Submission #469256

#	Time	Username	Problem	Language	Result	Execution time	Memory
469256		cpp219	Džumbus (COCI19_dzumbus)	C++14	0 / 110	33 ms	23236 KiB

dzumbus

#include<bits/stdc++.h>
#define ll long long
#define ld long double
#define fs first
#define sc second
#define debug(y) cout<<y,exit(0)
using namespace std;
typedef pair<ll,ll> LL;
const ll N = 1e3 + 9;
const ll inf = 1e9 + 7;

vector<ll> g[N],dp[2][N],mix[N];
ll n,m,Q,a[N],total,was[N],ans[N];
LL q[200002];

void out(vector<ll> v){
    for (ll i = 0;i < v.size();i++) cout<<v[i]<<" "<<i<<"\n";
    exit(0);
}

vector<ll> combine(vector<ll> a,vector<ll> b,ll cond){
    vector<ll> res(a.size() + b.size() + 1,inf);
    for (ll i = 0;i < a.size();i++){
        res[i] = min(res[i],a[i]);
        for (ll j = 0;j < b.size();j++){
            if (i + j == 1) continue;
            if (cond && (j == 1 || i == 1)) continue;
            res[i + j] = min(res[i + j],a[i] + b[j]);
        }
    }
    return res;
}

void DFS(ll u,ll p){
    for (auto i : g[u]) if (i != p) DFS(i,u);
    dp[0][u] = {inf,a[u]}; dp[1][u] = {0,inf};
    //if (u == 1) out(dp[0][1]);
    for (auto i : g[u]) if (i != p){
        dp[0][u] = combine(dp[0][u],mix[i],0);
        dp[1][u] = combine(dp[1][u],mix[i],1);
    }
    for (ll i = 0;i < dp[0][u].size();i++)
        mix[u].push_back(min(dp[0][u][i],dp[1][u][i]));
}

vector<LL> v;

void preDFS(ll u,ll p){
    was[u] = 1;
    for (auto i : g[u]) if (i != p) preDFS(i,u);
}

int main(){
    ios_base::sync_with_stdio(NULL); cin.tie(0); cout.tie(0);
    #define task "tst"
    if (fopen(task".inp","r")){
        freopen(task".inp","r",stdin);
        //freopen(task".out","w",stdout);
    }
    cin>>n>>m;
    for (ll i = 1;i <= n;i++) cin>>a[i];
    while(m--){
        ll x,y; cin>>x>>y;
        g[x].push_back(y); g[y].push_back(x);
    }
    for (ll i = 1;i <= n;i++){
        if (!was[i]) preDFS(i,-1),g[0].push_back(i);
    }
    DFS(0,-1); //out(dp[0][1]);
    cin>>Q;
    for (ll i = 1;i <= Q;i++) cin>>q[i].fs,q[i].sc = i;
    sort(q + 1,q + Q + 1);
    for (ll i = 0;i < dp[1][0].size();i++){
        ll cur = dp[1][0][i];
        if (cur != inf) v.push_back({cur,i});
    }
    ll now = 0,sz = v.size();
    for (ll i = 1;i <= Q;i++){
        while(now < sz && v[now].fs <= q[i].fs) now++;
        ans[q[i].sc] = max(0ll,v[now - 1].sc);
    }
    for (ll i = 1;i <= Q;i++) cout<<ans[i]<<"\n";
}

/* stuff you should look for
	* int overflow, array bounds
	* special cases (n=1?)
	* do smth instead of nothing and stay organized
	* WRITE STUFF DOWN
	* DON'T GET STUCK ON ONE APPROACH
*/

Compilation message (stderr)

dzumbus.cpp: In function 'void out(std::vector<long long int>)':
dzumbus.cpp:17:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |     for (ll i = 0;i < v.size();i++) cout<<v[i]<<" "<<i<<"\n";
      |                   ~~^~~~~~~~~~
dzumbus.cpp: In function 'std::vector<long long int> combine(std::vector<long long int>, std::vector<long long int>, long long int)':
dzumbus.cpp:23:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |     for (ll i = 0;i < a.size();i++){
      |                   ~~^~~~~~~~~~
dzumbus.cpp:25:25: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |         for (ll j = 0;j < b.size();j++){
      |                       ~~^~~~~~~~~~
dzumbus.cpp: In function 'void DFS(long long int, long long int)':
dzumbus.cpp:42:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |     for (ll i = 0;i < dp[0][u].size();i++)
      |                   ~~^~~~~~~~~~~~~~~~~
dzumbus.cpp: In function 'int main()':
dzumbus.cpp:73:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   73 |     for (ll i = 0;i < dp[1][0].size();i++){
      |                   ~~^~~~~~~~~~~~~~~~~
dzumbus.cpp:57:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   57 |         freopen(task".inp","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 20
• Subtask 2: 0 / 30
• Subtask 3: 0 / 30
• Subtask 4: 0 / 30