Submission #19460

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
19460	2016-02-24T12:59:54 Z	nosiar	Σ (kriii4_P2)	C++	Compilation error	0 ms	0 KB

P2

#include <iostream>
#include <tuple>
using namespace std;
long long mod = 1000000007;
long long m,n,s;
tuple<long long, long long, long long> extended_gcd(long long a, long long b)
{
    if (b == 0)
        return tuple<long long, long long, long long> { a, 1, 0 };

    auto r = extended_gcd(b, a % b);

    long long d = get<0>(r);
    long long x = get<1>(r);
    long long y = get<2>(r);

    return tuple<long long, long long, long long>{ d, y, x - a/b*y };
}

/* a has a (unique) multiplicative inverse iif gcd(a,n)=1 */
long long inverse(long long a)
{
    auto r = extended_gcd(a, mod);
    if (get<0>(r) != 1) return -1;
    return get<1>(r);
}
int main() {
	cin >> m;
	long long ans = 0;
	for(int i = 0; i < m; ++i)
	{
		cin>>n>>s;
		int inv_n = inverse(n);
		ans = (ans+(s*inv_n))%mod;
	}
	cout << ans << endl;
	
	return 0;
}

Compilation message

In file included from /usr/include/c++/4.9/tuple:35:0,
                 from P2.cpp:2:
/usr/include/c++/4.9/bits/c++0x_warning.h:32:2: error: #error This file requires compiler and library support for the ISO C++ 2011 standard. This support is currently experimental, and must be enabled with the -std=c++11 or -std=gnu++11 compiler options.
 #error This file requires compiler and library support for the \
  ^
P2.cpp:6:1: error: ‘tuple’ does not name a type
 tuple<long long, long long, long long> extended_gcd(long long a, long long b)
 ^
P2.cpp: In function ‘long long int inverse(long long int)’:
P2.cpp:23:5: warning: ‘auto’ changes meaning in C++11; please remove it [-Wc++0x-compat]
     auto r = extended_gcd(a, mod);
     ^
P2.cpp:23:10: error: ‘r’ does not name a type
     auto r = extended_gcd(a, mod);
          ^
P2.cpp:24:9: error: ‘get’ was not declared in this scope
     if (get<0>(r) != 1) return -1;
         ^
P2.cpp:24:16: error: ‘r’ was not declared in this scope
     if (get<0>(r) != 1) return -1;
                ^
P2.cpp:25:12: error: ‘get’ was not declared in this scope
     return get<1>(r);
            ^
P2.cpp:25:19: error: ‘r’ was not declared in this scope
     return get<1>(r);
                   ^
P2.cpp:26:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^