Submission #40012

#	Time	Username	Problem	Language	Result	Execution time	Memory
40012		5ak0	KOVANICE (COI15_kovanice)	C++14	50 / 100	2000 ms	39480 KiB

kovanice

/*
ID: 5ak0
PROG:
LANG: C++11
*/

#include <bits/stdc++.h>
#define fr first
#define sc second
#define pb push_back
#define mpr make_pair

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
const int INF = 1e9 + 7, MAXN = 3e5 + 10;

int n, m, v;
int l[MAXN], r[MAXN];
vector <int> g1[MAXN], g2[MAXN], gg[MAXN];
bool u[MAXN];

void dfs1(int v){
    for (auto to : g1[v]){
        l[to] = max(l[to], l[v] + 1);
        dfs1(to);
    }
}

void dfs2(int v){
    for (auto to : g2[v]){
        r[to] = min((r[to] == 0 ? INF : r[to]), r[v] - 1);
        dfs2(to);
    }
}

void dfs(int v){
    u[v] = 1;
    for (auto to : gg[v]){
        if (u[to] == 0){
            l[to] = l[v];
            r[to] = r[v];
            dfs(to);
        }
    }
}

int main(){
    cin >> n >> m >> v;
    for (int i = 1; i <= v; ++i){
        int a, b;
        char ch;
        cin >> a >> ch >> b;
        if (ch == '<'){
            g1[a].pb(b);
            g2[b].pb(a);
        }
        else{
            gg[a].pb(b);
            gg[b].pb(a);
        }
    }
    for (int i = 1; i <= m; ++i){
        if (g2[i].size() == 0 && g1[i].size() != 0){
            l[i] = 1;
            dfs1(i);
        }
    }
    for (int i = 1; i <= m; ++i){
        if (g1[i].size() == 0 && g2[i].size() != 0){
            r[i] = n;
            dfs2(i);
        }
    }
    for (int i = 1; i <= m; ++i)
        if (u[i] == 0 && l[i] != 0 && r[i] != 0)
            dfs(i);
    for (int i = 1; i <= m; ++i){
        if (l[i] != r[i] || l[i] == 0 || r[i] == 0)
            cout << "?\n";
        else
            cout << "K" << l[i] << "\n";
    }
    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 40 / 40
• Subtask 3: 0 / 10
• Subtask 4: 0 / 40