Submission #447923

#	Time	Username	Problem	Language	Result	Execution time	Memory
447923		idas	Toll (BOI17_toll)	C++17	0 / 100	3079 ms	2124 KiB

toll

#include <bits/stdc++.h>
#define FOR(i, begin, end) for(int i = (begin); i < (end); i++)
#define FAST_IO ios_base::sync_with_stdio(0); cin.tie(nullptr); cout.tie(nullptr)
#define F first
#define S second
#define PB push_back
#define MP make_pair
#define SZ(x) ((int)((x).size()))
#define LE(vec) vec[vec.size()-1]
#define TSTS int t; cin >> t; while(t--)solve()

const int INF = 1e9;
const long long LINF = 1e18;
const long double PI = asin(1)*2;
const int MOD = 1e9+7;

using namespace std;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef map<int, int> mii;
typedef long long ll;
typedef long double ld;

void setIO()
{
    FAST_IO;
}

void setIO (string s) {
    setIO();
 	freopen((s+".in").c_str(),"r",stdin);
 	freopen((s+".out").c_str(),"w",stdout);
}

const int N=1e4+10;

int k, n, m, o, ans[N];
vector<pii> ad[N];
set<int> que[N];

void dfs(int u, int tot, set<int> ar)
{
    for(auto it : que[u]){
        if(ar.count(it)){
            ans[it]=min(ans[it], tot);
        }
        else{
            ar.insert(it);
        }
    }

    for(auto [x, w]: ad[u]){
        dfs(x, tot+w, ar);
    }
}

int main()
{
    setIO();
    cin >> k >> n >> m >> o;
    FOR(i, 0, m)
    {
        int a, b, c;
        cin >> a >> b >> c;
        ad[a].PB({b, c});
    }

    set<int> st;
    FOR(i, 0, o)
    {
        int a, b;
        cin >> a >> b;
        que[a].insert(i+1);
        que[b].insert(i+1);
        st.insert(a);
    }

    fill(ans, ans+o+1, INF);

    for(auto it : st){
        set<int> mt;
        dfs(it, 0, mt);
    }

    FOR(i, 1, o+1)
    {
        cout << (ans[i]==INF?-1:ans[i]) << "\n";
    }
}

Compilation message (stderr)

toll.cpp: In function 'void setIO(std::string)':
toll.cpp:31:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |   freopen((s+".in").c_str(),"r",stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
toll.cpp:32:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |   freopen((s+".out").c_str(),"w",stdout);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 7
• Subtask 2: 0 / 10
• Subtask 3: 0 / 8
• Subtask 4: 0 / 31
• Subtask 5: 0 / 44