Submission #836778

#	Time	Username	Problem	Language	Result	Execution time	Memory
836778		TS_2392	Robot (JOI21_ho_t4)	C++17	0 / 100	1008 ms	114844 KiB

Main

#include <bits/stdc++.h>

using namespace std;

#define fileIO(name)  if(fopen(name".inp", "r")) {freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout);}
#define SPEED         ios_base :: sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define EL            cout << '\n'
#define dbg(x)        cout << #x << " = " << (x) << ' '
#define dbgp(x)       cout << #x << " = (" << (x.fi) << ", " << (x.se) << ") "
#define dbga(x, l, r) {cout << #x << '[' << l << ", " << r << "] = { "; for(int i = l; i <= (int)r; ++i) cout << x[i] << ' '; cout << "} ";}

#define epl           emplace
#define pb            push_back
#define eb            emplace_back
#define fi            first
#define se            second
#define mp            make_pair

typedef long long            ll;
typedef pair<int, int>       pii;

template<class T1, class T2> bool minimize(T1 &a, T2 b){return a > b ? a = b, true : false;}
template<class T1, class T2> bool maximize(T1 &a, T2 b){return a < b ? a = b, true : false;}

const int N = 1e5 + 3;
const ll oo = 1e17;
int n, m;
struct adjNode{
    pii v;
    int c, p;
};
map< int, ll > sump[N], d[N];
map< int, vector<adjNode> > adj[N];
priority_queue< pair<ll, pii>, vector< pair<ll, pii> >, greater< pair<ll, pii> > > pq;
void add_edge(pii a, pii b, int c, int p){
    adj[a.fi][a.se].pb({b, c, p});
    adj[b.fi][b.se].pb({a, c, p});
}
int main(){
    SPEED; fileIO("text");
    cin >> n >> m;
    for(int i = 1; i <= m; ++i){
        int u, v, c, p;
        cin >> u >> v >> c >> p;
        add_edge({u, 0}, {v, 0}, c, p);
        add_edge({u, 0}, {v, c}, c, p);
        add_edge({u, c}, {v, 0}, c, p);
    }
    for(int u = 1; u <= n; ++u){
        //dbg(u); EL;
        for(auto &[c, x] : adj[u]){
            ll tot = 0;
            for(auto e : x) tot += e.p;
            d[u][c] = oo; sump[u][c] = tot;
            //dbg(c); dbg(sump[u][c]); EL;
        }
    }
    d[1][0] = 0; pq.epl(0, mp(1, 0));
    while(!pq.empty()){
        ll dist = pq.top().fi;
        int u, x; tie(u, x) = pq.top().se;
        pq.pop();
        if(dist != d[u][x]) continue;
        for(auto &[b, c, p] : adj[u][x]){
            int v, y; tie(v, y) = b;
            if(x == 0){
                if(!y && minimize(d[v][y], d[u][x] + min(1LL * p, sump[u][c] - p))) pq.epl(d[v][y], mp(v, y));
                else if(y && minimize(d[v][y], d[u][x])) pq.epl(d[v][y], mp(v, y));
            }
            else if(!y && minimize(d[v][y], d[u][x] + sump[u][x] - p)) pq.epl(d[v][y], mp(v, y));
        }
    }
    cout << (d[n][0] == oo ? -1 : d[n][0]);
    return 0;
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:5:58: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | #define fileIO(name)  if(fopen(name".inp", "r")) {freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout);}
      |                                                   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:40:12: note: in expansion of macro 'fileIO'
   40 |     SPEED; fileIO("text");
      |            ^~~~~~
Main.cpp:5:91: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | #define fileIO(name)  if(fopen(name".inp", "r")) {freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout);}
      |                                                                                    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Main.cpp:40:12: note: in expansion of macro 'fileIO'
   40 |     SPEED; fileIO("text");
      |            ^~~~~~

• Subtask 1: 0 / 34
• Subtask 2: 0 / 24
• Subtask 3: 0 / 42