Submission #680167

#	Time	Username	Problem	Language	Result	Execution time	Memory
680167		Do_you_copy	Jakarta Skyscrapers (APIO15_skyscraper)	C++17	100 / 100	642 ms	7652 KiB

skyscraper

//Then
#include <bits/stdc++.h>
#define pb push_back
#define fi first
#define se second
#define faster ios_base::sync_with_stdio(0); cin.tie(0);

using namespace std;
using ll = long long;
using ld = long double;
using pii = pair <int, int>;
mt19937_64 Rand(chrono::steady_clock::now().time_since_epoch().count());
const int maxN = 1e5 + 1;
//const int Mod = 1e9 + 7;
//const int inf =
int n, m;
int d[maxN];
vector <int> S[maxN];
int s, t;
void Init(){
    cin >> n >> m;
    for (int i = 1; i <= m; ++i){
        int x, y;
        cin >> x >> y;
        S[x].pb(y);
        if (i == 1) s = x;
        if (i == 2) t = x;
    }
    for (int i = 0; i < n; ++i){
        sort(S[i].begin(), S[i].end());
        S[i].resize(unique(S[i].begin(), S[i].end()) - S[i].begin());
    }
    priority_queue <pii, vector <pii>, greater <pii>> PQ;
    memset(d, 0x3f, sizeof(d));
    PQ.push({0, s});
    d[s] = 0;
    while (!PQ.empty()){
        auto u = PQ.top(); PQ.pop();
        if (u.fi != d[u.se]) continue;
        for (int j: S[u.se]){
            for (int i = 1; u.se + i * j < n; ++i){
                if (d[u.se + i * j] <= d[u.se] + i) continue;
                d[u.se + i * j] = d[u.se] + i;
                PQ.push({d[u.se] + i, u.se + i * j});
            }
            for (int i = 1; u.se - i * j >= 0; ++i){
                if (d[u.se - i * j] <= d[u.se] + i) continue;
                d[u.se - i * j] = d[u.se] + i;
                PQ.push({d[u.se] + i, u.se - i * j});
            }
        }
    }
    cout << (d[t] == 0x3f3f3f3f ? -1 : d[t]);
}

#define debug
#define taskname "test"
signed main(){
    faster
    if (fopen(taskname".inp", "r")){
        freopen(taskname".inp", "r", stdin);
        freopen(taskname".out", "w", stdout);
    }
    int tt = 1;
    //cin >> tt;
    while (tt--){
        Init();
    }
    if (fopen("timeout.txt", "r")){
        ofstream timeout("timeout.txt");
        timeout << signed(double(clock()) / CLOCKS_PER_SEC * 1000);
        timeout.close();
        #ifndef debug
        cerr << "Time elapsed: " << signed(double(clock()) / CLOCKS_PER_SEC * 1000) << "ms\n";
        #endif // debug
    }
}

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:61:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   61 |         freopen(taskname".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
skyscraper.cpp:62:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   62 |         freopen(taskname".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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