제출 #889035

#제출 시각아이디문제언어결과실행 시간메모리
889035dwuy지구 온난화 (NOI13_gw)C++14
컴파일 에러
0 ms0 KiB
/// dwuy: _,\,,,_\,__,\,,_ #include <bits/stdc++.h> #define fastIO ios_base::sync_with_stdio(false); cin.tie(NULL) #define file(a) freopen(a".inp","r",stdin); freopen(a".out", "w",stdout) #define fi first #define se second #define endl "\n" #define len(s) int32_t(s.length()) #define MASK(k)(1LL<<(k)) #define TASK "" using namespace std; typedef tuple<int, int, int> tpiii; typedef pair<double, double> pdd; typedef pair<int, int> pii; typedef long long ll; const long long OO = 1e18; const int MOD = 1e9 + 7; const int INF = 1e9; struct DSU{ int n; vector<int> e; vector<bool> active; DSU(int n=0){ this->n = n; this->e.assign(n+5, -1); this->active.assign(n+5, 0); } int fp(int u){ return e[u] < 0? u : e[u] = fp(e[u]); } bool unon(int u, int v){ if(!active[u] || !active[v]) return 0; u = fp(u); v = fp(v); if(u == v) return 0; if(e[u] > e[v]) swap(u, v); e[u] += e[v]; e[v] = u; return 1; } }; const int MX = 1000005; int n; pii a[MX]; int gw(int N, int H[]){ n = N; for(int i=1; i<=n; i++) a[i] = {H[i-1], i}; sort(a+1, a+1+n, greater<pii>()); DSU dsu(n); a[0].fi = -1; int ans = 0; int cur = 0; for(int i=1; i<=n; i++){ if(a[i].fi != a[i-1].fi) ans = max(ans, cur); cur++; dsu.active[a[i].se] = 1; cur -= dsu.unon(a[i].se, a[i].se-1); cur -= dsu.unon(a[i].se, a[i].se+1); } return ans; }

컴파일 시 표준 에러 (stderr) 메시지

/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/crt1.o: in function `_start':
(.text+0x24): undefined reference to `main'
collect2: error: ld returned 1 exit status