Submission #895713

#	Time	Username	Problem	Language	Result	Execution time	Memory
895713		Ludissey	Training (IOI07_training)	C++14	10 / 100	1067 ms	1464 KiB

training

#include <bits/stdc++.h>
using namespace std;

#define int long long

int n,m;

vector<vector<int>> paved;
vector<pair<pair<int,int>, int>> edges;
map<pair<vector<bool>, int>, int> memo;

int dp(vector<bool> cyc, int x){
    if(memo.find({cyc, x})!=memo.end()) return memo[{cyc,x}];
    if(x==m-(n-1)) return memo[{cyc,x}]=0;
    int mx=0;
    for (int e = x; e < m-(n-1); e++)
    {
        int a=edges[e].first.first,b=edges[e].first.second,c=edges[e].second;
        if(abs(a-b)%2!=0) continue;
        bool br=false;
        for (int i = min(a,b); i < max(a,b); i++)
        {
            if(cyc[i]) {
                br=true;
                break;
            }
        }
        if(br) continue;
        for (int i = min(a,b); i < max(a,b); i++) cyc[i]=true;
        mx=max(dp(cyc, e+1)+c,mx);
        for (int i = min(a,b); i < max(a,b); i++) cyc[i]=false;
    }
    return mx;
}

signed main() {
	// Input:
    ios::sync_with_stdio(false); cin.tie(nullptr);
    cin>>n>>m;
    vector<int> conv(n+1); 
    paved.resize(n+1);
    int sum=0;
    for (int i = 0; i < m; i++)
    {
        int a,b,c; cin >> a >> b >> c;
        sum+=c;
        if(a>b) swap(a,b);
        if(c==0) {
            paved[a].push_back(b);
            paved[b].push_back(a);
        }
        else edges.push_back({{a,b},c});
    }
    int c=-1;
    for (int i = n; i >= 1; i--) { if(paved[i].size()==1) c=i; }
    int p=-1;
    int i=1;
    while(i<=n){
        conv[c]=i;
        if(paved[c][0]==p){
            p=c;
            c=paved[c][1];
        }
        else {
            p=c;
            c=paved[c][0];
        }
        i++;
    }
    for (int j = 0; j < m-(n-1); j++)
    {
        edges[j].first.first=conv[edges[j].first.first];
        edges[j].first.second=conv[edges[j].first.second];
    }
    vector<bool> cyc(n+1);
    cout << sum-dp(cyc, 0) << "\n";
    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 0 / 10
• Subtask 3: 0 / 10
• Subtask 4: 0 / 7
• Subtask 5: 0 / 9
• Subtask 6: 0 / 9
• Subtask 7: 0 / 9
• Subtask 8: 0 / 9
• Subtask 9: 0 / 9
• Subtask 10: 0 / 9
• Subtask 11: 0 / 9