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Cod sursa(job #755492)
#include <iostream>
#include <fstream>
using namespace std;
#define nmax 100005
ifstream f("aib.in");
ofstream g("aib.out");
int n, m, aib[nmax];
void udpate(int poz, int val){
int bit = 0;
for(; poz<=n; ){
while( (poz & (1<<bit))==0 ) ++bit;//caut primul bit de 1
aib[poz] += val;
poz += (1<<bit); //adaug cel mai nesemnificativ bit(mutandu-l cu o pozitie mai la stanga);
++bit;
}
}
void citeste(){
f >> n >> m;
for(int i=1; i<=n; i++){
int x;
f >> x;
udpate(i,x);
}
for(int i=1; i<=n; i++) cout << aib[i] << " " ;
}
int query(int poz){
int sum=0, bit=0;
for(; poz; ){
sum += aib[poz];
while( (poz & (1<<bit)) == 0) ++bit;//caut primul bit de 1
poz -= (1<<bit);//elimin cel mai nesemnificativ bit de 1
++bit;
}
return sum;
}
int cb(int val){
int st = 0;
int dr = n;
int sol = -1;
while(st <= dr){
int mij = (st + dr) / 2;
if (query(mij) >= val){
sol = mij;
dr = mij - 1;
}else st = mij + 1;
}
return sol;
}
void rezolva(){
for(int i=1; i<=m; i++){
int tip, x, y;
f >> tip;
if (tip == 0){
f >> x >> y;
udpate(x, y);
continue;
}
if (tip == 1){
f >> x >> y;
g << query(y) - query(x-1) << "\n";
continue;
}
if (tip == 2){
f >> x;
g << cb(x) << "\n";
}
}
}
int main(){
citeste();
rezolva();
f.close();
g.close();
return 0;
}