Submission #400518

#	Time	Username	Problem	Language	Result	Execution time	Memory
400518		Falcon	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	0 / 100	1 ms	204 KiB

skyscraper

#pragma GCC optimize("O2")

#include <bits/stdc++.h>

#ifdef DEBUG
#include "debug.hpp"
#endif

using namespace std;

#define all(c)              (c).begin(), (c).end()
#define rall(c)             (c).rbegin(), (c).rend()
#define traverse(c, it)     for(auto it = (c).begin(); it != (c).end(); ++it)
#define rep(i, N)           for(int i = 0; i < (N); ++i)
#define rrep(i, N)          for(int i = (N) - 1; i >= 0; --i)
#define rep1(i, N)          for(int i = 1; i <= (N); ++i)
#define rep2(i, s, e)       for(int i = (s); i <= (e); ++i)
#define rep3(i, s, e, d)    for(int i = (s); (d) >= 0 ? i <= (e) : i >= (e); i += (d))

#ifdef DEBUG
#define debug(x...)         { \
                            ++dbg::depth; \
                            string dbg_vals = dbg::to_string(x); \
                            --dbg::depth; \
                            dbg::fprint(__func__, __LINE__, #x, dbg_vals); \
                            }

#define light_debug(x)      { \
                            dbg::light = true; \
                            dbg::dout << __func__ << ":" << __LINE__; \
                            dbg::dout << "  " << #x << " = " << x << endl; \
                            dbg::light = false; \
                            }
#else
#define debug(x...)         42
#define light_debug(x)      42
#endif


using ll = long long;

template<typename T>
inline T& ckmin(T& a, T b) { return a = a > b ? b : a; }

template<typename T>
inline T& ckmax(T& a, T b) { return a = a < b ? b : a; }


int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    
    #ifdef DEBUG
    freopen("debug", "w", stderr);
    #endif

    int N, M; cin >> N >> M;
    vector<int> P(M), B(M);
    rep(i, M) cin >> B[i] >> P[i];
    vector<vector<int>> B_t(N);
    rep(i, M) B_t[B[i]].push_back(i);

    vector<int> dist(M, INT_MAX); dist[0] = 0;
    vector<bool> vis(M);
    set<pair<int, int>> dijkstra;
    rep(i, M) dijkstra.insert({dist[i], i});

    while(!vis[1] && !dijkstra.empty()){
        auto [d, u] = *dijkstra.begin(); dijkstra.erase(dijkstra.begin());
        if(vis[u]) continue;
        vis[u] = true;
        for(int p = B[u] % P[u]; p < N; p += P[u]) {
            debug(u, p);
            for(int v : B_t[p])
                if(!vis[v]) {
                    int dv = d + abs(p - B[u]) / P[u];
                    if(dist[v] > dv) {
                        dijkstra.erase({dist[v], v});
                        dijkstra.insert({dv, v});
                        dist[v] = dv;
                    }
                }
        }
    }

    
    cout << (vis[1] ? dist[1] : -1) << '\n';

    #ifdef DEBUG
    dbg::dout << "\nExecution time: " << clock() * 1000 / CLOCKS_PER_SEC  << "ms" << endl;
    #endif

    return 0;
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:35:29: warning: statement has no effect [-Wunused-value]
   35 | #define debug(x...)         42
      |                             ^~
skyscraper.cpp:73:13: note: in expansion of macro 'debug'
   73 |             debug(u, p);
      |             ^~~~~

• Subtask 1: 0 / 10
• Subtask 2: 0 / 12
• Subtask 3: 0 / 14
• Subtask 4: 0 / 21
• Subtask 5: 0 / 43