Submission #294359

#TimeUsernameProblemLanguageResultExecution timeMemory
294359PajarajaRectangles (IOI19_rect)C++17
72 / 100
5098 ms721432 KiB
#include "rect.h" #include <bits/stdc++.h> #define MAXN 2507 using namespace std; set<int> s[MAXN][MAXN]; vector<int> ind[MAXN]; int qx[MAXN*MAXN],qy[MAXN*MAXN],ql[MAXN*MAXN],qt[MAXN*MAXN],cnt; stack<int> st; int bit[MAXN][MAXN]; 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) { sol+=bit[k][u]; u-=u&(-u); } return sol; } bool cmp(int a,int b) {return 2*ql[a]+qt[a]<2*ql[b]+qt[b];} long long count_rectangles(std::vector<std::vector<int> > a) { int n=a.size(),m=a[0].size(); long long sol=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) s[i][j-1].insert(st.top()+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) s[i][st.top()-1].insert(j+1); st.push(j); } while(!st.empty()) st.pop(); } for(int j=1;j<m-1;j++) { for(int i=1;i<n;i++) { for(set<int>::iterator it=s[i][j].begin();it!=s[i][j].end();it++) { for(int k=i;k<n-1;k++) { if(s[k][j].find(*it)==s[k][j].end()) break; else {if(k!=i) s[k][j].erase(*it); qx[cnt]=*it; qy[cnt]=j; qt[cnt]=1; ql[cnt]=i; ind[k].push_back(cnt++);} } } s[i][j].clear(); } } for(int i=1;i<m-1;i++) { 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) s[j-1][i].insert(st.top()+1); st.push(j); } while(!st.empty()) st.pop(); 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) s[st.top()-1][i].insert(j+1); st.push(j); } while(!st.empty()) st.pop(); } for(int i=1;i<n-1;i++) { for(int j=1;j<m;j++) { for(set<int>::iterator it=s[i][j].begin();it!=s[i][j].end();it++) { for(int k=j+1;k<m;k++) { if(s[i][k].find(*it)==s[i][k].end()) {qx[cnt]=j; qy[cnt]=k-1; qt[cnt]=2; ql[cnt]=*it; ind[i].push_back(cnt++); break;} else s[i][k].erase(*it); } } } } 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(qt[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(qt[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:99:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   99 |         for(int j=0;j<ind[i].size();j++)
      |                     ~^~~~~~~~~~~~~~
rect.cpp:104:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  104 |         for(int j=0;j<ind[i].size();j++) if(qt[ind[i][j]]==1) upd(qx[ind[i][j]],qy[ind[i][j]],-1);
      |                     ~^~~~~~~~~~~~~~
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