Submission #1084846

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Source Code Expand

#include <stdio.h>
#include <set>
#include <algorithm>

using namespace std;
typedef pair<int,int> pii;

typedef int _loop_int;
#define REP(i,n) for(_loop_int i=0;i<(_loop_int)(n);++i)
#define FOR(i,a,b) for(_loop_int i=(_loop_int)(a);i<(_loop_int)(b);++i)

int n,m;
pii ranges[353531];   // sort by first, [left, right]
pii ranges2[353531];  // sort by second, [right, id]

int ans[125252];

const int B = 400;
const int C = 300;

// pointer struct
struct data{
  // id, position, in-iterator, out-iterator
  int id,pos,in,out;
};
data pts[C];
int cnt[353531];

int main(){
  // input
  scanf("%d%d",&n,&m);
  REP(i,n){
    int l,r;
    scanf("%d%d",&l,&r);
    ranges[i] = pii(l,r);
  }
  
  // d small
  FOR(d,1,min(B,m+1)){
    int tmp = 0;
    REP(i,n){
      int x = (ranges[i].first+d-1)/d;
      if(x*d<=ranges[i].second)tmp++;
    }
    ans[d]=tmp;
  }

  // d large
  // sort
  sort(ranges,ranges+n);
  REP(i,n)ranges2[i]=pii(ranges[i].second, i);
  sort(ranges2,ranges2+n);

  // pointer init
  data yo;
  yo.id=0; yo.pos=0; yo.in=0; yo.out=0;
  set<int> S;
  int tmp = 0;
  FOR(i,1,m+1){
    yo.pos++;
    while(yo.in<n && ranges[yo.in].first==yo.pos){
      S.insert(yo.in);
      yo.in++;
    }
    while(yo.out<n && ranges2[yo.out].first<yo.pos){
      S.erase(S.find(ranges2[yo.out].second));
      yo.out++;
    }
    if(i%B==0){
      // pts
      pts[yo.id] = yo;
      yo.id++;
      for(int x : S){
        if(cnt[x]==0)tmp++;
        cnt[x]++;
      }
    }
  }

  int pts_len = yo.id;
  FOR(d,min(B,m+1),m+1){
    ans[d] = tmp;
    if(d==m)break;
    REP(i,pts_len){
      if(pts[i].pos > m)break;
      // step pts[i]
      pts[i].pos += i+1;
      while(pts[i].in<n && ranges[pts[i].in].first<=pts[i].pos){
        if(cnt[pts[i].in]==0)tmp++;
        cnt[pts[i].in]++;
        pts[i].in++;
      }
      while(pts[i].out<n && ranges2[pts[i].out].first<pts[i].pos){
        int id = ranges2[pts[i].out].second;
        cnt[id]--;
        if(cnt[id]==0)tmp--;
        pts[i].out++;
      }
    }
  }
  FOR(d,1,m+1)printf("%d\n",ans[d]);
  return 0;
}

Submission Info

Compile Error

./Main.cpp: In function ‘int main()’:
./Main.cpp:31:22: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d",&n,&m);
                      ^
./Main.cpp:34:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d",&l,&r);
                        ^

Judge Result