Submission #337507

#	Time	Username	Problem	Language	Result	Execution time	Memory
337507		beksultan04	Star triangles (IZhO11_triangle)	C++14	100 / 100	341 ms	10832 KiB

triangle

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define pii pair<int,int>
#define OK puts("OK");
#define NO puts("NO");
#define YES puts("YES");
#define fr first
#define sc second
#define ret return
#define scan1(a) scanf("%lld",&a);
#define scan2(a,b) scanf("%lld %lld",&a, &b);
#define scan3(a,b,c) scanf("%lld %lld %lld",&a,&b,&c);
#define all(s) s.begin(),s.end()
#define allr(s) s.rbegin(),s.rend()
#define pb push_back
#define sz(v) (int)v.size()
#define endi puts("");
const int N = 1e6+12,INF=1e9+7;
int dp[N],x[N],y[N];

main(){
    int n,i,j,ans=0;
    scan1(n)
    vector <int> a,b;
    for (i=0;i<n;++i){
        scan2(x[i],y[i])
        a.pb(x[i]);
        b.pb(y[i]);
    }
    sort(all(a));
    sort(all(b));
    for (i=0;i<n;++i){
        int l1 = lower_bound(all(a),x[i])-a.begin();
        int r1 = upper_bound(all(a),x[i])-a.begin()-1;
        int l2 = lower_bound(all(b),y[i])-b.begin();
        int r2 = upper_bound(all(b),y[i])-b.begin()-1;
        ans += (r2-l2)*(r1-l1);

    }
    cout <<ans;
}

Compilation message (stderr)

triangle.cpp:22:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   22 | main(){
      |      ^
triangle.cpp: In function 'int main()':
triangle.cpp:23:13: warning: unused variable 'j' [-Wunused-variable]
   23 |     int n,i,j,ans=0;
      |             ^
triangle.cpp:11:23: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   11 | #define scan1(a) scanf("%lld",&a);
      |                  ~~~~~^~~~~~~~~~~
triangle.cpp:24:5: note: in expansion of macro 'scan1'
   24 |     scan1(n)
      |     ^~~~~
triangle.cpp:12:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   12 | #define scan2(a,b) scanf("%lld %lld",&a, &b);
      |                    ~~~~~^~~~~~~~~~~~~~~~~~~~
triangle.cpp:27:9: note: in expansion of macro 'scan2'
   27 |         scan2(x[i],y[i])
      |         ^~~~~

• Subtask 1: 100 / 100