TEMPLATE FUNCTIONS:

stdin = lambda type_ = "int", sep = " ": list(map(eval(type_), raw_input().split(sep)))
"""
>>> stdin()
1 2 3 4
>>>[1, 2, 3, 4]
"""

joint = lambda sep = " ", *args: sep.join(str(i) if type(i) != list else sep.join(map(str, i)) for i in args)
"""
>>> joint(" ", [1, 2])
'1 2'
>>> joint(" ", [1, 2], [2, 3])
'1 2 2 3'
"""

def iters(): return map(int(raw_input()))

PROBLEMS:

==================

http://codeforces.net/contest/988/problem/B

n = int(input())
a = sorted((input() for _ in range(n)), key=lambda x: len(x))
v = all(a[i] in a[i+1] for i in range(n-1))
print('YES\n'+"\n".join(a) if v else 'NO')

==================

http://codeforces.net/contest/994/problem/A

R = lambda: (int, input().split())
n, a, b = R(), R(), R()
print(' '.join(map(str, (x for x in a if x in b))))

==================

http://codeforces.net/contest/994/problem/B

R = lambda: map(int, input().split())
n, k = R(), 
v, t = [], [0]*n
for p, c, i in sorted(zip(R(), R(), range(n))):
    t[i] = sum(v)+c
    v += [c]
    v = sorted(v)[::-1]
    if len(v) > k:
        v.pop()
print(' '.join(map(str, t)))

==================

http://codeforces.net/contest/754/problem/A

n, a = int(input()), list(map(int, input().split()))
x = next((i for i, ai in enumerate(a) if ai), None) # find index of first non-zero elements in a
if x is None:
    print('NO')
elif sum(a):
    print('YES', 1, '1 {}'.format(n), sep='\n')
else:
    print('YES', 2, '1 {}'.format(x + 1), '{} {}'.format(x + 2, n), sep='\n')

==================

http://codeforces.net/contest/996/problem/B

import math
n, a, m, res = int(input()), [*(map(int,input().split()))], 10e9,-1
k = [ math.ceil((ai-i)/n) for i,ai in enumerate(a) ]
print(k.index(min(k))+1)

==================

https://codeforces.net/contest/1082/problem/B

_, string = raw_input(), raw_input()
start, end, res = 0, 0, 0
for char in string:
    if char == "G": start += 1
    else: end, start = start, 0
    res = max(res, start + end + 1)
print min(res, string.count("G"))

==================

https://codeforces.net/contest/1082/problem/B

x = int(raw_input())
print " ".join(map(str, [x, x])) if x != 1 else -1

==================

https://codeforces.net/contest/1082/problem/B

n, k = map(int, raw_input().split())
numbers = map(int, raw_input().split())
res, numbers = [], [0] + sorted(list(set(numbers)))
for i in xrange(min(len(numbers) - 1, k)): print (numbers[i + 1] - numbers[i])
for _ in xrange(k - len(numbers) + 1): print 0

==================

https://codeforces.net/contest/1092/problem/A

for _ in iters():
    n, k = stdin()
    print joint('', ([chr(ord('a') + i%k) for i in xrange(n)]))

==================

*find more here https://github.com/SolbiatiAlessandro/pyComPro

The following code (problem B of last contest) give different outputs if compiled with different versions of C++11/C++14, only on this specific input

42147 412393322

why is that?

(I included the header only for reference)

//START HEADER ---------------------------------------------

using namespace std;
#define int int64_t
#define rep(i, begin, end) for (__typeof(end) i = (begin) - ((begin) > (end)); i != (end) - ((begin) > (end)); i += 1 - 2 * ((begin) > (end)))
#define EPS 1e-7
#define INF 1e9
#define foor(n) for (int i=0;i<n;i++)
#define fooor(a,n) for (int i=a;i<n;i++)
#define per(a,n) for (int i=n-1;i>=a;i--)
#define pb push_back
#define mp make_pair
#define all(x) (x).begin(),(x).end()
#define fi first
#define se second
#define ssz(x) ((int)(x).size())
#define pc(x) putchar(x)
//#define PI acos(-1);
typedef pair<int,int> ii;
typedef vector<int> vi;
typedef vector<pair<int,int>> vii;
typedef vector<vector<int>> vvi;
typedef long long ll;
typedef unsigned long long ull;
const ll mod=1000000007;
ll powmod(ll a,ll b) {ll res=1;a%=mod; assert(b>=0); for(;b;b>>=1){if(b&1)res=res*a%mod;a=a*a%mod;}return res;}
namespace ib {char b[100];}
inline void pi(int x){ //fasto
    if(x==0) {pc(48); return;}
    if(x<0) {pc('-'); x=-x;}
    char *s=ib::b;
    while(x) *(++s)=x%10,x/=10;
    while(s!=ib::b) pc((*(s--))+48);
}
inline void ri(int &x){ //fasti
    x=0; static char c; bool t(0);
    while(c=getchar(),c<'0'||c>'9') if(c=='-') t=1; else t=0;
    do x=(x<<1)+(x<<3)+c-'0'; while(c=getchar(),c>='0'&&c<='9');
    if(t) x=-x;
}
//#define cerr if(0)cerr
#define error(args...) { vector<string> _v = split(#args, ','); err(_v.begin(), args); }
vector<string> split(const string& s, char c) {
    vector<string> v;
    stringstream ss(s);
    string x;
    while (getline(ss, x, c))
        v.emplace_back(x);
    return move(v);
}
void err(vector<string>::iterator it) {}
template<typename T, typename... Args>
void err(vector<string>::iterator it, T a, Args... args) {
    cerr << it -> substr((*it)[0] == ' ', it -> length()) << " = " << a << '\n';
    err(++it, args...);
}

// FINISH HEADER ---------------------------------------------------------------------------------------

string itoa(int n){
    string res = "";
    int r=-1;
    while(n/10!=0){
        r=n%10;
        res+=char(r+'0');
        n/=10;
    }
    r=n%10;
    res+=char(r+'0');
    reverse(all(res));
    return res;
}

int aatoi(string s){
    int res=0;
    foor(ssz(s)){
        res+=(int)(s[i]-'0')*pow(10, i);
    }
    //   error(s,res);
    return res;
    
}


int32_t main(){
    int n,m;
    cin >> n >> m;
    int res=0;
    foor(n+1){
        
        string s = itoa(i);
        string r = s;
        reverse(all(r));
        s=s+r;
        //error(aatoi(s.c_str()));
        res+=aatoi(s.c_str());
    }
    return cout<<res% (1ll * m),0;
}