Submission #671664

#	Time	Username	Problem	Language	Result	Execution time	Memory
671664		ReLice	Star triangles (IZhO11_triangle)	C++14	100 / 100	305 ms	12668 KiB

triangle

#include<bits/stdc++.h>
using namespace std;
#define endl "\n"
#define ll long long
#define ld long double
#define pb push_back
#define sz size()
#define fr first
#define sc second
//#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
void fre(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
void start(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
}
const ll mod=998244353;
const ll inf=1e18;
const ll N=1e5+10;
void solve(){
    ll n,i,mx=-1,mn=inf,x,y;
    cin>>n;
    vector <pair<ll,ll>> v;
    map<ll,ll> mpx,mpy;
    for(i=0;i<n;i++){
        cin>>x>>y;
        mpx[x]++;
        mpy[y]++;
        v.pb({x,y});
    }
    ll ans=0;
    for(auto i : v){
        ans+=((mpx[i.fr]-1)*(mpy[i.sc]-1));
    }
    cout<<ans<<endl;
}
signed main(){
    //  fre("divide");
    start();
    ll t=1;
    //cin>>t;
    while(t--) solve();
}

Compilation message (stderr)

triangle.cpp: In function 'void solve()':
triangle.cpp:21:12: warning: unused variable 'mx' [-Wunused-variable]
   21 |     ll n,i,mx=-1,mn=inf,x,y;
      |            ^~
triangle.cpp:21:18: warning: unused variable 'mn' [-Wunused-variable]
   21 |     ll n,i,mx=-1,mn=inf,x,y;
      |                  ^~
triangle.cpp: In function 'void fre(std::string)':
triangle.cpp:11:27: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 | void fre(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
      |                    ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
triangle.cpp:11:64: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 | void fre(string s){freopen((s+".in").c_str(),"r",stdin);freopen((s+".out").c_str(),"w",stdout);}
      |                                                         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100