이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll,ll> ii;
#define REP(i, n) for(int i = 0;i < n;i ++)
#define REP1(i, n) for(int i = 1;i <= n;i ++)
#define FILL(i, n) memset(i, n, sizeof(i))
#define X first
#define Y second
#define pb push_back
#define SZ(_a) ((int)(_a).size())
#define ALL(_a) (_a).begin(), (_a).end()
#ifdef brian
#define IOS()
template<typename T>void _do(T &&x){cerr<<x<<endl;}
template<typename T, typename ...t>void _do(T &&x, t &&...X){cerr<<x<<", ";_do(X...);}
#define debug(...) {\
fprintf(stderr, "%s - %d (%s) = ", __PRETTY_FUNCTION__, __LINE__, #__VA_ARGS__);\
_do(__VA_ARGS__);\
}
#else
#define debug(...)
#define IOS() ios_base::sync_with_stdio(0);cin.tie(0);
#define endl '\n'
#endif
const ll MAXn = 1e5 + 5;
const ll INF = ll(1e18);
const ll MOD = 1000000007;
ll a[MAXn], b[MAXn], c[MAXn];
map<ii, ll> mp;
vector<ii> dt;
ll n, m;
ll laps(ii x, ll sx, ii y, ll sy)
{
vector<ii> v1, v2;
debug(x.X, x.Y, sx, y.X, y.Y, sy);
if(sx)v1.pb(ii(1, x.X)), v1.pb(ii(x.Y, n + 1));
else v1.pb(x);
if(sy)v2.pb(ii(1, y.X)), v2.pb(ii(y.Y, n + 1));
else v2.pb(y);
for(auto &p:v1)debug(p.X, p.Y);
for(auto &q:v2)debug(q.X, q.Y);
for(auto &p:v1)for(auto &q:v2)if(!(p.Y <= q.X || q.Y <= p.X))return 1;
debug("no");
return 0;
}
int main(){
IOS();
cin>>n>>m;
REP1(i, m)cin>>a[i]>>b[i]>>c[i];
REP1(i, m)if(a[i] > b[i])swap(a[i], b[i]);
REP1(i, m)mp[ii(a[i], b[i])]++;
ll tmptt = 0;
for(auto &p:mp)REP(i, p.Y)dt.pb(p.X);
ll mx = 0;
for(int i = 1;i <= n;i ++)for(int j = 1;j < i;j ++)
{
ll ct = 0;
for(auto &p:dt)if((i >= p.X && i < p.Y) ^ (j >= p.X && j < p.Y))ct ++;
mx = max(mx, ct / 2 + ct % 2);
}
cout<<mx + tmptt<<endl;
}
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