#include <cstdio>
#include <cstring>
#include <algorithm>
#include <vector>
using namespace std;
const int U = 1; // 400 ~ 1500
const int B = 1500; // 400 ~ 1500
struct elem{
int val;
int next;
int cnt;
};
bool operator<(elem a, elem b){ return a.val < b.val; }
vector<elem> bucket[105];
int sentinel;
int b[150005];
int a[150005], n, l;
int q_cnt;
void make_arr(){
int piv = 0;
for (int i=0; i<sentinel; i++) {
for (int j=0; j<bucket[i].size(); j++) {
a[piv++] = bucket[i][j].val;
}
}
}
void bucket_clear(){
for (int i=0; i<sentinel; i++) {
bucket[i].clear();
int piv = min(n-i*B,B);
int pt = piv;
bucket[i].resize(piv);
for (int j=i*B+piv-1; j>=i*B; j--) {
while (pt && b[i*B+pt-1] > b[j] + l) pt--;
if(pt == piv){
bucket[i][j-i*B].val = b[j];
bucket[i][j-i*B].next = -1;
bucket[i][j-i*B].cnt = 0;
}
else{
bucket[i][j-i*B].val = b[j];
if(bucket[i][pt].next == -1){
bucket[i][j-i*B].next = pt;
}
else{
bucket[i][j-i*B].next = bucket[i][pt].next;
}
bucket[i][j-i*B].cnt = bucket[i][pt].cnt + 1;
}
}
}
}
void single_bucket_update(int buck_num, int pos, int val){
}
int query(){
int pos = 0, ret = 0;
for (int i=0; i<sentinel; ) {
if(bucket[i].empty()){
i++;
continue;
}
ret += bucket[i][pos].cnt + 1;
if(bucket[i][pos].next != -1) pos = bucket[i][pos].next;
int new_buck = i+1;
int new_pos = bucket[i][pos].val + l;
while (1){
if(new_buck == sentinel) break;
if(lower_bound(bucket[new_buck].begin(),bucket[new_buck].end(),(elem){new_pos+1,0,0})
!= bucket[new_buck].end()) break;
new_buck++;
}
if(new_buck == sentinel) break;
i = new_buck;
pos = (int)(lower_bound(bucket[new_buck].begin(),bucket[new_buck].end(),(elem){new_pos+1,0,0}) - bucket[new_buck].begin());
}
return ret;
}
void init(int N, int L, int* X){
memcpy(a,X,sizeof(int) * N);
n = N;
l = L;
while (sentinel * B < n) sentinel++;
bucket_clear();
}
int update(int i, int y){
q_cnt = (q_cnt + 1) % U;
int o = a[i];
a[i] = y;
// erase and delete in ordered set
if(q_cnt == 0){
// make_arr();
for (int i=0; i<n; i++) {
b[i] = a[i];
}
sort(b,b+n);
bucket_clear();
}
return query();
}
int main(){
int n,l,m,p[150005];
scanf("%d %d %d",&n,&l,&m);
for (int i=0; i<n; i++) {
scanf("%d",&p[i]);
}
init(n,l,p);
for (int i=0; i<m; i++) {
int a,b;
scanf("%d %d",&a,&b);
printf("%d\n",update(a,b));
}
}
Compilation message
elephants.cpp: In function ‘void make_arr()’:
elephants.cpp:28:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for (int j=0; j<bucket[i].size(); j++) {
^
elephants.cpp: In function ‘int update(int, int)’:
elephants.cpp:103:9: warning: unused variable ‘o’ [-Wunused-variable]
int o = a[i];
^
elephants.cpp: In function ‘int main()’:
elephants.cpp:119:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
scanf("%d %d %d",&n,&l,&m);
^
elephants.cpp:121:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
scanf("%d",&p[i]);
^
elephants.cpp:126:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
scanf("%d %d",&a,&b);
^
/tmp/ccGxDKAA.o: In function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'
/tmp/cc8McElh.o:elephants.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status
