Submission #127107

#	Time	Username	Problem	Language	Result	Execution time	Memory
127107		eriksuenderhauf	Traffic (CEOI11_tra)	C++11	100 / 100	1438 ms	98964 KiB

tra

//#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define enl printf("\n")
#define case(t) printf("Case #%d: ", (t))
#define ni(n) scanf("%d", &(n))
#define nl(n) scanf("%I64d", &(n))
#define nai(a, n) for (int i = 0; i < (n); i++) ni(a[i])
#define nal(a, n) for (int i = 0; i < (n); i++) nl(a[i])
#define pri(n) printf("%d\n", (n))
#define prl(n) printf("%I64d\n", (n))
#define pii pair<int, int>
#define pll pair<long long, long long>
#define vii vector<pii>
#define vi vector<int>
#define pb push_back
#define mp make_pair
#define fi first
#define se second
using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef cc_hash_table<int,int,hash<int>> ht;
const double pi = acos(-1);
const int MOD = 1e9 + 7;
const int INF = 1e9 + 7;
const int MAXN = 1e6 + 5;
const double eps = 1e-9;
pair<pii,int> X[MAXN];
int ind[MAXN], Y[MAXN];
int vis[MAXN], mrk[MAXN], hi[MAXN], lo[MAXN];
vi adj[MAXN];
vi radj[MAXN];

int main()
{
    int n, m, a, b;
    ni(n), ni(m), ni(a), ni(b);
    for (int i = 0; i < n; i++)
    {
        ni(X[i].fi.fi), ni(X[i].fi.se);
        X[i].se = i;
        Y[i] = X[i].fi.fi;
    }
    sort(X, X + n, [](pair<pii,int> lhs, pair<pii,int> rhs) -> bool
         {
            if (lhs.fi.fi == rhs.fi.fi)
                return lhs.fi.se > rhs.fi.se;
            return lhs.fi.fi < rhs.fi.fi;
         });
    for (int i = 0; i < m; i++)
    {
        int c, d, k;
        ni(c), ni(d), ni(k);
        c--, d--;
        adj[c].pb(d), radj[d].pb(c);;
        if (k == 2)
            adj[d].pb(c), radj[c].pb(d);
    }
    list<int> pq;

    for (int i = n - 1; i >= 0 && X[i].fi.fi == a; i--)
        pq.pb(X[i].se), vis[X[i].se] = 1;
    while (!pq.empty())
    {
        int u = pq.front(); pq.pop_front();
        for (int v: radj[u])
            if (!vis[v])
            {
                pq.pb(v);
                vis[v] = 1;
            }
    }
    for (int i = 0; i < n && X[i].fi.fi == 0; i++)
        if (!vis[X[i].se])
            mrk[X[i].se] = 1; // remove from left hand side

    memset(vis, 0, sizeof vis);
    for (int i = 0; i < n && X[i].fi.fi == 0; i++)
        pq.pb(X[i].se), vis[X[i].se] = 1;
    while (!pq.empty())
    {
        int u = pq.front(); pq.pop_front();
        for (int v: adj[u])
            if (!vis[v])
            {
                pq.pb(v);
                vis[v] = 1;
            }
    }
    for (int i = n - 1; i >= 0 && X[i].fi.fi == a; i--)
        if (!vis[X[i].se])
            mrk[X[i].se] = 1; // remove from right hand side

    int cnt = 0;
    for (int i = n - 1; i >= 0; i--)
    {
        if (mrk[X[i].se] || X[i].fi.fi != a)
            continue;
        ind[X[i].se] = cnt++;
    }

    memset(vis, 0, sizeof vis);
    for (int i = 0; i < n && X[i].fi.fi == 0; i++)
    {
        if (i > 0)
            lo[i] = lo[i - 1];
        else
            lo[i] = -1;
        if (mrk[X[i].se])
            continue;
        pq.pb(X[i].se);
        while (!pq.empty())
        {
            int u = pq.front(); pq.pop_front();
            if (Y[u] == a && (lo[i] == -1 || lo[i] > ind[u]))
                lo[i] = ind[u];
            for (int v: adj[u])
            {
                if (vis[v])
                    continue;
                pq.pb(v);
                vis[v] = 1;
            }
        }
    }
    memset(vis, 0, sizeof vis);
    for (int i = n - 1; i >= 0 ; i--)
    {
        if (i == n - 1)
            hi[i] = -1;
        else
            hi[i] = hi[i + 1];
        if (mrk[X[i].se] || X[i].fi.fi != 0)
            continue;
        pq.pb(X[i].se);
        while (!pq.empty())
        {
            int u = pq.front(); pq.pop_front();
            if (Y[u] == a && (hi[i] == -1 || hi[i] < ind[u]))
                hi[i] = ind[u];
            for (int v: adj[u])
            {
                if (vis[v])
                    continue;
                pq.pb(v);
                vis[v] = 1;
            }
        }
    }
    for (int i = 0; i < n && X[i].fi.fi == 0; i++)
    {
        if (mrk[X[i].se])
            pri(0);
        else
            pri(hi[i] - lo[i] + 1);
    }
    return 0;
}

Compilation message (stderr)

tra.cpp: In function 'int main()':
tra.cpp:39:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     ni(n), ni(m), ni(a), ni(b);
                        ^
tra.cpp:39:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
tra.cpp:39:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
tra.cpp:39:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
tra.cpp:42:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         ni(X[i].fi.fi), ni(X[i].fi.se);
                       ^
tra.cpp:42:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
tra.cpp:55:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         ni(c), ni(d), ni(k);
                     ^
tra.cpp:55:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
tra.cpp:55:21: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]

• Subtask 1: 8 / 8
• Subtask 2: 8 / 8
• Subtask 3: 8 / 8
• Subtask 4: 8 / 8
• Subtask 5: 8 / 8
• Subtask 6: 8 / 8
• Subtask 7: 8 / 8
• Subtask 8: 8 / 8
• Subtask 9: 9 / 9
• Subtask 10: 9 / 9
• Subtask 11: 9 / 9
• Subtask 12: 9 / 9