Submission #26923857

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Source Code Expand

#include <bits/stdc++.h>
using namespace std;
#define N 1000005
#define int long long
#define sz(c) (int)c.size()
#define fr first
#define ll long long 
#define sc second
#define pb push_back
#define ppb pop_back
#define mp make_pair
#define all(a) (a).begin(),(a).end()
#define rep(i,a,n) for(int i=a ; i<n ; i++)
#define r0 return 0;
#define endl '\n'
#define INF (int)1e15

const int M = 1000000007;
const int U = 998244353;

/* Debug Begins */ 
# define trace(args...) { string _s = #args; replace(_s.begin(), _s.end(), ',', ' '); \
  stringstream _ss(_s); istream_iterator<string> _it(_ss); err(_it, args); }
string to_string(char c) { return "'" + string(1, c) + "'";}
string to_string(string s) { return '"' + s + '"';}
string to_string(bool f) { if(f) return "True"; else return "False";}
string to_string(const char* s) { return to_string((string) s);}
template<typename A> string to_string(A);
template<typename A, typename B> string to_string(pair<A, B> p){
  return "(" + to_string(p.first) + ": " + to_string(p.second) + ")";}
template<typename A> string to_string(A v) {bool f = false; string r = "{"; 
  for (auto x: v) {if (f) r += ", "; r += to_string(x); f = true;} return r += "}";}
template<typename A> string to_string(vector<vector<A>> v) {string r; 
  for (auto x: v) r += "\n" + to_string(x); return r;}
int Nerr;
template<typename A> string to_string(A *p) {return to_string(vector<A>(p, p + Nerr));}
void err(istream_iterator<string>) { cerr << endl; }
template<typename T,typename... Args> void err(istream_iterator<string> it, T a, Args... args) {
  cerr << *it << " = " << to_string(a) << "; "; err(++it, args...); }
template<typename T> void kek(T ans) {cout << ans << endl; exit(0);}
#define Lu(...) [&] (auto &&u) { return __VA_ARGS__; }
#define Luv(...) [&] (auto &&u, auto &&v) { return __VA_ARGS__; }
/***************************************************************/



signed main()
{
    ios_base::sync_with_stdio(0);
    int TESTS=1;
    // cin>>TESTS;
    while(TESTS--)
    {   
        int n, k;
        cin >> n >> k;
        vector<string> s(n);
        rep(i,0,n) cin >> s[i];
        sort(all(s), [&](const string& a, const string& b) {
            string s1 = a + b;
            string s2 = b + a;
            return s1 < s2;
        });
        string ans;
        rep(i,0,k) ans.append(s[i]);
        cout << ans << endl;
    }
}

Submission Info

Compile Error

./Main.cpp: In function ‘std::string to_string(std::vector<std::vector<_Tp> >)’:
./Main.cpp:34:3: warning: this ‘for’ clause does not guard... [-Wmisleading-indentation]
   34 |   for (auto x: v) r += "\n" + to_string(x); return r;}
      |   ^~~
./Main.cpp:34:45: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the ‘for’
   34 |   for (auto x: v) r += "\n" + to_string(x); return r;}
      |                                             ^~~~~~

Judge Result