Submission #1214545

#	Time	Username	Problem	Language	Result	Execution time	Memory
1214545		nrg_studio	timeismoney (balkan11_timeismoney)	C++20	50 / 100	2097 ms	33112 KiB

timeismoney

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

#define ll long long
#define pb push_back
#define pii pair<int,int>
#define f first
#define s second
#define chmin(a, b) a = min(a,b)
#define chmax(a, b) a = max(a,b)
#define FOR(i, a, b) for (int i = (a); i < (b); i++)
#define F0R(i, a) for (int i = 0; i < (a); i++)
#define all(x) x.begin(),x.end()
#define vec vector

const int MAX_N = 200, MAX_M = 10000;

struct DSU {
    int par[MAX_N], sz[MAX_N];

    int get(int x) {return par[x]==x ? x : par[x]=get(par[x]);}
    bool unite(int a, int b) {
        a = get(a); b = get(b);
        if (a==b) {return false;}
        if (sz[a]<sz[b]) {swap(a,b);}
        par[b] = a; sz[a] += sz[b];
        return true;
    }

    void reset() {
        iota(par,par+MAX_N,0);
        memset(sz,1,sizeof(sz));
    }
};

struct Edge {
    int u, v, t, c;
};
bool cmp1(const Edge& a, const Edge& b) {return a.t<b.t;}
bool cmp2(const Edge& a, const Edge& b) {return a.c<b.c;}
Edge ed[MAX_M];
DSU dsu;
ll c_ans = 1e9, t_ans = 1e9, c_tot, t_tot;
Edge ans[MAX_N], cand[MAX_N];
int n, m;

ll scalex, scaley;
bool cmp3(const Edge& a, const Edge& b) {return scalex*a.t+scaley*a.c<scalex*b.t+scaley*b.c;}

void calc() {
    dsu.reset();
    c_tot = 0, t_tot = 0;
    for (int i=0,ptr=0;i<m;i++) {
        if (dsu.unite(ed[i].u,ed[i].v)) {
            cand[ptr++] = ed[i];
            c_tot += ed[i].c; t_tot += ed[i].t;
            if (ptr==n-1) {break;}
        }
    } if (c_tot*t_tot<c_ans*t_ans) {
        c_ans = c_tot; t_ans = t_tot;
        copy(cand,cand+n-1,ans);
    }
}

int main() {
    ios::sync_with_stdio(false); cin.tie(0);

    cin >> n >> m;
    for (int i=0;i<m;i++) {cin >> ed[i].u >> ed[i].v >> ed[i].t >> ed[i].c;}

    stack<pair<pii,pii>> todo;
    sort(ed,ed+m,cmp1); calc();
    pii a0 = {t_tot,c_tot};
    //ll ax = t_tot, ay = c_tot;
    sort(ed,ed+m,cmp2); calc();
    pii b0 = {t_tot,c_tot};
    //ll bx = t_tot, by = c_tot;
    //cout << ax<<' ' <<ay<<' '<<bx<<' '<<by<<'\n';
    //solve(ax,ay,bx,by);
    todo.push({a0,b0});
    while (todo.size()) {
        auto[a,b] = todo.top(); todo.pop();
        scalex = a.s-b.s; scaley = b.f-a.f;
        sort(ed,ed+m,cmp3);
        calc();
        pii c = {t_tot,c_tot};
        if ((ll)(b.f-a.f)*(c.s-a.s)-(ll)(b.s-a.s)*(c.f-a.f)<=0 && c!=a && c!=b) {
            todo.push({a,c});
            todo.push({c,b});
        }
    }
    cout << t_ans << ' ' << c_ans << '\n';
    for (int i=0;i<n-1;i++) {cout << ans[i].u << ' ' << ans[i].v << '\n';}
}

• Subtask 1: 50 / 100