Task: | Tunnels |
Sender: | herkar |
Submission time: | 2017-01-22 18:31:58 +0200 |
Language: | C++ |
Status: | READY |
Result: | 100 |
group | verdict | score |
---|---|---|
#1 | ACCEPTED | 16 |
#2 | ACCEPTED | 31 |
#3 | ACCEPTED | 53 |
test | verdict | time | group | |
---|---|---|---|---|
#1 | ACCEPTED | 0.04 s | 1 | details |
#2 | ACCEPTED | 0.06 s | 1 | details |
#3 | ACCEPTED | 0.04 s | 1 | details |
#4 | ACCEPTED | 0.05 s | 1 | details |
#5 | ACCEPTED | 0.04 s | 1 | details |
#6 | ACCEPTED | 0.04 s | 2 | details |
#7 | ACCEPTED | 0.03 s | 2 | details |
#8 | ACCEPTED | 0.04 s | 2 | details |
#9 | ACCEPTED | 0.04 s | 2 | details |
#10 | ACCEPTED | 0.03 s | 2 | details |
#11 | ACCEPTED | 0.17 s | 3 | details |
#12 | ACCEPTED | 0.10 s | 3 | details |
#13 | ACCEPTED | 0.08 s | 3 | details |
#14 | ACCEPTED | 0.07 s | 3 | details |
#15 | ACCEPTED | 0.06 s | 3 | details |
Code
#include <functional> #include <algorithm> #include <iostream> #include <string> #include <vector> #include <cmath> #include <queue> #include <stack> #include <list> #include <set> #include <map> using namespace std; #define rep(i,a,b) for(int i = (a); i < int(b); ++i) #define rrep(i,a,b) for(int i = (b); i --> int(a); ) #define trav(i,v) for(auto&i:v) #define all(c) (c).begin(), (c).end() #define sz(c) int((c).size()) #define vcr(v,n) vi v(n); trav(var,v) cin >> var; typedef long long ll; typedef vector<int> vi; typedef pair<int,int> pii; int main(){ cin.tie(0); cin.sync_with_stdio(0); int n,m; cin >> n >> m; vector<bool> used(m); vector<vector<pii>> in(n), out(n); vi inc(n),outc(n); rep(i,0,m){ int u,v; cin >> u >> v; in[--v].push_back({--u,i}); out[ u].push_back({ v,i}); ++inc[v], ++outc[u]; } int ans = 0; function <void(int)> up = [&](int u){ while(in[u].size() && used[in[u].back().second]) in[u].pop_back(); if(in[u].empty()) return; pii e = in[u].back(); used[e.second] = 1; in[u].pop_back(); --inc[u], --outc[e.first]; up(e.first); }, dn = [&](int u){ while(out[u].size() && used[out[u].back().second]) out[u].pop_back(); if(out[u].empty()) return; pii e = out[u].back(); used[e.second] = 1; out[u].pop_back(); --outc[u], --inc[e.first]; dn(e.first); }; rep(i,0,n) while(inc[i]+outc[i]) up(i),dn(i),++ans; cout << ans << endl; }
Test details
Test 1
Group: 1
Verdict: ACCEPTED
input |
---|
10 20 4 5 6 4 5 1 5 9 ... |
correct output |
---|
11 |
user output |
---|
11 |
Test 2
Group: 1
Verdict: ACCEPTED
input |
---|
10 10 7 3 5 2 9 7 1 5 ... |
correct output |
---|
5 |
user output |
---|
5 |
Test 3
Group: 1
Verdict: ACCEPTED
input |
---|
10 5 5 7 3 8 5 8 3 7 ... |
correct output |
---|
4 |
user output |
---|
4 |
Test 4
Group: 1
Verdict: ACCEPTED
input |
---|
10 4 9 1 6 8 7 1 5 7 |
correct output |
---|
3 |
user output |
---|
3 |
Test 5
Group: 1
Verdict: ACCEPTED
input |
---|
10 2 10 6 2 1 |
correct output |
---|
2 |
user output |
---|
2 |
Test 6
Group: 2
Verdict: ACCEPTED
input |
---|
100 200 24 40 25 6 36 93 92 90 ... |
correct output |
---|
97 |
user output |
---|
97 |
Test 7
Group: 2
Verdict: ACCEPTED
input |
---|
100 100 98 37 91 37 60 92 46 27 ... |
correct output |
---|
60 |
user output |
---|
60 |
Test 8
Group: 2
Verdict: ACCEPTED
input |
---|
100 50 74 95 53 72 69 85 14 13 ... |
correct output |
---|
34 |
user output |
---|
34 |
Test 9
Group: 2
Verdict: ACCEPTED
input |
---|
100 40 28 76 10 81 13 52 46 83 ... |
correct output |
---|
29 |
user output |
---|
29 |
Test 10
Group: 2
Verdict: ACCEPTED
input |
---|
100 20 27 35 72 92 56 4 64 80 ... |
correct output |
---|
18 |
user output |
---|
18 |
Test 11
Group: 3
Verdict: ACCEPTED
input |
---|
100000 200000 89244 59358 22943 56710 63331 89437 56581 38400 ... |
correct output |
---|
102510 |
user output |
---|
102510 |
Test 12
Group: 3
Verdict: ACCEPTED
input |
---|
100000 100000 21701 85599 61542 21474 38081 29362 46316 64038 ... |
correct output |
---|
60593 |
user output |
---|
60593 |
Test 13
Group: 3
Verdict: ACCEPTED
input |
---|
100000 50000 86469 4833 16351 35505 59315 33011 95464 16985 ... |
correct output |
---|
35933 |
user output |
---|
35933 |
Test 14
Group: 3
Verdict: ACCEPTED
input |
---|
100000 40000 5392 23534 63204 45619 74330 25925 59678 88427 ... |
correct output |
---|
30074 |
user output |
---|
30074 |
Test 15
Group: 3
Verdict: ACCEPTED
input |
---|
100000 20000 80156 16531 71753 77661 7028 33389 17168 646 ... |
correct output |
---|
16882 |
user output |
---|
16882 |