#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
template<typename T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<typename T, typename U> using ordered_map = tree<T, U, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long ll;
typedef long double ld;
typedef double db;
typedef string str;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef vector<pii> vpii;
typedef vector<pll> vpll;
typedef vector<str> vstr;
#define FOR(i,j,k,in) for(int i=(j); i < (k);i+=in)
#define FORD(i,j,k,in) for(int i=(j); i >=(k);i-=in)
#define REP(i,b) FOR(i,0,b,1)
#define REPD(i,b) FORD(i,b,0,1)
#define pb push_back
#define mp make_pair
#define ff first
#define ss second
#define all(x) begin(x), end(x)
#define rsz resize
#define MANY_TESTS int tcase; cin >> tcase; while(tcase--)
const double EPS = 1e-9;
const int MOD = 1e9+7; // 998244353;
const ll INFF = 1e18;
const int INF = 1e9;
const ld PI = acos((ld)-1);
const vi dy = {1, 0, -1, 0, -1, 1, 1, -1};
const vi dx = {0, 1, 0, -1, -1, 1, -1, 1};
#ifdef DEBUG
#define DBG if(1)
#else
#define DBG if(0)
#endif
#define dbg(x) cout << "(" << #x << " : " << x << ")" << endl;
// ostreams
template <class T, class U>
ostream& operator<<(ostream& out, const pair<T, U> &par) {out << "[" << par.first << ";" << par.second << "]"; return out;}
template <class T>
ostream& operator<<(ostream& out, const set<T> &cont) { out << "{"; for( const auto &x:cont) out << x << ", "; out << "}"; return out; }
template <class T, class U>
ostream& operator<<(ostream& out, const map<T, U> &cont) {out << "{"; for( const auto &x:cont) out << x << ", "; out << "}"; return out; }
template<class T>
ostream& operator<<(ostream& out, const vector<T> &v){ out << "["; REP(i, v.size()) out << v[i] << ", "; out << "]"; return out;}
// istreams
template<class T>
istream& operator>>(istream& in, vector<T> &v){ for(auto &x : v) in >> x; return in; }
template<class T, class U>
istream& operator>>(istream& in, pair<T, U> &p){ in >> p.ff >> p.ss; return in; }
//searches
template<typename T, typename U>
T bsl(T lo, T hi, U f){ hi++; T mid; while(lo < hi){ mid = (lo + hi)/2; f(mid) ? hi = mid : lo = mid+1; } return lo; }
template<typename U>
double bsld(double lo, double hi, U f, double p = 1e-9){ int r = 3 + (int)log2((hi - lo)/p); double mid; while(r--){ mid = (lo + hi)/2; f(mid) ? hi = mid : lo = mid; } return (lo + hi)/2; }
template<typename T, typename U>
T bsh(T lo, T hi, U f){ lo--; T mid; while(lo < hi){ mid = (lo + hi + 1)/2; f(mid) ? lo = mid : hi = mid-1; } return lo; }
template<typename U>
double bshd(double lo, double hi, U f, double p = 1e-9){ int r = 3+(int)log2((hi - lo)/p); double mid; while(r--){ mid = (lo + hi)/2; f(mid) ? lo = mid : hi = mid; } return (lo + hi)/2; }
// some more utility functions
template<typename T>
pair<T, int> get_min(vector<T> &v){ typename vector<T> :: iterator it = min_element(v.begin(), v.end()); return mp(*it, it - v.begin());}
template<typename T>
pair<T, int> get_max(vector<T> &v){ typename vector<T> :: iterator it = max_element(v.begin(), v.end()); return mp(*it, it - v.begin());}
template<typename T> bool ckmin(T& a, const T& b){return b < a ? a = b , true : false;}
template<typename T> bool ckmax(T& a, const T& b){return b > a ? a = b, true : false;}
int main(){
ios_base::sync_with_stdio(false);
cin.tie(NULL); cout.tie(NULL);
int n, m;
cin >> n >> m;
vector<array<int, 2>> a(n);
int dest = -1;
int source = -1;
int mxp = 30005;
vector<vi> pos(mxp);
REP(i, m){
cin >> a[i][0] >> a[i][1];
if(i == 0) source = a[i][0];
if(i == 1) dest = a[i][0];
pos[a[i][1]].pb(a[i][0]);
}
vector<vector<array<int, 2>>> g(n);
vector<bool> is(n, false);
REP(j, mxp){
sort(all(pos[j]));
pos[j].erase(unique(all(pos[j])), pos[j].end());
REP(i, pos[j].size()) is[pos[j][i]] = true;
REP(i, pos[j].size()){
int x = pos[j][i];
int nm = 0;
FORD(k, x - j, 0, j){
nm++;
g[x].pb({k, nm});
if(is[k]) break;
}
nm = 0;
FOR(k, x + j, n, j){
nm++;
g[x].pb({k, nm});
if(is[k]) break;
}
}
REP(i, pos[j].size()) is[pos[j][i]] = false;
}
vi dist(n, -1);
priority_queue<array<int, 2>, vector<array<int, 2>>, greater<array<int, 2>>> pq;
pq.push({0, source});
while(!pq.empty()){
while(!pq.empty() && dist[pq.top()[1]] != -1)
pq.pop();
if(pq.empty()) break;
int v = pq.top()[1];
dist[v] = pq.top()[0];
pq.pop();
for(auto x : g[v]){
if(dist[x[0]] == -1){
pq.push({dist[v] + x[1], x[0]});
}
}
}
cout << dist[dest] << "\n";
return 0;
}
Compilation message
skyscraper.cpp: In function 'int main()':
skyscraper.cpp:26:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
26 | #define FOR(i,j,k,in) for(int i=(j); i < (k);i+=in)
| ^
skyscraper.cpp:28:18: note: in expansion of macro 'FOR'
28 | #define REP(i,b) FOR(i,0,b,1)
| ^~~
skyscraper.cpp:106:9: note: in expansion of macro 'REP'
106 | REP(i, pos[j].size()) is[pos[j][i]] = true;
| ^~~
skyscraper.cpp:26:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
26 | #define FOR(i,j,k,in) for(int i=(j); i < (k);i+=in)
| ^
skyscraper.cpp:28:18: note: in expansion of macro 'FOR'
28 | #define REP(i,b) FOR(i,0,b,1)
| ^~~
skyscraper.cpp:107:9: note: in expansion of macro 'REP'
107 | REP(i, pos[j].size()){
| ^~~
skyscraper.cpp:26:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
26 | #define FOR(i,j,k,in) for(int i=(j); i < (k);i+=in)
| ^
skyscraper.cpp:28:18: note: in expansion of macro 'FOR'
28 | #define REP(i,b) FOR(i,0,b,1)
| ^~~
skyscraper.cpp:122:9: note: in expansion of macro 'REP'
122 | REP(i, pos[j].size()) is[pos[j][i]] = false;
| ^~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 2 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 3 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 4 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 5 |
Correct |
1 ms |
1024 KB |
Output is correct |
| 6 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 7 |
Correct |
1 ms |
1024 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 2 |
Correct |
1 ms |
1016 KB |
Output is correct |
| 3 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 4 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 5 |
Correct |
2 ms |
1004 KB |
Output is correct |
| 6 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 7 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 8 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 9 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 10 |
Runtime error |
2 ms |
1900 KB |
Execution killed with signal 6 |
| 11 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 2 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 3 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 4 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 5 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 6 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 7 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 8 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 9 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 10 |
Runtime error |
2 ms |
1900 KB |
Execution killed with signal 6 |
| 11 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
1024 KB |
Output is correct |
| 2 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 3 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 4 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 5 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 6 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 7 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 8 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 9 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 10 |
Runtime error |
2 ms |
1900 KB |
Execution killed with signal 6 |
| 11 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 2 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 3 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 4 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 5 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 6 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 7 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 8 |
Correct |
2 ms |
1004 KB |
Output is correct |
| 9 |
Correct |
1 ms |
1004 KB |
Output is correct |
| 10 |
Runtime error |
3 ms |
1900 KB |
Execution killed with signal 6 |
| 11 |
Halted |
0 ms |
0 KB |
- |
