Submission #1183755

#	Time	Username	Problem	Language	Result	Execution time	Memory
1183755		swishy123	Jakarta Skyscrapers (APIO15_skyscraper)	C++20	0 / 100	0 ms	328 KiB

skyscraper

#include <iostream>
#include <algorithm>
#include <vector>
#include <random>
#include <chrono>
#include <set>
#include <map>
#include <stack>
#include <functional>
#include <iomanip>
#include <queue>
#include <cassert>
#include <complex>
#include <cstring>
#include <memory>
#include <bitset>
#include <sstream>
#include <cmath>
#include <numeric>
#include <numbers>
#include <fstream>

using namespace std;

#ifndef template
#ifndef define
 
#define ll long long
#define ld long double
#define pl pair<ll, ll>
#define pi pair<int, int>
#define nl cout << '\n';
#define x first
#define y second 
#define cbit(x) __builtin_popcountll(x)
#define uid(a, b) uniform_int_distribution<ll>(a, b)(rng) 
#define siz(x) (int)x.size()
 
#endif
 
#ifndef print
void print(size_t x) {cout << x << ' ';}
void print(int x) {cout << x << ' ';}
void print(long long x) {cout << x << ' ';}
void print(float x) {cout << x << ' ';}
void print(long double x) {cout << x << ' ';}
void print(char x) {cout << x << ' ';}
void print(const char* x) {cout << x << ' ';}
void print(bool x) {cout << x << ' ';}
void print(string &x) {cout << x << ' ';}
 
template<typename T, typename V>
void print(pair<T, V> &p) {print(p.x); print(p.y);}
template<typename T>
void print(vector<T> v) {for (int i = 0; i < v.size(); i++) print(v[i]);}
template<typename T>
void print(vector<vector<T>> v) {
    for (int i = 0; i < v.size(); i++){
        for (int j = 0; j < v[i].size(); j++)
            print(v[i][j]);
        nl;
    }
}
template <typename T, typename... V>
void print(T t, V&&... v) {print(t); print(v...);}
 
#endif
 
#ifndef read
void read(int &x) {cin >> x;}
void read(long long &x) {cin >> x;}
void read(unsigned &x) {cin >> x;}
void read(unsigned long long &x) {cin >> x;}
void read(float &x) {cin >> x;}
void read(long double &x) {cin >> x;}
void read(char &x) {cin >> x;}
void read(string &x) {cin >> x;}
void read(bool &x) {cin >> x;}
 
template<typename T> 
void read(vector<T> &v) {
    for (int i = 0; i < v.size(); i++)
        read(v[i]);
}
template <typename T, typename... V>
void read(T &t, V&... v) {read(t); read(v...);}
#endif
 
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
template<class T> bool maxi(T& a, const T& b) {
    return a < b ? a = b, 1 : 0;
}
template<class T> bool mini(T& a, const T& b) {
    return a > b ? a = b, 1 : 0;
}
template<class... Args>
auto vec(size_t n, Args&&... args) {
    if constexpr(sizeof...(args) == 1)
        return vector(n, args...);
    else
        return vector(n, vec(args...));
}

#endif

using namespace std;
const int inf = 1e9;
const ll def = 1e7+1;
const ll mod = 998244353;

void solve(){  
    int n, m;
    read(n, m);

    int block = sqrt(n);
    auto dp = vec(2 * n, block + 1, inf);

    auto edg = vec(2 * n, block + 1, vector<pair<int, pi>>());
    for (int i = 0; i < m; i++){
        int u, x;
        read(u, x);

        if (x <= block)
            edg[u][0].push_back({0, {u + n, x}});
        else{
            for (int j = u; (j + x) < n; j += x)
                edg[j][0].push_back({(j - u) / x + 1, {j + x, 0}});
            for (int j = u; (j - x) >= 0; j -= x)
                edg[j][0].push_back({(u - j) / x + 1, {j - x, 0}});
        }
    }
    for (int i = 0; i < n; i++) for (int j = 1; j <= block; j++){
        edg[i + n][j].push_back({0, {i, 0}});
        int u = i + j;
        if (u >= n)
            continue;
        edg[i + n][j].push_back({1, {u + n, j}});
        edg[u + n][j].push_back({1, {i + n, j}});
    }
    priority_queue<pair<int, pi>, vector<pair<int, pi>>, greater<pair<int, pi>>> pq;
    dp[0][0] = 0;

    pq.push({0, {0, 0}});
    while (pq.size()){
        int dis = pq.top().x;
        auto [u, x] = pq.top().y;
        pq.pop();

        if (dis > dp[u][x])
            continue;
        for (auto [w, it] : edg[u][x]){
            auto [v, y] = it;
            int ndis = dis + w;

            if (ndis < dp[v][y]){
                dp[v][y] = ndis;
                pq.push({ndis, {v, y}}); 
            }
        }
    }
    int res = dp[1][0];
    if (res == inf)
        res = -1;
    print(res);
}       

/*
*/

int32_t main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);

    if (ifstream("input.txt").good()){
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    }

    int t;  
    t = 1;

    while (t--){
        solve();
        nl;
    }
}

Compilation message (stderr)

skyscraper.cpp: In function 'int32_t main()':
skyscraper.cpp:175:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  175 |         freopen("input.txt", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
skyscraper.cpp:176:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  176 |         freopen("output.txt", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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