my code:
#include<bits/stdc++.h>
using namespace std;

typedef long long                   ll;
typedef pair<int,int>               pii;
typedef pair<ll,ll>                 pll;
typedef pair<string , string>       pss;

#define all(x)                      (x).begin(),(x).end()
#define Sort(x)                     sort(all((x)))
#define F                           first
#define S                           second
#define sep                         ' '
#define file_io                     freopen("input.txt" , "r+" , stdin) ; freopen("output.txt" , "w+" , stdout);
#define fast_io                     ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define error(x)                    cerr << "$$$ " << x << '\n';
#define error2(x,y)                 cerr << "#F : " << x << "      #S : " << y << '\n';
#define pb                          push_back

const ll MX5 = 3*1e5+3;
const ll MX6 = 2*1e6+3;
const ll INF = 8e18;
const ll MOD = 1e9 + 7;
const ll MOD2= 998244353;

ll power(ll a, ll b, ll md) {
    return (!b ? 1 : (b & 1 ? a * power(a * a % md, b / 2, md) % md : power(a * a % md, b / 2, md) % md));
}
ll bmm(ll a,ll b){
    return (a%b==0 ? b : bmm(b,a%b));
}

ll A[MX5];


string num(ll n){
    string ans="";
    while(n){
        ans=(char)(n%10+'0')+ans;
        n/=10;
    }
    return ans;
}

string An(ll t,ll n){
    string a=num(t);
    if(t==n){
        return "sin("+a+")";
    }
    if(t%2==1){
        return "sin("+a+"-"+An(t+1,n)+")";
    }
    return "sin("+a+"+"+An(t+1,n)+")";
}
string Sn(ll t,ll n){
    string a=num(n-t+1);
    if(t==1){
        return An(1,1)+"+"+a;
    }
    return "("+Sn(t-1,n)+")"+An(1,t)+"+"+a;
}
int main(){
    fast_io
    //file_io
    ll n;
    cin >> n;
    string answer=Sn(n,n);
    cout << answer;
    return 0;
}

Edited by author 12.08.2019 13:01

i find out its because of language of compiler
use G++ 7.1 for c++ :)