제출 #696390

#제출 시각아이디문제언어결과실행 시간메모리
696390youngyojunBread First Search (CCO21_day2problem2)C++17
11 / 25
28 ms716 KiB
#include <bits/stdc++.h> #define upmin(a,b) (a)=(min((a),(b))) #define INF (0x3f3f3f3f) using namespace std; const int MAXN = 5'005; int D[MAXN], L[MAXN], B[MAXN]; int A[MAXN]; int N; int main() { ios_base::sync_with_stdio(0); cin.tie(0); { int M; cin >> N >> M; fill_n(A, N+2, INF); while(M--) { int a, b; cin >> a >> b; if(a > b) swap(a, b); upmin(A[b], a); } } L[N+1] = N; for(int i = N; i; i--) L[i] = min({L[i+1], A[i], i-1}); for(int i = N; i; i--) if(A[i] < i) { B[A[i]+1]++; B[i+1]--; } for(int i = 1; i <= N; i++) B[i+1] += B[i]; for(int i = N; i; i--) { int r = 0; for(int j = N+1; i < j; j--) if(i <= L[j]) { if(1 == i && 2 != j) continue; int t = D[j] + B[j]; if(r < t) r = t; } D[i] = r; } cout << N-1 - D[1] << '\n'; return 0; }
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