Submission #260032

#TimeUsernameProblemLanguageResultExecution timeMemory
260032pure_memJakarta Skyscrapers (APIO15_skyscraper)C++14
57 / 100
1100 ms39160 KiB
#include <bits/stdc++.h> #define X first #define Y second #define MP make_pair #define ll long long using namespace std; const int N = 3e4, inf = 1e9; const int bs = 300; int n, m, dst[300][N]; vector<int> dog[N]; int main () { ios::sync_with_stdio(0); cin.tie(0); cout.tie(0); cin >> n >> m; int start = 0, finish = 0; for(int i = 0;i < m;i++){ int x, y; cin >> x >> y; if(i == 0) start = x; else if(i == 1) finish = x; dog[x].push_back(y); } memset(dst, 0x3f, sizeof(dst)); set< pair< int, pair<int, int> > > st; dst[0][start] = 0; st.insert(MP(0, MP(start, 0))); while(!st.empty()){ pair< int, pair<int, int> > temp = *st.begin(); st.erase(st.begin()); int dst_pos = temp.X, pos = temp.Y.X, power = temp.Y.Y; // cerr << dst_pos << " " << pos << "\n"; if(power == 0){ for(int it = 0;it < (int)dog[pos].size();it++){ power = dog[pos][it]; if(power < bs){ if(dst[power][pos] > dst_pos){ st.erase(MP(dst[power][pos], MP(pos, power))); dst[power][pos] = dst_pos; st.insert(MP(dst_pos, MP(pos, power))); } } else{ for(int j = 1;pos - j * power >= 0;j++){ int next = pos - j * power; if(dst[0][next] > dst_pos + j){ st.erase(MP(dst[0][next], MP(next, 0))); dst[0][next] = dst_pos + j; st.insert(MP(dst[0][next], MP(next, 0))); } } for(int j = 1;pos + j * power < n;j++){ int next = pos + j * power; if(dst[0][next] > dst_pos + j){ st.erase(MP(dst[0][next], MP(next, 0))); dst[0][next] = dst_pos + j; st.insert(MP(dst[0][next], MP(next, 0))); } } } } } else{ if(dst[0][pos] > dst_pos){ st.erase(MP(dst[0][pos], MP(pos, 0))); dst[0][pos] = dst_pos; st.insert(MP(dst_pos, MP(pos, 0))); } if(pos - power >= 0 && dst[power][pos - power] > dst_pos + 1){ st.erase(MP(dst[power][pos - power], MP(pos - power, power))); dst[power][pos - power] = dst_pos + 1; st.insert(MP(dst_pos + 1, MP(pos - power, power))); } if(pos + power < n && dst[power][pos + power] > dst_pos + 1){ st.erase(MP(dst[power][pos + power], MP(pos + power, power))); dst[power][pos + power] = dst_pos + 1; st.insert(MP(dst_pos + 1, MP(pos + power, power))); } } } cout << (dst[0][finish] >= inf ? -1: dst[0][finish]); }
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