Submission #154444

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
154444	2019-09-21 21:32:15	Dormi	Rectangles (IOI19_rect)	C++14	100 / 100	4539 ms	736340 KiB

rect

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#include <bits/stdc++.h>
using namespace std;
typedef pair<int,int> pii;
const int MAXN=2500;
int bit[MAXN+1];
int n,m;
vector<pii> rowranges[MAXN][MAXN];
vector<pii> colranges[MAXN][MAXN];
int preloc[MAXN];
int sufloc[MAXN];
pii deq[MAXN];
inline void update(int loc, int val){
  for(;loc<=n;loc+=loc&-loc)bit[loc]+=val;
}
inline int sum(int loc){
  int ans=0;
  for(;loc>0;loc-=loc&-loc)ans+=bit[loc];
  return ans;
}
long long count_rectangles(std::vector<std::vector<int>> a){
  n=a.size();
  m=a[0].size();
  for(int i=0;i<n;i++){
    int l=0,r=-1;
    for(int j=m-1;j>=0;j--){
      while(r>=l&&deq[r].second<=a[i][j])r--;
      if(r>=l)sufloc[j]=deq[r].first;
      else sufloc[j]=-1;
      deq[++r]={j,a[i][j]};
    }
 
 
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Compilation message (stderr)

rect.cpp: In function 'long long int count_rectangles(std::vector<std::vector<int> >)':
rect.cpp:66:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    while(l<rowranges[j][i].size()&&r<rowranges[j+1][i].size()){
          ~^~~~~~~~~~~~~~~~~~~~~~~
rect.cpp:66:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    while(l<rowranges[j][i].size()&&r<rowranges[j+1][i].size()){
                                    ~^~~~~~~~~~~~~~~~~~~~~~~~~
rect.cpp:81:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    while(l<colranges[i][j].size()&&r<colranges[i][j+1].size()){
          ~^~~~~~~~~~~~~~~~~~~~~~~
rect.cpp:81:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    while(l<colranges[i][j].size()&&r<colranges[i][j+1].size()){
                                    ~^~~~~~~~~~~~~~~~~~~~~~~~~
rect.cpp:107:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int k=r;k<colranges[i][j].size();k++)update(colranges[i][j][k].first+1,-1);
                ~^~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 7 / 7
• Subtask 3: 12 / 12
• Subtask 4: 22 / 22
• Subtask 5: 10 / 10
• Subtask 6: 13 / 13
• Subtask 7: 28 / 28