Submission #236008

#	Time	Username	Problem	Language	Result	Execution time	Memory
236008		ant101	Uzastopni (COCI15_uzastopni)	C++14	160 / 160	145 ms	25976 KiB

uzastopni

#include <iostream>
#include <algorithm>
#include <cstring>
#include <iomanip>
#include <fstream>
#include <cmath>
#include <vector>
#include <set>
#include <unordered_set>
#include <unordered_map>
#include <map>
#include <stack>
#include <queue>
#include <assert.h>
#include <limits>
#include <cstdio>
using namespace std;

//#define RDEBUG 1
#ifdef RDEBUG
#define D(x) x
#else
#define D(x)
#endif
#define inf 0x7fffffff
#define MOD 1000000007


int add(int a, int b) {
    a += b;
    if(a >= MOD) {
        a -= MOD;
    }
    return a;
}
int sub(int a, int b) {
    a -= b;
    if(a < 0) {
        a += MOD;
    }
    return a;
}

int mul(int a, int b) {
    return (a * b)%MOD;
}

void add_self(int& a, int b) {
    a = add(a, b);
}
void sub_self(int& a, int b) {
    a = sub(a, b);
}
void mul_self(int& a, int b) {
    a = mul(a, b);
}


const int MAXN = 10010;

int N;
int V[MAXN];
vector<int> adj[MAXN];
set<int> lrange[101];
set<int> rrange[101];
set<int> st[MAXN];
set<int> en[MAXN];


void dfsleft(int node, int u) {
    st[node].insert(u);
    if (u <= 1) {
        return;
    }
    for (auto v : lrange[u-1]) {
        dfsleft(node, v);
    }
}

void dfsright(int node, int u) {
    en[node].insert(u);
    if (u >= 100) {
        return;
    }
    for (auto v : rrange[u+1]) {
        dfsright(node, v);
    }
}


void f(int u, int p) {
    for (int i = 0; i<adj[u].size(); i++) {
        int v = adj[u][i];
        if (v == p) {
            continue;
        }
        f(v, u);
    }
    for (int i = 0; i<101; i++) {
        lrange[i].clear();
        rrange[i].clear();
    }
    for (int i = 0; i<adj[u].size(); i++) {
        int v = adj[u][i];
        if (v == p) {
            continue;
        }
        for (auto first : st[v]) {
            for (auto second : en[v]) {
                if (first > second) {
                    continue;
                }
                lrange[second].insert(first);
                rrange[first].insert(second);
            }
        }
    }
    dfsleft(u, V[u]);
    dfsright(u, V[u]);
}

int main() {
    ios_base :: sync_with_stdio(false);
    cin >> N;
    for (int i = 1; i<=N; i++) {
        cin >> V[i];
    }
    for (int i = 0; i<N-1; i++) {
        int a, b;
        cin >> a >> b;
        adj[a].push_back(b);
        adj[b].push_back(a);
        
    }
    f(1, -1);
    cout << st[1].size()*en[1].size() << "\n";
    return 0;
}

Compilation message (stderr)

uzastopni.cpp: In function 'void f(int, int)':
uzastopni.cpp:92:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i<adj[u].size(); i++) {
                     ~^~~~~~~~~~~~~~
uzastopni.cpp:103:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i<adj[u].size(); i++) {
                     ~^~~~~~~~~~~~~~

• Subtask 1: 160 / 160