제출 #30091

#제출 시각아이디문제언어결과실행 시간메모리
30091khsoo01무제 (POI11_tem)C++11
100 / 100
666 ms25456 KiB
#include<bits/stdc++.h> using namespace std; typedef pair<int,int> pii; const int N = 1000005; int n, s[N], e[N], l[N], ans; vector<pii> st; struct segtree { int v[3*N], lim; void init (int T[]) { for(lim=1;lim<=n+1;lim<<=1); for(int i=1;i<=n;i++) v[i+lim] = T[i]; for(int i=lim;--i;) v[i] = max(v[2*i], v[2*i+1]); } int lb (int P, int V) { P += lim; while(P&(P+1)) { if(v[P] > V) break; P = (P-1)/2; } if(!(P&(P+1))) return 0; while(P < lim) { P = 2*P + (v[2*P+1] > V); } return P - lim; } int rb (int P, int V) { P += lim; while(P&(P-1)) { if(v[P] > V) break; P = (P+1)/2; } if(!(P&(P-1))) return n+1; while(P < lim) { P = 2*P + !(v[2*P] > V); } return P - lim; } } seg; int main() { scanf("%d",&n); for(int i=1;i<=n;i++) { scanf("%d%d",&s[i],&e[i]); } seg.init(s); for(int i=1;i<=n;i++) { l[i] = seg.lb(i, e[i]) + 1; } seg.init(l); for(int i=1;i<=n;i++) { ans = max(ans, seg.rb(i, i) - i); } printf("%d\n",ans); }

컴파일 시 표준 에러 (stderr) 메시지

tem.cpp: In function 'int main()':
tem.cpp:45:16: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
                ^
tem.cpp:47:28: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&s[i],&e[i]);
                            ^
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