제출 #762463

#제출 시각아이디문제언어결과실행 시간메모리
762463stefanneagu지구 온난화 (NOI13_gw)C++17
23 / 40
435 ms26204 KiB
#include <iostream> #include <vector> #include <set> #include <algorithm> using namespace std; const int nmax = 1e6 + 7; struct insula { int val, ind; } v[nmax]; int root[nmax], sum[nmax]; bool f[nmax]; bool cmp(insula a, insula b) { return a.val > b.val; } int find(int x) { if(root[x] == x) { return x; } root[x] = find(root[x]); return root[x]; } void unite(int a, int b) { if(sum[a] < sum[b]) { swap(a, b); } sum[a] += sum[b]; root[b] = a; } int32_t main() { int n, maxx = 0, cnt = 0; cin >> n; for(int i = 1; i <= n; i ++) { cin >> v[i].val; v[i].ind = i; } sort(v + 1, v + n + 1, cmp); for(int i = 1; i <= n; i ++) { f[v[i].ind] = 1; if(f[v[i].ind - 1] == 0 && f[v[i].ind + 1] == 0) { cnt ++; root[v[i].ind] = v[i].ind; sum[v[i].ind] = 1; } else if(f[v[i].ind - 1] == 1 && f[v[i].ind + 1] == 0) { root[v[i].ind] = v[i].ind; sum[v[i].ind] = 1; unite(v[i].ind, find(v[i].ind - 1)); } else if(f[v[i].ind + 1] == 1 && f[v[i].ind - 1] == 0) { root[v[i].ind] = v[i].ind; sum[v[i].ind] = 1; unite(v[i].ind, find(v[i].ind + 1)); } else { cnt --; root[v[i].ind] = v[i].ind; sum[v[i].ind] = 1; unite(v[i].ind, find(v[i].ind + 1)); unite(find(v[i].ind), find(v[i].ind - 1)); } maxx = max(maxx, cnt); } cout << maxx; return 0; }
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