#include<bits/stdc++.h>
using namespace std;
int a[1000000],n,b[1000000];
int main(){
    cin >>n;
    for (int i=1;i<=n;i++) {cin >> a[i];
    if (a[i]%2==1) b[a[i]]=i;
    }    
    for (int i=1;i<=n;i++){
        if (b[a[i]]!=0) {cout << b[a[i]] << " "<<a[i]<<'\n';b[a[i]]=0;}
    }
    
}

Nhập trực tiếp , in dạng :
Chỉ số _ số 

......

Mình đang học pascal ạ

uses crt;

const fi='bai1.inp';

var f1:text;

a,b,c,cv,dt,p:real;

begin

clrscr;

assign(f1,fi); rewrite(f1);

write('Nhap a='); readln(a);

write('Nhap b='); readln(b);

write('Nhap c='); readln(c);

if (a>0) and (b>0) and (c>0) and (a+b>c) and (a+c>b) and (b+c>a) then 

begin

cv:=a+b+c;

p:=cv/2;

dt:=sqrt(p*(p-a)*(p-b)*(p-c));

writeln(f1,'Chu vi la: ',cv:4:2);

writeln(f1,'Dien tich la: ',dt:4:2);

end

else writeln(f1,'Day khong la ba canh trong mot tam giac');

close(f1);

readln;

end.

cho em hỏi cái này viết ra thuật toán thì viết kiểu sao ạ

Program HOC24;

var S: string;

d,i: byte;

begin

write('S= '); readln(s);

For i:= length(s) downto 1 do write(s[i]);

writeln;

while s[length(s)]=#32 do delete(s,length(s),1);

while pos(#32#32,s)<>0 do delete(s,pos(#32#32,s),1);

while s[1]=#32 do delete(s,1,1);

d:=0;

for i:=1 to length(s) do d:=d+1;

write('So tu :',d);

readln

end.

uses crt;

var s:string[200];

i,d,dem:integer;

begin

clrscr;

write('Nhap xau:'); readln(s);

d:=length(s);

write('Xau viet theo chieu nguoc la: ');

for i:=d downto 1 do 

  write(st[i]);

writeln;

dem:=0;

for i:=1 to d do 

  if st[i]=#32 then inc(dem);

writeln('So tu la: ',dem);

readln;

end.

uses crt;

var s:string;

i,d:integer;

begin

clrscr;

write('Nhap xau S:'); readln(s);

d:=length(s);

for i:=1 to d do 

  s[i]:=upcase(s[i]);

writeln(s);

readln;

end.

uses crt;

var s:string;

i,d,dem1,dem2,dem3,dem4:integer;

begin

clrscr;

write('Nhap xau s:'); readln(s);

d:=length(s);

dem1:=0;

dem2:=0;

dem3:=0;

dem4:=0;

for i:=1 to d do 

  begin

if st[i] in ['0'..'9'] then inc(dem1)

else if st[i] in ['a'..'z'] then inc(dem2)

else if st[i] in ['A'..'Z'] then inc(dem3)

else inc(dem4);

end;

writeln('So luong ky tu so la: ',dem1);

writeln('So luong ky tu thuong la: ',dem2);

writeln('So luong ky tu hoa la: ',dem3);

writeln('So luong ky tu dac biet la: ',dem4);

readln;

end.

chữ đẹp quá :))

Chữ thầy e á a😥😥

program HOC24;

var s:tring;

i: byte;

begin

write('Nhap xau S: '); readln(s);

for i:=1 to length(s) do if s[i] in ['a'..'z'] then write(s[i]);

readln

end.