CodeForces 34C Page Numbers

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#include <iostream>#include <cstdlib>#include <cstring>#include <string>#include <cstdio>#include <cmath>#include <algorithm>#include <vector>#include <queue>#include <map>#define inf 0x3f3f3f3f#pragma comment(linker, "/STACK:16777216")#define eps 1e-6#define ll long longusing namespace std;inline int ReadInt(){    char ch = getchar();    if (ch==EOF) return -1;    int data = 0;    while (ch < '0' || ch > '9')    {        ch = getchar();        if (ch==EOF) return -1;    }    do    {        data = data*10 + ch-'0';        ch = getchar();    } while (ch >= '0' && ch <= '9');    return data;}int s[110];int main(){    int i=0,n;    while((s[i]=ReadInt())!=-1) i++;    n=i;    sort(s,s+n);    printf("%d",s[0]);    int flag=0;    for(i=1;i<n;i++)    {        if(s[i]==s[i-1]) continue;        if(s[i]-s[i-1]==1)        {            if(flag) continue;            else            {                flag=1;                printf("-");                continue;            }        }        if(flag==1)        {            flag=0;            printf("%d",s[i-1]);        }        printf(",%d",s[i]);    }    if(flag==1)    {        flag=0;        printf("%d",s[i-1]);    }    puts("");    return 0;}
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