Submission #1073879

#TimeUsernameProblemLanguageResultExecution timeMemory
1073879RiverFlowJakarta Skyscrapers (APIO15_skyscraper)C++14
100 / 100
897 ms3792 KiB
#include <bits/stdc++.h> #define nl "\n" #define no "NO" #define yes "YES" #define fi first #define se second #define vec vector #define task "main" #define _mp make_pair #define ii pair<int, int> #define sz(x) (int)x.size() #define all(x) x.begin(), x.end() #define evoid(val) return void(std::cout << val) #define FOR(i, a, b) for(int i = (a); i <= (b); ++i) #define FOD(i, b, a) for(int i = (b); i >= (a); --i) #define unq(x) sort(all(x)); x.resize(unique(all(x)) - x.begin()) using namespace std; template<typename U, typename V> bool maxi(U &a, V b) { if (a < b) { a = b; return 1; } return 0; } template<typename U, typename V> bool mini(U &a, V b) { if (a > b) { a = b; return 1; } return 0; } const int N = (int)3e4 + 9; const int mod = (int)1e9 + 7; void prepare(); void main_code(); int main() { ios::sync_with_stdio(0); cin.tie(0); cout.tie(0); if (fopen(task".inp", "r")) { freopen(task".inp", "r", stdin); freopen(task".out", "w", stdout); } const bool MULTITEST = 0; prepare(); int num_test = 1; if (MULTITEST) cin >> num_test; while (num_test--) { main_code(); } } void prepare() {}; int dis[N]; vector<int> g[N]; void main_code() { int n, m; cin >> m >> n; int p0 = 0, pos = 0, ed = 0; for(int i = 0; i < n; ++i) { int b, p; cin >> b >> p; if (i == 0) { p0 = p; pos = b; g[pos].push_back(p); } else if (i == 1) { ed = b; } else { g[b].push_back(p); } } FOR(i, 0, m - 1) dis[i] = -1; // (0, m - 1) priority_queue<ii, vec<ii>, greater<ii>> pq; pq.push(_mp(0, pos)); dis[pos] = 0; while (!pq.empty()) { auto x = pq.top(); pq.pop(); int u = x.second; if (dis[u] != x.fi) continue ; if (u == ed) break ; for(int v : g[u]) { for(int k = u - v, c = 1; k >= 0; k -= v, ++c) { if (dis[k] == -1 or dis[k] > dis[u] + c) { dis[k] = dis[u] + c; pq.push(_mp(dis[k], k)); } } for(int k = u + v, c = 1; k < m; k += v, ++c) { if (dis[k] == -1 or dis[k] > dis[u] + c) { dis[k] = dis[u] + c; pq.push(_mp(dis[k], k)); } } } } cout << dis[ed]; } /* Let the river flows naturally */

Compilation message (stderr)

skyscraper.cpp: In function 'void main_code()':
skyscraper.cpp:53:9: warning: variable 'p0' set but not used [-Wunused-but-set-variable]
   53 |     int p0 = 0, pos = 0, ed = 0;
      |         ^~
skyscraper.cpp: In function 'int main()':
skyscraper.cpp:36:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
skyscraper.cpp:37:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
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