제출 #1059840

#제출 시각아이디문제언어결과실행 시간메모리
1059840alexdd서열 (APIO23_sequence)C++17
13 / 100
2079 ms68692 KiB
#include "sequence.h" #include <bits/stdc++.h> using namespace std; const int INF = 1e9; struct SegTreeLazy_min { int aint[1100000],lazy[1100000]; void build(int nod, int st, int dr, int paritate) { lazy[nod]=0; if(st==dr) { if(st%2==paritate) aint[nod]=0; else aint[nod]=INF; return; } aint[nod] = min(aint[nod*2], aint[nod*2+1]); } void propagate(int nod) { lazy[nod*2]+=lazy[nod]; lazy[nod*2+1]+=lazy[nod]; aint[nod*2]+=lazy[nod]; aint[nod*2+1]+=lazy[nod]; lazy[nod]=0; } void upd(int nod, int st, int dr, int le, int ri, int newv) { if(le>ri) return; if(le==st && dr==ri) { lazy[nod]+=newv; aint[nod]+=newv; return; } propagate(nod); int mij=(st+dr)/2; upd(nod*2,st,mij,le,min(mij,ri),newv); upd(nod*2+1,mij+1,dr,max(mij+1,le),ri,newv); aint[nod] = min(aint[nod*2], aint[nod*2+1]); } int qry(int nod, int st, int dr, int le, int ri) { if(le>ri) return INF; if(le==st && dr==ri) return aint[nod]; propagate(nod); int mij=(st+dr)/2; return min(qry(nod*2,st,mij,le,min(mij,ri)), qry(nod*2+1,mij+1,dr,max(mij+1,le),ri)); } }; struct SegTreeLazy_max { int aint[1100000],lazy[1100000]; void build(int nod, int st, int dr, int paritate) { lazy[nod]=0; if(st==dr) { if(st%2==paritate) aint[nod]=0; else aint[nod]=-INF; return; } aint[nod] = max(aint[nod*2], aint[nod*2+1]); } void propagate(int nod) { lazy[nod*2]+=lazy[nod]; lazy[nod*2+1]+=lazy[nod]; aint[nod*2]+=lazy[nod]; aint[nod*2+1]+=lazy[nod]; lazy[nod]=0; } void upd(int nod, int st, int dr, int le, int ri, int newv) { if(le>ri) return; if(le==st && dr==ri) { lazy[nod]+=newv; aint[nod]+=newv; return; } propagate(nod); int mij=(st+dr)/2; upd(nod*2,st,mij,le,min(mij,ri),newv); upd(nod*2+1,mij+1,dr,max(mij+1,le),ri,newv); aint[nod] = max(aint[nod*2], aint[nod*2+1]); } int qry(int nod, int st, int dr, int le, int ri) { if(le>ri) return -INF; if(le==st && dr==ri) return aint[nod]; propagate(nod); int mij=(st+dr)/2; return max(qry(nod*2,st,mij,le,min(mij,ri)), qry(nod*2+1,mij+1,dr,max(mij+1,le),ri)); } }; SegTreeLazy_min aint_min[2]; SegTreeLazy_max aint_max[2]; bool verif(int le1, int ri1, int le2, int ri2, int cnt0, int N) { pair<int,int> x[2],y[2]; for(int i=0;i<2;i++) { x[i] = {aint_min[i].qry(1,0,N,le1,ri1), aint_max[i].qry(1,0,N,le1,ri1)}; y[i] = {aint_min[i].qry(1,0,N,le2,ri2), aint_max[i].qry(1,0,N,le2,ri2)}; } for(int p=0;p<2;p++) { for(int q=0;q<2;q++) { pair<int,int> a = x[p], b = y[q]; if(a.first > b.first) swap(a,b); if(p==q) { if(a.second + cnt0 - 1 >= b.first) return 1; } else { if(a.second + cnt0 >= b.first) return 1; } } } return 0; } vector<int> pozs[500005]; int sequence(int N, std::vector<int> A) { aint_min[0].build(1,0,N,0); aint_min[1].build(1,0,N,1); aint_max[0].build(1,0,N,0); aint_max[1].build(1,0,N,1); for(int i=1;i<=N;i++) { aint_min[0].upd(1,0,N,i,N,+1); aint_min[1].upd(1,0,N,i,N,+1); aint_max[0].upd(1,0,N,i,N,+1); aint_max[1].upd(1,0,N,i,N,+1); pozs[A[i-1]].push_back(i); } int mxm=1; for(int val=1;val<=N;val++) { for(auto x:pozs[val]) { aint_min[0].upd(1,0,N,x,N,-1); aint_min[1].upd(1,0,N,x,N,-1); aint_max[0].upd(1,0,N,x,N,-1); aint_max[1].upd(1,0,N,x,N,-1); } for(int i=0;i<pozs[val].size();i++) { for(int j=i;j<pozs[val].size();j++) { for(int k=0;k<pozs[val].size();k++) { int x = pozs[val][k]; if(k<i) { aint_min[0].upd(1,0,N,x,pozs[val][i]-1,-1); aint_min[1].upd(1,0,N,x,pozs[val][i]-1,-1); aint_max[0].upd(1,0,N,x,pozs[val][i]-1,+1); aint_max[1].upd(1,0,N,x,pozs[val][i]-1,+1); } else if(k>j) { aint_min[0].upd(1,0,N,x,N,-1); aint_min[1].upd(1,0,N,x,N,-1); aint_max[0].upd(1,0,N,x,N,+1); aint_max[1].upd(1,0,N,x,N,+1); } } if(verif(0,pozs[val][i]-1,pozs[val][j],N,j-i+1,N)) { mxm = max(mxm, j-i+1); } for(int k=0;k<pozs[val].size();k++) { int x = pozs[val][k]; if(k<i) { aint_min[0].upd(1,0,N,x,pozs[val][i]-1,+1); aint_min[1].upd(1,0,N,x,pozs[val][i]-1,+1); aint_max[0].upd(1,0,N,x,pozs[val][i]-1,-1); aint_max[1].upd(1,0,N,x,pozs[val][i]-1,-1); } else if(k>j) { aint_min[0].upd(1,0,N,x,N,+1); aint_min[1].upd(1,0,N,x,N,+1); aint_max[0].upd(1,0,N,x,N,-1); aint_max[1].upd(1,0,N,x,N,-1); } } } } for(auto x:pozs[val]) { aint_min[0].upd(1,0,N,x,N,-1); aint_min[1].upd(1,0,N,x,N,-1); aint_max[0].upd(1,0,N,x,N,-1); aint_max[1].upd(1,0,N,x,N,-1); } } return mxm; }

컴파일 시 표준 에러 (stderr) 메시지

sequence.cpp: In function 'int sequence(int, std::vector<int>)':
sequence.cpp:163:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  163 |         for(int i=0;i<pozs[val].size();i++)
      |                     ~^~~~~~~~~~~~~~~~~
sequence.cpp:165:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  165 |             for(int j=i;j<pozs[val].size();j++)
      |                         ~^~~~~~~~~~~~~~~~~
sequence.cpp:167:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  167 |                 for(int k=0;k<pozs[val].size();k++)
      |                             ~^~~~~~~~~~~~~~~~~
sequence.cpp:191:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  191 |                 for(int k=0;k<pozs[val].size();k++)
      |                             ~^~~~~~~~~~~~~~~~~
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