# include <bits/stdc++.h>
using namespace std;
using ll = long long;
using db = long double; // or double, if TL is tight
using str = string; // yay python!
// pairs
using pii = pair<int,int>;
using pl = pair<ll,ll>;
using pd = pair<db,db>;
#define mp make_pair
#define f first
#define s second
#define tcT template<class T
#define tcTU tcT, class U
// ^ lol this makes everything look weird but I'll try it
tcT> using V = vector<T>;
tcT, size_t SZ> using AR = array<T,SZ>;
using vi = V<int>;
using vb = V<bool>;
using vl = V<ll>;
using vd = V<db>;
using vs = V<str>;
using vpi = V<pii>;
using vpl = V<pl>;
using vpd = V<pd>;
// vectors
// oops size(x), rbegin(x), rend(x) need C++17
#define sz(x) int((x).size())
#define bg(x) begin(x)
#define all(x) bg(x), end(x)
#define rall(x) x.rbegin(), x.rend()
#define sor(x) sort(all(x))
#define rsz resize
#define ins insert
#define pb push_back
#define eb emplace_back
#define ft front()
#define bk back()
#define lb lower_bound
#define ub upper_bound
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define rep(a) F0R(_,a)
#define each(a,x) for (auto& a: x)
const int MOD = 998244353;
const int MX = 2e5+5;
const ll BIG = 1e18; // not too close to LLONG_MAX
const db PI = acos((db)-1);
const int dx[4]{1,0,-1,0}, dy[4]{0,1,0,-1}; // for every grid problem!!
mt19937 rng((uint32_t)chrono::steady_clock::now().time_since_epoch().count());
template<class T> using pqg = priority_queue<T,vector<T>,greater<T>>;
struct DSU {
vi e; void init(int N) { e = vi(N,-1); }
int get(int x) { return e[x] < 0 ? x : e[x] = get(e[x]); }
bool sameSet(int a, int b) { return get(a) == get(b); }
int size(int x) { return -e[get(x)]; }
bool unite(int x, int y) { // union by size
x = get(x), y = get(y); if (x == y) return 0;
if (e[x] > e[y]) swap(x,y);
e[x] += e[y]; e[y] = x; return 1;
}
};
/*
inline namespace Helpers {
//////////// is_iterable
// https://stackoverflow.com/questions/13830158/check-if-a-variable-type-is-iterable
// this gets used only when we can call begin() and end() on that type
tcT, class = void> struct is_iterable : false_type {};
tcT> struct is_iterable<T, void_t<decltype(begin(declval<T>())),
decltype(end(declval<T>()))
>
> : true_type {};
tcT> constexpr bool is_iterable_v = is_iterable<T>::value;
//////////// is_readable
tcT, class = void> struct is_readable : false_type {};
tcT> struct is_readable<T,
typename std::enable_if_t<
is_same_v<decltype(cin >> declval<T&>()), istream&>
>
> : true_type {};
tcT> constexpr bool is_readable_v = is_readable<T>::value;
//////////// is_printable
// // https://nafe.es/posts/2020-02-29-is-printable/
tcT, class = void> struct is_printable : false_type {};
tcT> struct is_printable<T,
typename std::enable_if_t<
is_same_v<decltype(cout << declval<T>()), ostream&>
>
> : true_type {};
tcT> constexpr bool is_printable_v = is_printable<T>::value;
}*/
using ll = long long;
using db = long double; // or double, if TL is tight
using str = string; // yay python!
// pairs
using pii = pair<int,int>;
using pl = pair<ll,ll>;
using pd = pair<db,db>;
#define mp make_pair
#define f first
#define s second
#define tcT template<class T
#define tcTU tcT, class U
// ^ lol this makes everything look weird but I'll try it
tcT> using V = vector<T>;
tcT, size_t SZ> using AR = array<T,SZ>;
using vi = V<int>;
using vb = V<bool>;
using vl = V<ll>;
using vd = V<db>;
using vs = V<str>;
using vpi = V<pii>;
using vpl = V<pl>;
using vpd = V<pd>;
// vectors
// oops size(x), rbegin(x), rend(x) need C++17
#define sz(x) int((x).size())
#define bg(x) begin(x)
#define all(x) bg(x), end(x)
#define rall(x) x.rbegin(), x.rend()
#define sor(x) sort(all(x))
#define rsz resize
#define ins insert
#define pb push_back
#define eb emplace_back
#define ft front()
#define bk back()
#define lb lower_bound
#define ub upper_bound
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define rep(a) F0R(_,a)
#define each(a,x) for (auto& a: x)
template<class T> using pqg = priority_queue<T,vector<T>,greater<T>>;
/*
inline namespace Helpers {
//////////// is_iterable
// https://stackoverflow.com/questions/13830158/check-if-a-variable-type-is-iterable
// this gets used only when we can call begin() and end() on that type
tcT, class = void> struct is_iterable : false_type {};
tcT> struct is_iterable<T, void_t<decltype(begin(declval<T>())),
decltype(end(declval<T>()))
>
> : true_type {};
tcT> constexpr bool is_iterable_v = is_iterable<T>::value;
//////////// is_readable
tcT, class = void> struct is_readable : false_type {};
tcT> struct is_readable<T,
typename std::enable_if_t<
is_same_v<decltype(cin >> declval<T&>()), istream&>
>
> : true_type {};
tcT> constexpr bool is_readable_v = is_readable<T>::value;
//////////// is_printable
// // https://nafe.es/posts/2020-02-29-is-printable/
tcT, class = void> struct is_printable : false_type {};
tcT> struct is_printable<T,
typename std::enable_if_t<
is_same_v<decltype(cout << declval<T>()), ostream&>
>
> : true_type {};
tcT> constexpr bool is_printable_v = is_printable<T>::value;
}*/
int t,n,a[N][N],col[N],fix[N],ff,m;
vector <pii> v[N];
void dfs(int a, int p, int cur) {
fix[a] = 1;
col[a] = cur;
for (pii x : v[a]) {
int to = x.f; int c = x.s;
if (!fix[to]) {
col[to] = cur ^ c;
dfs(to,a,col[to]);
} else {
if (col[to] != (cur ^ c)) {
ff = 1;
return ;
}
}
}
}
main() {
std::ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0);
cin>>n>>m;
for (int i = 1; i <= m; i++) {
int x,y;
cin>>x>>y;
a[x][y] = 1;
}
for (int i = 1; i <= n; i++) {
for (int j = i + 1; j <= n; j++) {
if (a[i][j] == 0) v[i].pb({j,1}), v[j].pb({i,1});
else v[i].pb({j,0}), v[j].pb({i,0});
}
}
dfs(1,0,0);
if (!ff) {
cout<<"DA\n";
exit(0);
}
for (int i = 1; i <= n; i++) fix[i] = 0;
ff = 0;
dfs(1,0,1);
if (!ff) {
cout<<"DA\n";
exit(0);
}
cout<<"NE\n";
}
Compilation message
ronald.cpp:181:11: error: 'N' was not declared in this scope
181 | int t,n,a[N][N],col[N],fix[N],ff,m;
| ^
ronald.cpp:181:14: error: 'N' was not declared in this scope
181 | int t,n,a[N][N],col[N],fix[N],ff,m;
| ^
ronald.cpp:181:21: error: 'N' was not declared in this scope
181 | int t,n,a[N][N],col[N],fix[N],ff,m;
| ^
ronald.cpp:181:28: error: 'N' was not declared in this scope
181 | int t,n,a[N][N],col[N],fix[N],ff,m;
| ^
ronald.cpp:182:16: error: 'N' was not declared in this scope
182 | vector <pii> v[N];
| ^
ronald.cpp: In function 'void dfs(int, int, int)':
ronald.cpp:184:2: error: 'fix' was not declared in this scope
184 | fix[a] = 1;
| ^~~
ronald.cpp:185:2: error: 'col' was not declared in this scope; did you mean 'cosl'?
185 | col[a] = cur;
| ^~~
| cosl
ronald.cpp:186:15: error: 'v' was not declared in this scope
186 | for (pii x : v[a]) {
| ^
ronald.cpp: At global scope:
ronald.cpp:199:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
199 | main() {
| ^~~~
ronald.cpp: In function 'int main()':
ronald.cpp:205:6: error: 'a' was not declared in this scope
205 | a[x][y] = 1;
| ^
ronald.cpp:209:8: error: 'a' was not declared in this scope
209 | if (a[i][j] == 0) v[i].pb({j,1}), v[j].pb({i,1});
| ^
ronald.cpp:209:22: error: 'v' was not declared in this scope
209 | if (a[i][j] == 0) v[i].pb({j,1}), v[j].pb({i,1});
| ^
ronald.cpp:210:9: error: 'v' was not declared in this scope
210 | else v[i].pb({j,0}), v[j].pb({i,0});
| ^
ronald.cpp:218:31: error: 'fix' was not declared in this scope
218 | for (int i = 1; i <= n; i++) fix[i] = 0;
| ^~~
