Submission #294966

#TimeUsernameProblemLanguageResultExecution timeMemory
294966PajarajaRectangles (IOI19_rect)C++17
100 / 100
3060 ms272296 KiB
#include "rect.h" #include <bits/stdc++.h> #pragma GCC optimize("O3") #define MAXN 2507 using namespace std; vector<int> ind[MAXN]; short qx[2*MAXN*MAXN],qy[2*MAXN*MAXN],ql[2*MAXN*MAXN],qt[2*MAXN*MAXN],lge[2][MAXN],rge[2][MAXN],dp[2][MAXN][MAXN]; stack<int> st; int bit[MAXN][MAXN],cnt; inline void upd(int k,int u,int v) { while(u<MAXN) { bit[k][u]+=v; u+=u&(-u); } } inline int fnd(int k,int u) { int sol=0; while(u>=k) { sol+=bit[k][u]; u-=u&(-u); } return sol; } bool cmp(int a,int b) {return ql[a]<ql[b];} long long count_rectangles(std::vector<std::vector<int> > a) { int n=a.size(),m=a[0].size(),l=0; long long sol=0; for(int i=0;i<2;i++) for(int j=0;j<MAXN;j++) for(int k=0;k<MAXN;k++) dp[i][j][k]=0; for(int i=1;i<n-1;i++) { for(int j=0;j<m;j++) { while(!st.empty() && a[i][st.top()]<a[i][j]) st.pop(); if(!st.empty() && st.top()+1!=j) { if(dp[l^1][st.top()+1][j-1]) dp[l][st.top()+1][j-1]=dp[l^1][st.top()+1][j-1]; else dp[l][st.top()+1][j-1]=i; qx[cnt]=st.top()+1; qy[cnt]=j-1; ql[cnt]=2*dp[l][st.top()+1][j-1]+1; ind[i].push_back(cnt++); } if(!st.empty()) lge[l][j]=st.top(); else lge[l][j]=-1; st.push(j); } while(!st.empty()) st.pop(); for(int j=m-1;j>=0;j--) { while(!st.empty() && a[i][st.top()]<a[i][j]) st.pop(); if(!st.empty() && st.top()-1!=j && lge[l][st.top()]!=j) { if(dp[l^1][j+1][st.top()-1]) dp[l][j+1][st.top()-1]=dp[l^1][j+1][st.top()-1]; else dp[l][j+1][st.top()-1]=i; qx[cnt]=j+1; qy[cnt]=st.top()-1; ql[cnt]=2*dp[l][j+1][st.top()-1]+1; ind[i].push_back(cnt++); } if(!st.empty()) rge[l][j]=st.top(); else rge[l][j]=-1; st.push(j); } while(!st.empty()) st.pop(); if(i!=1) { for(int j=0;j<m;j++) if(lge[l^1][j]!=-1) dp[l^1][lge[l^1][j]+1][j-1]=0; for(int j=0;j<m;j++) if(rge[l^1][j]!=-1) dp[l^1][j+1][rge[l^1][j]-1]=0; } l^=1; } for(int i=0;i<2;i++) for(int j=0;j<MAXN;j++) for(int k=0;k<MAXN;k++) dp[i][j][k]=0; for(int i=1;i<m;i++) { if(i!=m-1) for(int j=0;j<n;j++) { while(!st.empty() && a[st.top()][i]<a[j][i]) st.pop(); if(!st.empty() && st.top()+1!=j) { if(dp[l^1][st.top()+1][j-1]) dp[l][st.top()+1][j-1]=dp[l^1][st.top()+1][j-1]; else dp[l][st.top()+1][j-1]=i; lge[l][j]=st.top(); } else lge[l][j]=-1; st.push(j); } while(!st.empty()) st.pop(); if(i!=m-1) for(int j=n-1;j>=0;j--) { while(!st.empty() && a[st.top()][i]<a[j][i]) st.pop(); if(!st.empty() && st.top()-1!=j && lge[l][st.top()]!=j) { if(dp[l^1][j+1][st.top()-1]) dp[l][j+1][st.top()-1]=dp[l^1][j+1][st.top()-1]; else dp[l][j+1][st.top()-1]=i; rge[l][j]=st.top(); } else rge[l][j]=-1; st.push(j); } while(!st.empty()) st.pop(); if(i!=1) { for(int j=0;j<n;j++) if(lge[l^1][j]!=-1 && !dp[l][lge[l^1][j]+1][j-1]) {qx[cnt]=dp[l^1][lge[l^1][j]+1][j-1]; qy[cnt]=i-1; ql[cnt]=2*lge[l^1][j]+4; ind[j-1].push_back(cnt++);} for(int j=0;j<n;j++) if(rge[l^1][j]!=-1 && !dp[l][j+1][rge[l^1][j]-1] && lge[l^1][rge[l^1][j]]!=j) {qx[cnt]=dp[l^1][j+1][rge[l^1][j]-1]; qy[cnt]=i-1; ql[cnt]=2*j+4; ind[rge[l^1][j]-1].push_back(cnt++);} for(int j=0;j<n;j++) if(lge[l^1][j]!=-1) dp[l^1][lge[l^1][j]+1][j-1]=0; for(int j=0;j<n;j++) if(rge[l^1][j]!=-1) dp[l^1][j+1][rge[l^1][j]-1]=0; } l^=1; } for(int i=1;i<n-1;i++) { sort(ind[i].begin(),ind[i].end(),cmp); for(int j=0;j<ind[i].size();j++) { if(ql[ind[i][j]]&1) upd(qx[ind[i][j]],qy[ind[i][j]],1); else for(int k=qx[ind[i][j]];k<=qy[ind[i][j]];k++) sol+=fnd(k,qy[ind[i][j]]); } for(int j=0;j<ind[i].size();j++) if(ql[ind[i][j]]&1) upd(qx[ind[i][j]],qy[ind[i][j]],-1); ind[i].clear(); } return sol; }

Compilation message (stderr)

rect.cpp: In function 'long long int count_rectangles(std::vector<std::vector<int> >)':
rect.cpp:112:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  112 |         for(int j=0;j<ind[i].size();j++)
      |                     ~^~~~~~~~~~~~~~
rect.cpp:117:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  117 |         for(int j=0;j<ind[i].size();j++) if(ql[ind[i][j]]&1) upd(qx[ind[i][j]],qy[ind[i][j]],-1);
      |                     ~^~~~~~~~~~~~~~
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...