
ferries.cpp:39:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d%d", &x, &y, &z);
         ~~~~~^~~~~~~~~~~~~~~~~~~~~~

Subtask #1
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 8 ms 4992 KB Output is correct
2 Correct 8 ms 4992 KB Output is correct
3 Correct 18 ms 6272 KB Output is correct
4 Correct 143 ms 16228 KB Output is correct
5 Correct 132 ms 16280 KB Output is correct

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 4992 KB Output is correct
2 Correct 8 ms 5120 KB Output is correct
3 Correct 17 ms 6144 KB Output is correct
4 Correct 74 ms 10608 KB Output is correct
5 Correct 86 ms 13688 KB Output is correct

Subtask #3
11.0 / 11.0

# Verdict Execution time Memory Grader output
1 Correct 26 ms 6144 KB Output is correct
2 Correct 25 ms 6144 KB Output is correct
3 Correct 288 ms 16888 KB Output is correct
4 Correct 313 ms 17400 KB Output is correct
5 Correct 326 ms 16504 KB Output is correct

Subtask #4
12.0 / 12.0

# Verdict Execution time Memory Grader output
1 Correct 298 ms 16888 KB Output is correct
2 Correct 287 ms 16888 KB Output is correct
3 Correct 265 ms 17252 KB Output is correct
4 Correct 294 ms 18164 KB Output is correct
5 Correct 300 ms 18036 KB Output is correct