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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#760715 | #5811. Wi-fi Towers | realcomplex0 | 28 ✓ | 17ms | 3896kb | C++20 | 3.6kb | 2024-11-18 18:39:48 | 2024-11-18 18:39:49 |
Judging History
answer
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
#define fi first
#define se second
#define mp make_pair
#define fastIO ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
struct FlowEdge {
int v, u;
ll cap, flow = 0;
FlowEdge(int v, int u, ll cap) : v(v), u(u), cap(cap) {}
};
struct Dinic {
const ll flow_inf = (ll)1e18;
vector<FlowEdge> edges;
vector<vector<int>> adj;
int nn, mm = 0;
int s, t;
vector<int> level, ptr;
queue<int> q;
Dinic(int nn, int s, int t) : nn(nn), s(s), t(t) {
adj.resize(nn);
level.resize(nn);
ptr.resize(nn);
}
void add_edge(int v, int u, ll cap){
edges.push_back({v, u, cap});
edges.push_back({u, v, 0});
adj[v].push_back(mm);
adj[u].push_back(mm + 1);
mm += 2;
}
bool bfs() {
while(!q.empty()){
int v = q.front();
q.pop();
for(int id : adj[v]){
if(edges[id].cap - edges[id].flow < 1)
continue;
if(level[edges[id].u] != -1)
continue;
level[edges[id].u] = level[v] + 1;
q.push(edges[id].u);
}
}
return level[t] != -1;
}
ll dfs(int v, ll pushed){
if(pushed == 0)
return 0;
if(v == t)
return pushed;
for(int &cid = ptr[v]; cid < (int)adj[v].size(); cid ++ ){
int id = adj[v][cid];
int u = edges[id].u;
if(level[v] + 1 != level[u] || edges[id].cap - edges[id].flow < 1)
continue;
ll tr = dfs(u, min(pushed, edges[id].cap - edges[id].flow));
if(tr == 0)
continue;
edges[id].flow += tr;
edges[id ^ 1].flow -= tr;
return tr;
}
return 0;
}
ll flow(){
ll f = 0;
while(true){
fill(level.begin(), level.end(), -1);
level[s] = 0;
q.push(s);
if(!bfs())
break;
fill(ptr.begin(), ptr.end(), 0);
while(ll pushed = dfs(s, flow_inf)){
f += pushed;
}
}
return f;
}
vector<bool> vis;
void dfs_t(int node){
if(vis[node]) return;
vis[node]=true;
for(auto x : adj[node]){
if(edges[x].cap - edges[x].flow > 0){
dfs_t(edges[x].u);
}
}
}
};
const int N = (int)505;
int x[N], y[N], s[N], r[N];
void solve(int idx){
int n;
cin >> n;
Dinic dd(2 * n + 2, 0, 2 * n + 1);
int profit = 0;
for(int i = 1; i <= n; i ++ ){
cin >> x[i] >> y[i] >> r[i] >> s[i];
if(s[i] > 0){
profit += s[i];
dd.add_edge(n + i, 2 * n + 1, s[i]);
}
else if(s[i] < 0){
dd.add_edge(0, i, -s[i]);
}
dd.add_edge(i, n + i, (ll)1e18);
dd.add_edge(n + i, i, (ll)1e18);
}
for(int i = 1; i <= n; i ++ ){
for(int j = 1; j <= n; j ++ ){
if(j == i) continue;
if((x[j] - x[i]) * (x[j] - x[i]) + (y[j] - y[i]) * (y[j] - y[i]) <= (r[i] * r[i]))
dd.add_edge(n + j, i, (ll)1e18);
}
}
cout << "Case #" << idx << ": " << profit - dd.flow() << "\n";
}
int main(){
fastIO;
int tc;
cin >> tc;
for(int iq = 1; iq <= tc; iq ++ )
solve(iq);
return 0;
}
Details
Tip: Click on the bar to expand more detailed information
Subtask #1:
score: 3
Accepted
Test #1:
score: 3
Accepted
time: 1ms
memory: 3596kb
input:
55 15 10 12 45 -1 9 5 50 1 5 20 41 1 11 8 50 1 20 13 44 1 2 0 45 -1 5 4 47 -1 14 13 42 -1 19 1 47 -1 8 0 41 -1 8 16 40 -1 15 11 42 1 8 8 42 1 2 9 50 1 0 10 44 1 15 872 2191 2 -386 -2071 -3796 1 -568 4237 -5305 6742 275 -2307 -6269 1 -148 6875 -19 461 -519 -9871 -3500 64 -306 -2576 -5709 25 686 431 8...
output:
Case #1: 1 Case #2: 3091 Case #3: 923 Case #4: 651 Case #5: 1387 Case #6: 1319 Case #7: 1 Case #8: 747 Case #9: 0 Case #10: 1443 Case #11: 2 Case #12: 0 Case #13: 1746 Case #14: 1533 Case #15: 687 Case #16: 1851 Case #17: 2140 Case #18: 886 Case #19: 673 Case #20: 0 Case #21: 1772 Case #22: 0 Case #...
result:
ok 55 lines
Subtask #2:
score: 25
Accepted
Test #2:
score: 25
Accepted
time: 17ms
memory: 3896kb
input:
55 5 0 -1 7 10 0 1 7 10 5 0 1 -15 10 0 6 10 15 1 2 -20 171 46 50 3 3 30 6 8 2 14 30 8 2 10 10 8 4 48 28 1 -2 18 18 9 3 52 12 1 -2 54 6 10 4 26 54 10 4 24 36 1 -1 30 14 3 1 4 36 1 -1 40 4 1 -2 14 14 9 4 52 40 1 -3 20 48 1 -2 50 6 8 3 16 16 1 -3 10 42 3 2 50 38 7 3 44 52 1 -2 4 48 1 -2 16 52 1 -1 32 5...
output:
Case #1: 5 Case #2: 24 Case #3: 18455 Case #4: 46 Case #5: 34885 Case #6: 12211 Case #7: 4653 Case #8: 3560 Case #9: 16236 Case #10: 64 Case #11: 12885 Case #12: 18102 Case #13: 17 Case #14: 10 Case #15: 3824 Case #16: 2589 Case #17: 3949 Case #18: 1 Case #19: 0 Case #20: 28 Case #21: 40141 Case #22...
result:
ok 55 lines
Extra Test:
score: 0
Extra Test Passed