oj.uz

답안 #1112313

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1112313 2024-11-14T03:53:29 Z luvna Construction Project 2 (JOI24_ho_t2) C++14
8 / 100
 135 ms 26936 KB 
#include<bits/stdc++.h>

#define all(v) v.begin(), v.end()
#define endl "\n"
#define int long long

using namespace std;

typedef long long ll;

const int N = 2e5 + 15;

int n, m, S, T;
ll L, limit;
vector<pair<int,int>> g[N];
vector<ll> distS, distT;

void dijk(vector<ll>& dist, int root){
    dist.resize(N, LLONG_MAX);
    dist[root] = 0;
    priority_queue<pair<ll,int>, vector<pair<ll,int>>, greater<pair<ll,int>>> pq;
    pq.push({0,root});
    while(!pq.empty()){
        ll wu; int u; tie(wu, u) = pq.top(); pq.pop();
        if(wu > dist[u]) continue;
        for(auto [v, wv] : g[u]){
            if(dist[v] > dist[u] + wv){
                dist[v] = dist[u] + wv;
                pq.push({dist[v],v});
            }
        }
    }
}

void solve(){
    cin >> n >> m;

    cin >> S >> T >> L >> limit;

    for(int i = 1; i <= m; i++){
        int u, v, w; cin >> u >> v >> w;
        g[u].push_back({v,w});
        g[v].push_back({u,w});
    }

    dijk(distS, S);
    dijk(distT, T);

    if(distS[T] <= limit){//match whatever
        cout << 1LL*n*(n-1) / 2;
        return;
    }

    ll ans = 0;

    vector<ll> A, B;

    //a + b + L <= limit
    //a <= limit - L - b
    //sort a decrease, sort b increase -> greed

    for(int i = 1; i <= n; i++){
        A.push_back(distS[i]);
        B.push_back(distT[i]);
    }

    sort(all(A)); sort(all(B), greater<ll>());

    for(int i = 0,j = 0; i < B.size(); i++){
        while(j < A.size() && A[j] <= limit - L - B[i]) j++;
        ans += j;
    }

    cout << ans;
}

signed main(){
    ios_base::sync_with_stdio(NULL);
    cin.tie(0); cout.tie(0);

    #define task "task"

    if(fopen(task".INP", "r")){
        freopen(task".INP", "r", stdin);
        freopen(task".OUT", "w", stdout);
    }

    int t; t = 1; //cin >> t;
    while(t--) solve();
}

Compilation message

Main.cpp: In function 'void dijk(std::vector<long long int>&, long long int)':
Main.cpp:26:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   26 |         for(auto [v, wv] : g[u]){
      |                  ^
Main.cpp: In function 'void solve()':
Main.cpp:69:28: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   69 |     for(int i = 0,j = 0; i < B.size(); i++){
      |                          ~~^~~~~~~~~~
Main.cpp:70:17: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   70 |         while(j < A.size() && A[j] <= limit - L - B[i]) j++;
      |               ~~^~~~~~~~~~
Main.cpp: In function 'int main()':
Main.cpp:84:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   84 |         freopen(task".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:85:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   85 |         freopen(task".OUT", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
8.0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 8272 KB Output is correct
2 Correct 3 ms 8272 KB Output is correct
3 Correct 3 ms 8272 KB Output is correct
4 Correct 4 ms 8272 KB Output is correct
5 Correct 4 ms 8528 KB Output is correct
6 Correct 4 ms 8528 KB Output is correct
7 Correct 66 ms 22272 KB Output is correct
8 Correct 69 ms 22856 KB Output is correct
9 Correct 63 ms 21168 KB Output is correct
10 Correct 4 ms 8272 KB Output is correct
11 Correct 4 ms 8272 KB Output is correct
12 Correct 4 ms 8272 KB Output is correct
13 Correct 5 ms 8292 KB Output is correct
14 Correct 39 ms 18784 KB Output is correct
15 Correct 135 ms 23980 KB Output is correct
16 Correct 4 ms 8272 KB Output is correct
17 Correct 4 ms 8272 KB Output is correct
18 Correct 77 ms 22880 KB Output is correct
19 Correct 4 ms 8440 KB Output is correct
20 Correct 3 ms 8272 KB Output is correct
21 Correct 4 ms 8284 KB Output is correct
22 Correct 5 ms 8528 KB Output is correct
23 Correct 39 ms 18792 KB Output is correct
24 Correct 133 ms 23956 KB Output is correct
25 Correct 4 ms 8272 KB Output is correct
26 Correct 4 ms 8528 KB Output is correct
27 Correct 73 ms 26936 KB Output is correct
28 Correct 58 ms 20648 KB Output is correct
29 Correct 63 ms 21940 KB Output is correct

Subtask #2
0.0 / 16.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 8272 KB Output is correct
2 Correct 4 ms 8272 KB Output is correct
3 Incorrect 4 ms 8272 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #3
0.0 / 29.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 8272 KB Output is correct
2 Correct 4 ms 8272 KB Output is correct
3 Incorrect 4 ms 8272 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #4
0.0 / 47.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 8272 KB Output is correct
2 Correct 3 ms 8272 KB Output is correct
3 Correct 3 ms 8272 KB Output is correct
4 Correct 4 ms 8272 KB Output is correct
5 Correct 4 ms 8528 KB Output is correct
6 Correct 4 ms 8528 KB Output is correct
7 Correct 66 ms 22272 KB Output is correct
8 Correct 69 ms 22856 KB Output is correct
9 Correct 63 ms 21168 KB Output is correct
10 Correct 4 ms 8272 KB Output is correct
11 Correct 4 ms 8272 KB Output is correct
12 Correct 4 ms 8272 KB Output is correct
13 Correct 5 ms 8292 KB Output is correct
14 Correct 39 ms 18784 KB Output is correct
15 Correct 135 ms 23980 KB Output is correct
16 Correct 4 ms 8272 KB Output is correct
17 Correct 4 ms 8272 KB Output is correct
18 Correct 77 ms 22880 KB Output is correct
19 Correct 4 ms 8440 KB Output is correct
20 Correct 3 ms 8272 KB Output is correct
21 Correct 4 ms 8284 KB Output is correct
22 Correct 5 ms 8528 KB Output is correct
23 Correct 39 ms 18792 KB Output is correct
24 Correct 133 ms 23956 KB Output is correct
25 Correct 4 ms 8272 KB Output is correct
26 Correct 4 ms 8528 KB Output is correct
27 Correct 73 ms 26936 KB Output is correct
28 Correct 58 ms 20648 KB Output is correct
29 Correct 63 ms 21940 KB Output is correct
30 Correct 4 ms 8272 KB Output is correct
31 Correct 4 ms 8272 KB Output is correct
32 Incorrect 4 ms 8272 KB Output isn't correct
33 Halted 0 ms 0 KB -