ĐÁP ÁN VÒNG 2 CUỘC THI TIN HỌC:
* ĐỀ 1:
Câu 1:
CÂU 1:
const fi='uc.inp';
fo='uc.out';
var f: text;
a,b,c : integer;
function uc(x,y): integer;
var z: integer;
begin
while y<>0 do
begin
z:=x mod y;
x:=y;
y:=z;
end;
uc:=x;
end;
procedure ip;
begin
assign(f,fi);
reset(f);
read(f,a,b,c);
close(f);
end;
procedure out;
begin
assign(f,fo);
rewrite(f);
write(f,uc(uc(a,b),c);
close(f);
end;
begin
ip;
out;
end.
Câu 2:
const fi='SN.inp';
fo='SN.out';
var
f:text;
i,n:integer;
s:real;
procedure ip;
begin
assign(f,fi);
reset(f);
read(f,n);
close(f);
end;
procedure out;
begin
assign(f,fo);
rewrite(f);
s:=0;
for i:= 1 to n do
begin
if i mod 2 <> 0 then
s:=s+(i/(i+1));
if i mod 2 = 0 then
s:=s-(i/(i+1));
end;
write(f,s:0:2);
close(f);
end;
BEGIN
ip;
out;
END.
Câu 3:
const fi='SSNT.inp';
fo='SSNT.out';
var
f:text;
n,i,max,j:integer;
s:string;
a:array[1..32000] of integer;
function nt(x:integer):boolean;
var
i:integer;
begin
nt:=false;
if x < 2 then exit;
for i:= 2 to trunc(sqrt(x)) do
if x mod i = 0 then exit;
nt:=true;
end;
function snt(x:integer):boolean;
begin
snt:=false;
if x= 0 then exit;
while nt(x) = true do
x := x div 10;
if x = 0 then snt:=true;
end;
procedure ip;
begin
assign(f,fi);
reset(f);
max:=a[1];
readln(f,n);
for i:= 1 to n do
begin
read(f,a[i]);
if( a[i] < max ) and (nt(a[i]) = true) then
max:=a[i];
end;
close(f);
end;
procedure out;
begin
assign(f,fo);
rewrite(f);
writeln(f,max);
max:=0;
for i:= 1 to n do
begin
if snt(a[i]) = true then
begin
str(a[i],s);
if length(s) = 2 then
max:=max+a[i];
s:='';
end
else
a[i]:=-32000;
end;
writeln(f,max);
for i:= 1 to n-1 do
for j :=i+1 to n do
if a[i] > a[j] then
begin
max:=a[i];
a[i]:=a[j];
a[j]:=max;
end;
for i:= 1 to n do
if (a[i] > 0) and (a[i] <> a[i-1]) then write(f,a[i],' ');
close(f);
end;
BEGIN
ip;
out;
END.
CÂU 4:
const fi='TUOI.INP';
fo='TUOI.OUT';
var f: text;
a,b: byte;
procedure ip;
begin
assign(f,fi);
reset(f);
read(f,a,b);
close(f);
end;
procedure out;
begin
assign(f,fo);
rewrite(f);
if (x=y*2) and (x>18) and (x-y>=18) then write(f,'CO') else write(f,x-y*2);
close(f);
end;
begin
ip;
out;
end.
const fi='CM.INP';
fo='CM.OUT';
var f: text;
a,n,b,k: integer;
a1: array[1..32000] of integer;
function nt(x: integer): boolean;
var i: integer;
begin
nt:=false;
if x<2 then exit;
for i:=2 to trunc(sqrt(x)) do if x mod i=0 then exit;
nt:=true;
end;
procedure ip;
begin
assign(f,fi);
reset(f);
read(f,n);
close(f);
end;
procedure out;
begin
assign(f,fo);
rewrite(f);
d:=0;
for a:=1 to k do
if nt(a) then
begin
inc(d);
a1[d]:=a;
end;
for a:=1 to d do
for b:=x to d do
if a1[a]+a1[b]=k then writeln(f,a1[a],'+',a1[b]);
end;
close(f);
end;
begin
ip;
out;
end.
*ĐỀ 2 :
BÀI LÀM CỦA BẠN LÊ HOÀNG THẮNG:
//----------------------------CAU 1--------------------------------
var s,d,n,i,u:longint;
a:array[0..32001] of longint;
f:text;
function ucln(x,y:longint):longint;
begin
if y=0 then exit(x) else exit(ucln(y,x mod y));
end;
begin
assign(f,'ucln.inp');reset(f);
readln(f,n);
for i:=1 to n do read(f,a[i]); close(f);
u:=a[1];
for i:=2 to n do u:=ucln(u,a[i]);
assign(f,'ucln.out');rewrite(f);
write(f,'UCLN: ',u,'; UC: ');
for i:=1 to u do if u mod i=0 then
begin
if i<>u then write(f,i,',') else write(f,i);
if i<10 then inc(d) else inc(s,i);
end;
writeln(f);
writeln(f,d); write(f,s);
close(f);
end.
//----------------------------CAU 2--------------------------------
var n,i:longint;
s:real;
f:text;
begin
assign(f,'sn.inp');reset(f);
readln(f,n); close(f);
for i:=1 to n do if odd(i) then s:=s-i/(i+1) else s:=s+i/(i+1);
assign(f,'sn.out');rewrite(f);
write(f,s:0:2);
close(f);
end.
//----------------------------CAU 3--------------------------------
var a:array[0..1000000] of boolean;
b:array[0..1000000] of longint;
i,j,k,n,d:longint;
f:text;
procedure taosang(n:longint);
var i,j:longint;
begin
for i:=2 to trunc(sqrt(n)) do if not(a[i]) then
begin
j:=i*i;
while j<=n do begin a[j]:=true; inc(j,i); end;
end;
end;
begin
assign(f,'boso.inp');reset(f);
readln(f,n); taosang(n); close(f);
assign(f,'boso.out');rewrite(f);
for i:=2 to n do if not(a[i]) then
begin
inc(d);
b[d]:=i;
end;
for i:=1 to d do
for j:=i to d do
if (n-b[i]-b[j]>=b[j]) and not(a[n-b[i]-b[j]]) then
writeln(f,b[i],' ',b[j],' ',n-b[i]-b[j]);
close(f);
end.
//----------------------------CAU 4--------------------------------
THAM KHẢO ĐỀ 1.
//----------------------------CAU 5--------------------------------
var n,i,s,t:longint;
f:text;
begin
assign(f,'u.inp');reset(f);
readln(f,n); t:=n; close(f);
assign(f,'u.out');rewrite(f);
for i:=2 to trunc(sqrt(n)) do
begin
if n mod i=0 then
begin
write(f,i,' ');
repeat n:=n div i until n mod i>0;
end;
if t mod (i*i)=0 then inc(s,i*i);
end;
writeln(f);
write(f,s+1);
close(f);
end.
*ĐỀ CHUNG:
BÀI LÀM CỦA BẠN ĐÀO XUÂN SƠN :
Câu 1:
const fi='TCS.inp';
fo='TCS.out';
var
f:text;
x:char;
tg:byte;
s:integer;
CODE:integer;
procedure ip;
begin
assign(f,fi);
reset(f);
s:=0;
while not(eof(f)) do
begin
read(f,x);
if x in ['0'..'9'] then
begin
val(x,tg,CODE);
s:=s+tg;
end;
end;
close(f);
end;
procedure out;
begin
assign(f,fo);
rewrite(f);
write(f,s);
close(f);
end;
BEGIN
ip;
out;
END.
Câu 2:
const fi='t.inp';
fo='t.out';
var
f:text;
s:string;
i:byte;
procedure ip;
begin
assign(f,fi);
reset(f);
read(f,s);
close(f);
end;
procedure out;
begin
assign(f,fo);
rewrite(f);
s[1]:=upcase(s[1]);
for i:= 2 to length(s) do
if s[i-1] <> #32 then
s[i]:=lowercase(s[i]) else
s[i]:=upcase(s[i]);
write(f,s);
close(f);
end;
BEGIN
ip;
out;
END.
Lỗi chỗ giá trị n và điều kiện đầu vào:v
Sửa lại:
```cpp
#include <iostream>
using namespace std;
int main() {
int n;
cout << "Nhap vao so nguyen duong n: ";
cin >> n;
if (n <= 2) { cout << "Khong co boi so cua 3 nho hon " << n << endl; return 0; } int sum = 0; for (int i = 3; i <= n; i += 3) { sum += i; } cout << "Tong cac boi so cua 3 nho hon hoac bang " << n << " la: " << sum << endl; return 0;
}
```
bn có thể thay đk đầu vào:
#include <iostream> thành #include <bits/stdc++.h> và dùng vòng for dc ko bn