oj.uz

Submission #107067

# Submission time Handle Problem Language Result Execution time Memory
107067 2019-04-21T16:23:08 Z someone_aa Star triangles (IZhO11_triangle) C++17
100 / 100
 1049 ms 76364 KB 
#include <bits/stdc++.h>
#define ll long long
#define pb push_back
#define mp make_pair
using namespace std;
const int maxn = 300100;
int x[maxn], y[maxn];
int n;

set<int>xst, yst;
map<int,int>xind, yind, cnt[maxn];

vector<int>xx[maxn], yy[maxn];

int main() {
  	ios_base::sync_with_stdio(false);
  	cin.tie(0);
    cin>>n;
    for(int i=1;i<=n;i++) {
        cin>>x[i]>>y[i];

        xst.insert(x[i]);
        yst.insert(y[i]);
    }

    int br = 1;
    for(int i:xst) {
        xind[i] = br++;
    }

    br = 1;
    for(int i:yst) {
        yind[i] = br++;
    }

    for(int i=1;i<=n;i++) {
        x[i] = xind[x[i]];
        y[i] = yind[y[i]];

        xx[x[i]].pb(y[i]);
        yy[y[i]].pb(x[i]);
    }

    for(int i=1;i<=n;i++) {
        sort(yy[i].begin(), yy[i].end());
        sort(xx[i].begin(), xx[i].end());

        int br = 0;
        for(int j:yy[i]) {
            cnt[i][j] = br++;
        }
    }

    ll result = 0LL;
    for(int i=1;i<=n;i++) {
        int br = 0;
        for(int j:xx[i]) {
            int curr_x = i;
            int curr_y = j;

            int lcnt = cnt[i][j];
            int rcnt = yy[curr_y].size() - lcnt - 1;

            int dcnt = br;
            int ucnt = xx[i].size() - br - 1;

            ll temp = 0LL;
            temp += 1LL * lcnt * ucnt;
            temp += 1LL * lcnt * dcnt;
            temp += 1LL * rcnt * ucnt;
            temp += 1LL * rcnt * dcnt;
            result += temp;
            br++;
        }
    }
    cout<<result<<"\n";
    return 0;
}

Compilation message

triangle.cpp: In function 'int main()':
triangle.cpp:58:17: warning: unused variable 'curr_x' [-Wunused-variable]
             int curr_x = i;
                 ^~~~~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 25 ms 28544 KB Output is correct
2 Correct 25 ms 28544 KB Output is correct
3 Correct 25 ms 28544 KB Output is correct
4 Correct 26 ms 28544 KB Output is correct
5 Correct 25 ms 28504 KB Output is correct
6 Correct 28 ms 28544 KB Output is correct
7 Correct 27 ms 28580 KB Output is correct
8 Correct 26 ms 28664 KB Output is correct
9 Correct 28 ms 28684 KB Output is correct
10 Correct 30 ms 28664 KB Output is correct
11 Correct 31 ms 28792 KB Output is correct
12 Correct 47 ms 30968 KB Output is correct
13 Correct 39 ms 31096 KB Output is correct
14 Correct 62 ms 32080 KB Output is correct
15 Correct 396 ms 49144 KB Output is correct
16 Correct 449 ms 50424 KB Output is correct
17 Correct 411 ms 49040 KB Output is correct
18 Correct 407 ms 49144 KB Output is correct
19 Correct 845 ms 73468 KB Output is correct
20 Correct 767 ms 62924 KB Output is correct
21 Correct 918 ms 76364 KB Output is correct
22 Correct 1049 ms 76284 KB Output is correct