#include<iostream>
using namespace std;
#include<vector>
#include<algorithm>
int const N = 510;
int a, n;
int g[N][N];
bool vis[N];
int fat[N];
struct things
{
int x;
int y;
int money;
};
vector<things>v;
bool compare(things t1, things t2)
{
return t1.money < t2.money;
}
int father(int x)
{
return fat[x] == x ? x : father(fat[x]);
}
int main()
{
cin >> a >>n;
for (int i = 1;i <= n;i++)
{
fat[i] = i;
for (int j = 1;j <= n;j++)
{
cin >> g[i][j];
if (g[i][j] == 0)
{
g[i][j] = a;
}
}
}
things t;
for (int i = 1;i < n;i++)
{
for (int j = i + 1;j <= n;j++)
{
t.x = i;
t.y = j;
t.money = g[i][j];
v.push_back(t);
}
}
sort(v.begin(), v.end(), compare);
int cnt = 1;
long long ans = a;
for (vector<things>::iterator it = v.begin();it != v.end();it++)
{
if (father((*it).x) != father((*it).y))
{
int x = father((*it).x), y = father((*it).y);
fat[x] = fat[y];
cnt++;
if ((*it).money < a)
{
ans += (*it).money;
}
else
{
ans += a;
}
}
if (cnt == n)break;
}
cout << ans << endl;
return 0;
}
cpp复制代码
#include<iostream>
#include<cstring>
using namespace std;
int const N = 1010;
int fa[N];
int find(int x)
{
if (fa[x] != x)
{
fa[x] = find(fa[x]);
}
return fa[x];
}
void unity(int x, int y)
{
int r1 = find(x);
int r2 = find(y);
fa[r1] = r2;
}
int main()
{
int n, k;
cin >> n;
while (n != 0)
{
cin >> k;
for (int i = 1;i <= n;i++)
{
fa[i] = i;
}
for (int i = 1;i <= k;i++)
{
int u, v;
cin >> u >> v;
unity(u, v);
}
int ans = -1;
for (int i = 1;i <= n;i++)
{
if (fa[i] == i)
{
ans++;
}
}
cout << ans << endl;
cin >> n;
}
return 0;
}
cpp复制代码
#include<iostream>
using namespace std;
#include<vector>
#include<algorithm>
int n, m, k;
int fa[1010];
int find(int x)
{
if (fa[x] != x)
{
fa[x] = find(fa[x]);
}
return fa[x];
}
void unity(int x, int y)
{
int r1 = find(x);
int r2 = find(y);
fa[r1] = r2;
}
struct lt
{
int x;
int y;
int dj;
};
bool cmp(lt l1, lt l2)
{
return l1.dj < l2.dj;
}
int main()
{
vector<lt>v;
lt l;
cin >> n >> m >> k;
for (int i = 1;i <= n;i++)
{
fa[i] = i;
}
for (int i = 1;i <= m;i++)
{
cin >> l.x >> l.y >> l.dj;
v.push_back(l);
}
sort(v.begin(), v.end(), cmp);
int cnt = n;
long long ans = 0;
int length = v.size();
//cout << endl << endl << endl;
for (int i = 0;i < length;i++)
{
//cout << v[i].x<<" " << v[i].y<<" " << v[i].dj << endl;
if (cnt == k)
{
cout << ans << endl;
return 0;
}
if (find(v[i].x) != find(v[i].y))
{
unity(find(v[i].x), find(v[i].y));
ans += v[i].dj;
cnt--;
}
if (cnt == k)
{
cout << ans << endl;
return 0;
}
}
cout << "No Answer" << endl;
return 0;
}
cpp复制代码
#include<iostream>
using namespace std;
#include<vector>
#include<algorithm>
int n, m, s, t;
int const N = 101000;
int fa[N];
struct lu
{
int x;
int y;
int yongji;
};
bool cmp(lu l1, lu l2)
{
return l1.yongji < l2.yongji;
}
int find(int x)
{
if (fa[x] != x)
{
fa[x] = find(fa[x]);
}
return fa[x];
}
void unity(int x, int y)
{
int r1 = find(x);
int r2 = find(y);
fa[r1] = r2;
}
int main()
{
cin >> n >> m >> s >> t;
vector<lu>v;
lu l;
for (int i = 1;i <= n;i++)
{
fa[i] = i;
}
for (int i = 1;i <= m;i++)
{
cin >> l.x >> l.y >> l.yongji;
v.push_back(l);
}
sort(v.begin(), v.end(), cmp);
long long ans = 0;
for (vector<lu>::iterator it = v.begin();it != v.end();it++)
{
int x = (*it).x;
int y = (*it).y;
if (find(x) != find(y))
{
unity(find(x), find(y));
}
if (find(s) == find(t))
{
cout <<(*it).yongji << endl;
return 0;
}
}
return 0;
}
cpp复制代码
#include<iostream>
#include<algorithm>
using namespace std;
int const N = 110;
struct wl
{
int x;
int y;
int jl;
};
int n;
int fa[N];
int g[N][N];
wl w[N*N];
bool cmp(wl w1, wl w2)
{
return w1.jl < w2.jl;
}
int find(int x)
{
if (fa[x] != x)
{
fa[x] = find(fa[x]);
}
return fa[x];
}
void unity(int x, int y)
{
int r1 = find(x);
int r2 = find(y);
fa[r1] = r2;
}
int main()
{
cin >> n;
for (int i = 1;i <= n;i++)
{
fa[i] = i;
for (int j = 1;j <= n;j++)
{
cin >> g[i][j];
}
}
int flag = 1;
for (int i = 1;i < n;i++)
{
for (int j = i + 1;j <= n;j++)
{
w[flag].x = i;
w[flag].y = j;
w[flag].jl = g[i][j];
flag++;
}
}
sort(w + 1, w + flag, cmp);
long long ans = 0;
int cnt = 1;
for (int i = 1;i <= flag;i++)
{
int x = find(w[i].x);
int y = find(w[i].y);
if (x != y)
{
cnt++;
ans += w[i].jl;
unity(x, y);
}
if (cnt == n)
{
cout << ans << endl;
return 0;
}
}
return 0;
}
cpp复制代码
#include<iostream>
#include<cstring>
#include<algorithm>
#include<vector>
#include<queue>
using namespace std;
int n, m, s;
int const N = 100010;
int dis[N];
bool vis[N];
struct edge
{
int u;
int v;
int w;
};
struct node
{
int number;
int dis;
bool operator < (const node& x)const { return x.dis < dis; }
};
vector<edge>vt[N];
priority_queue<node>q;
void dijkstra()
{
memset(dis, 0x3f, sizeof(dis));
dis[s] = 0;
q.push({ s,0 });
while (!q.empty())
{
int x = q.top().number;
q.pop();
if (vis[x])continue;
vis[x] = true;
for (vector<edge>::iterator it = vt[x].begin();it != vt[x].end();it++)
{
int p = (*it).v;
if (vis[p])continue;
if (dis[p] > dis[x] + (*it).w)
{
dis[p] = dis[x] + (*it).w;
q.push({ p,dis[x] + (*it).w });
}
}
}
}
int main()
{
cin >> n >> m >> s;
edge e;
for (int i = 1;i <= m;i++)
{
cin >> e.u >> e.v >> e.w;
vt[e.u].push_back(e);
}
dijkstra();
for (int i = 1;i <= n;i++)
{
cout << dis[i] << " ";
}
return 0;
}
