#ifndef _DEBUG
#pragma GCC optimize(2)
#ifdef Full_Cpp_Compiler
#include <codecvt>
#endif
#include <sstream>
#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <memory>
#include <vector>
#include <string>
#include <algorithm>
#include <cmath>
#include <queue>
#include <cstring>
#include <fstream>
#include <Windows.h>
#include <iterator>
#include <set>
#include <process.h>
#include <ctime>
#include <utility>
#include <cctype>
#include <bitset>
#include <stdarg.h>
#define max(a,b) (a>b?a:b)
#define min(a,b) (a>b?a:b)
#endif // _DEBUG

int main() {
    std::ios_base::sync_with_stdio(false);

    std::string str;
    int pos;
    std::cin >> str;
    pos = str.size()-1;
    while (str[pos] == '0' || str[pos] == ' ') {
        pos--;
    }
    int end = 0;
    if (str[0] == '-') { std::cout << "-"; end = 1; }
    for (int i = pos; i >= end; i--) {
        std::cout << str[i];
    }
#ifdef  _DEBUG
    system("pause");
#endif //  _DEBUG
    return 0;
}

#include<iostream>
using namespace std;
int main()
{
int a,b;
b=0;
cin>>a;
do{
b=b*10+a%10;
a=a/10;
}while(a!=0);
cout<<b;
return 0;
}
此题真是水水水水水水水水水水水水水水水水水水水水水水水水水水水水水水水水水水水水水水水水水水水水水水水水水水！

Pascal超短
var i,n:longint; s:string;
begin
readln(s);
if s[1]='-' then
begin
write('-');
delete(s,1,1);
end;
for i:=length(s) downto 2 do
if s[i]<>'0' then break;
if (i=2) and (s[i]='0') then n:=i-1 else n:=i;
for i:=n downto 1 do write(s[i]);
end.

easy
```c++
评测结果
编译成功

测试数据 #0: Accepted, time = 0 ms, mem = 504 KiB, score = 10
测试数据 #1: Accepted, time = 0 ms, mem = 504 KiB, score = 10
测试数据 #2: Accepted, time = 0 ms, mem = 504 KiB, score = 10
测试数据 #3: Accepted, time = 0 ms, mem = 504 KiB, score = 10
测试数据 #4: Accepted, time = 0 ms, mem = 504 KiB, score = 10
测试数据 #5: Accepted, time = 0 ms, mem = 504 KiB, score = 10
测试数据 #6: Accepted, time = 0 ms, mem = 504 KiB, score = 10
测试数据 #7: Accepted, time = 0 ms, mem = 504 KiB, score = 10
测试数据 #8: Accepted, time = 0 ms, mem = 504 KiB, score = 10
测试数据 #9: Accepted, time = 0 ms, mem = 500 KiB, score = 10
Accepted, time = 0 ms, mem = 504 KiB, score = 100
代码
#include <cstdio>
#include <cstring>
char c[11];
int begin = 1,end,s[11];
int main() {
memset(s,0,sizeof(s));
scanf("%s",c+1);
if (c[1] == '-') printf("-"),begin = 2;
end = strlen(c+1);
memset(s,0,sizeof(s));
for (int i = begin;i <= end;i++) s[i] = c[i]-'0';
int top = 10;
while (top > 1 && !s[top]) top--;
for (int i = top;i >= begin;i--) printf("%d",s[i]);
return 0;
}
```

var
s:string;
n,i,j,ans:longint;
t:char;
begin
readln(s);
n:=length(s);
if s[1]='-' then begin
write('-');
for i:=n downto 2 do begin
if s[i]<>'0' then begin
ans:=i;
break;
end;
end;
for i:=ans downto 2 do begin
write(s[i]);
end;
exit;
end;
if s[i]<>'-' then begin
for i:=n downto 1 do begin
if s[i]<>'0' then begin
ans:=i;
break;
end;
end;
for i:=ans downto 1 do begin
write(s[i]);
end;
end;
end.

c++代码，用了点函数
#include <iostream>
#include <cstdio>
#include <cmath>
using namespace std;

int n,ans[20],temp=1;

void change(int);
void print(int);

int main()
{
cin>>n;

if (n<0){
change(abs(n));
print(0);
}else{
change(n);
print(1);
}

return 0;
}

void change(int a)
{
while (a>=10){
ans[temp]=a%10;
a/=10;
temp++;
}
ans[temp]=a;
}

void print(int b){
if (b==0){
cout<<"-";
}
int temp2=1;
while (ans[temp2]==0){
temp2++;
}
for (int i=temp2;i<=temp;i++){
cout<<ans[i];
}
cout<<endl;
}

#include<cstdio>
#include<iostream>
using namespace std;
int main(){
long long a=0;
cin>>a;
if(a<0){
a=-a;
cout<<"-";
}
if(a==0){
cout<<"0"<<endl;
}
while(a%10==0)
a=a/10;
if(a%10){
do{
cout<<a%10;
a=a/10;
}while(a);
}
return 0;
}

#include <cstdio>

int main(){
freopen("in.txt","r",stdin);
char a[2000];
int n=1;
while(scanf(" %c",&a[n])==1)
n++;
n--;
int flag=1,zero=1;
if(a[1]=='-'){
flag=0;
printf("-");
}

for(int i=n;i>=2;i--){
if(zero&&a[i]=='0')
continue;
printf("%c",a[i]);
zero=0;
}
if(flag)
printf("%c",a[1]);
return 0;
}

#include<stdio.h>
#include<iostream>
  using namespace std;

int main ()
{
    freopen("reverse.in","r",stdin);
    freopen("reverse.out","w",stdout);
    int n,f=0;
    cin>>n;
    if(n==0) cout<<0;
    else if(n<0) {n=-n;cout<<"-";goto h;}
 else 
    {
h:  while(n!=0)
       {
            int t=n%10;
            if(t!=0||f){cout<<t;f=1;}
            n/=10;
        }
    }
    return 0;
}

AC留念
pascal
var i,j,k,l:longint;
b:string;
a:array[1..13] of char;
begin
read(b); k:=length(b);
if ord(b[1])=45 then
begin
a[1]:='-';
j:=2;
write('-');
end
else j:=1;
for i:=j to k do
a[i]:=b[i];
for i:=k downto j do
begin
if a[i]<>'0' then
begin
l:=i;
end;
if a[i]<>'0' then
break;
end;
for i:=l downto j do
write(a[i]);
end.


#include<cstdio>
#include<cstring>
#include<cstdlib>
int qidian(char s)
{
if(s!='0') return 1;
else return 0;
}
main()
{
long long int N;
int i,k,j,len;
char s[15];
scanf("%lld",&N);

sprintf(s,"%lld",N);
len=strlen(s);
if(s[0]=='-') printf("-");
for(j=len-1;;j--)
{
k=qidian(s[j]);
if(k==1) break;
if(j==1&&s[0]=='-') break;
}
for(i=j;i>=0;i--)
{
if(s[i]=='-') break;
printf("%c",s[i]);

}
return 0;
}

import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        StringBuilder sb = new StringBuilder();
        sb.append(sc.nextLine());
        String str = "";
        boolean isfu=sb.substring(0, 1).toString().equals("-")?true:false;
        if (isfu) 
            str = sb.reverse().substring(0, sb.length() - 1).toString();
        else
            str = sb.reverse().toString();
        if (!str.equals("0"))
            while (str.indexOf("0") == 0)
                str =str.substring(1);
        if(isfu)
            str="-"+str;
        System.out.println(str);
    }
}

字符串有用吗
var n,m:longint;
begin
read(n);
m:=0;
while abs(n)>0 do
begin
m:=10*m+n mod 10;
n:=n div 10;
end;
write(m);
end.

晕，这么简单题被我弄复杂了，搞了老半天……

#include<stdio.h>
#include<string.h>
int main()
{
char N[20],*p=N;
int flag=1;
gets(N);
if(N[0]=='-')
printf("-");
strrev(N);
while(flag)
{
if(*p!='0')
flag=0;
else
p++;
}
while(*p!='\0')
{
if(*p!='-')
printf("%c",*p);
p++;
}
return 0;
}

AC 10题纪念

测试数据 #0: Accepted, time = 0 ms, mem = 800 KiB, score = 10

测试数据 #1: Accepted, time = 1 ms, mem = 808 KiB, score = 10

测试数据 #2: Accepted, time = 1 ms, mem = 804 KiB, score = 10

测试数据 #3: Accepted, time = 2 ms, mem = 804 KiB, score = 10

测试数据 #4: Accepted, time = 1 ms, mem = 804 KiB, score = 10

测试数据 #5: Accepted, time = 0 ms, mem = 804 KiB, score = 10

测试数据 #6: Accepted, time = 0 ms, mem = 804 KiB, score = 10

测试数据 #7: Accepted, time = 0 ms, mem = 804 KiB, score = 10

测试数据 #8: Accepted, time = 1 ms, mem = 808 KiB, score = 10

测试数据 #9: Accepted, time = 0 ms, mem = 804 KiB, score = 10

Accepted, time = 6 ms, mem = 808 KiB, score = 100

代码
var s:string;
a:array[0..10000]of longint;
i,n:longint;
begin
read(s);
n:=length(s);
if s[1]='-'then
begin
write('-');
for i:=2 to n do
a[i]:=ord(s[i])-48;
i:=n;
while a[i]=0 do
begin
n:=n-1;i:=i-1;
end;
for i:=n downto 2 do
write(a[i]);
writeln;
end
else
begin
for i:=1 to n do
a[i]:=ord(s[i])-48;
i:=n;
while a[i]=0 do
begin
n:=n-1;i:=i-1;
end;
for i:=n downto 1 do
write(a[i]);
writeln;
end;
end.

字符串搞得我头晕
#include <stdio.h>

int main(){
int i,l;
char c[1000];
scanf("%s",&c);
for(l=0;;l++)
if(c[l]=='\0')
break;
int flag=0;
if(c[0]!='-'){
for(i=l-1;i>=0;i--){
if(c[i]!='0'){
flag++;
printf("%d",c[i]-'0');
}

if(c[i]=='0')
if(flag)
printf("%d",c[i]-'0');
}
}
if(c[0]=='-'){
printf("-");
for(i=l-1;i>0;i--){
if(c[i]!='0'){
flag++;
printf("%d",c[i]-'0');
}

if(c[i]=='0')
if(flag)
printf("%d",c[i]-'0');
}
}

return 0;
}

#include<iostream>
using namespace std;
int main()
{
int k;
bool flag=false;
scanf("%d",&k);
if(k<0)
{
printf("-");
k=0-k;
}
while(k)
{
// 前导0
int out;
out = k%10;

if(out==0 && flag)
printf("0");
else if(out!=0)
{
flag = true;
printf("%d",out);
}
k/=10;
}
}

###水题啊

评测状态 Accepted
题目 P1756 数字反转
递交时间 2015-09-10 14:46:53
代码语言 C++
评测机 VijosEx
消耗时间 29 ms
消耗内存 520 KiB
评测时间 2015-09-10 14:46:54
评测结果
编译成功

测试数据 #0: Accepted, time = 0 ms, mem = 520 KiB, score = 10
测试数据 #1: Accepted, time = 0 ms, mem = 516 KiB, score = 10
测试数据 #2: Accepted, time = 0 ms, mem = 516 KiB, score = 10
测试数据 #3: Accepted, time = 14 ms, mem = 516 KiB, score = 10
测试数据 #4: Accepted, time = 15 ms, mem = 512 KiB, score = 10
测试数据 #5: Accepted, time = 0 ms, mem = 516 KiB, score = 10
测试数据 #6: Accepted, time = 0 ms, mem = 516 KiB, score = 10
测试数据 #7: Accepted, time = 0 ms, mem = 512 KiB, score = 10
测试数据 #8: Accepted, time = 0 ms, mem = 516 KiB, score = 10
测试数据 #9: Accepted, time = 0 ms, mem = 512 KiB, score = 10
Accepted, time = 29 ms, mem = 520 KiB, score = 100
代码
#include <iostream>
#include <cstdio>
#include <string.h>
using namespace std;
char s[20];
int main()
{
scanf("%s",s);
int len=strlen(s)-1;
if(s[0]=='-')
{
printf("-");
for(;s[len]=='0';len--);
for(int i=len;i>=1;i--) printf("%c",s[i]);
return 0;
}

if(len==0&&s[1]==0){
printf("0");
return 0;
}

for(;s[len]=='0';len--);
for(int i=len;i>=0;i--) printf("%c",s[i]);
}

注意开头是0的特殊判断，然后如果0包含在中间别忘记输出！
#include<iostream>
#include<cstdio>
#include<cstring>
#include<math.h>
using namespace std;
int main()
{
bool b=0;
int lena,i=0,j;
char a[1000];
scanf("%s",a);
lena=strlen(a);
if(a[0]=='0'){
printf("0");
return 0;
}
if(a[0]=='-'){
printf("-");
i++;
}
for(j=lena-1;j>=i;j--){
if(a[j]=='0'&&!b){
continue;
}
else{
b=1;
printf("%c",a[j]);
}

}
return 0;
}