oj.uz

답안 #1112309

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
1112309 2024-11-14T03:47:35 Z luvna Construction Project 2 (JOI24_ho_t2) C++14
8 / 100
 127 ms 26588 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, 0x3f);
    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), greater<ll>()); sort(all(B));

    for(int i = 0,j = 0; i < A.size(); i++){
        while(j < B.size() && B[j] <= limit - L - A[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 < A.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 < B.size() && B[j] <= limit - L - A[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 4 ms 8272 KB Output is correct
3 Correct 6 ms 8272 KB Output is correct
4 Correct 6 ms 8272 KB Output is correct
5 Correct 4 ms 8528 KB Output is correct
6 Correct 5 ms 8272 KB Output is correct
7 Correct 61 ms 22228 KB Output is correct
8 Correct 81 ms 22260 KB Output is correct
9 Correct 65 ms 21176 KB Output is correct
10 Correct 4 ms 8272 KB Output is correct
11 Correct 4 ms 8272 KB Output is correct
12 Correct 5 ms 8272 KB Output is correct
13 Correct 5 ms 8528 KB Output is correct
14 Correct 37 ms 18692 KB Output is correct
15 Correct 119 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 56 ms 22968 KB Output is correct
19 Correct 4 ms 8272 KB Output is correct
20 Correct 4 ms 8272 KB Output is correct
21 Correct 4 ms 8288 KB Output is correct
22 Correct 6 ms 8528 KB Output is correct
23 Correct 42 ms 18696 KB Output is correct
24 Correct 127 ms 23976 KB Output is correct
25 Correct 4 ms 8272 KB Output is correct
26 Correct 5 ms 8528 KB Output is correct
27 Correct 84 ms 26588 KB Output is correct
28 Correct 59 ms 20648 KB Output is correct
29 Correct 46 ms 21936 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 Correct 3 ms 8272 KB Output is correct
4 Incorrect 3 ms 8272 KB Output isn't correct
5 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 Correct 3 ms 8272 KB Output is correct
4 Incorrect 3 ms 8272 KB Output isn't correct
5 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 4 ms 8272 KB Output is correct
3 Correct 6 ms 8272 KB Output is correct
4 Correct 6 ms 8272 KB Output is correct
5 Correct 4 ms 8528 KB Output is correct
6 Correct 5 ms 8272 KB Output is correct
7 Correct 61 ms 22228 KB Output is correct
8 Correct 81 ms 22260 KB Output is correct
9 Correct 65 ms 21176 KB Output is correct
10 Correct 4 ms 8272 KB Output is correct
11 Correct 4 ms 8272 KB Output is correct
12 Correct 5 ms 8272 KB Output is correct
13 Correct 5 ms 8528 KB Output is correct
14 Correct 37 ms 18692 KB Output is correct
15 Correct 119 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 56 ms 22968 KB Output is correct
19 Correct 4 ms 8272 KB Output is correct
20 Correct 4 ms 8272 KB Output is correct
21 Correct 4 ms 8288 KB Output is correct
22 Correct 6 ms 8528 KB Output is correct
23 Correct 42 ms 18696 KB Output is correct
24 Correct 127 ms 23976 KB Output is correct
25 Correct 4 ms 8272 KB Output is correct
26 Correct 5 ms 8528 KB Output is correct
27 Correct 84 ms 26588 KB Output is correct
28 Correct 59 ms 20648 KB Output is correct
29 Correct 46 ms 21936 KB Output is correct
30 Correct 4 ms 8272 KB Output is correct
31 Correct 4 ms 8272 KB Output is correct
32 Correct 3 ms 8272 KB Output is correct
33 Incorrect 3 ms 8272 KB Output isn't correct
34 Halted 0 ms 0 KB -