oj.uz

Submission #410735

# Submission time Handle Problem Language Result Execution time Memory
410735 2021-05-23T14:30:08 Z maximath_1 Star triangles (IZhO11_triangle) C++11
100 / 100
 358 ms 12136 KB 
#include <bits/stdc++.h>

#define kyou using
#define mo namespace
#define kawaii std
 
kyou mo kawaii;
 
#define ll long long
#define ld long double
#define endl "\n"
const int MX = 2005;
const int LG = (int)log2(MX) + 1;
const int BLOCK = 205;
const int inf = 1000000069;
const ll inf_ll = 8000000000000000069ll;
const ld inf_ld = (ld)inf_ll;
const ld eps = 1e-9;
const ll mod = 1000000007;
const int alpha = 30;
const int dxh[] = {1, 1, -1, -1, 2, 2, -2, -2};
const int dyh[] = {2, -2, 2, -2, 1, -1, 1, -1}; // horse
const int dx[] = {1, -1, 0, 0, 0, 0};
const int dy[] = {0, 0, 1, -1, 0, 0}; // adj
const int dz[] = {0, 0, 0, 0, 1, -1}; // 3d
const int dxd[] = {1, 1, 1, 0, -1, -1, -1, 0};
const int dyd[] = {1, 0, -1, -1, -1, 0, 1, 1}; // diag
mt19937 rng(time(NULL));
 
bool untied = 0;
void setIn(string s){freopen(s.c_str(), "r", stdin);}
void setOut(string s){freopen(s.c_str(), "w", stdout);}
void unsyncIO(){cin.tie(0) -> sync_with_stdio(0);}
void setIO(string s = ""){
    if(!untied) unsyncIO(), untied = 1;
    if(s.size()){
        setIn(s + ".in");
        setOut(s + ".out");
    }
}

map<int, int> cntX, cntY;

int main(){
	setIO();
	int n; cin >> n;

	vector<pair<int, int> > pt(n);
	for(int i = 0; i < n; i ++){
		cin >> pt[i].first >> pt[i].second;
		cntX[pt[i].first] ++;
		cntY[pt[i].second] ++;
	}

	ll ans = 0ll;
	for(int i = 0; i < n; i ++)
		ans += (cntX[pt[i].first] - 1) * 1ll * (cntY[pt[i].second] - 1);
	cout << ans << endl;
	return 0;
}

Compilation message

triangle.cpp: In function 'void setIn(std::string)':
triangle.cpp:31:29: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 | void setIn(string s){freopen(s.c_str(), "r", stdin);}
      |                      ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
triangle.cpp: In function 'void setOut(std::string)':
triangle.cpp:32:30: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 | void setOut(string s){freopen(s.c_str(), "w", stdout);}
      |                       ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
100.0 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 1 ms 280 KB Output is correct
3 Correct 1 ms 204 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 316 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 332 KB Output is correct
8 Correct 1 ms 332 KB Output is correct
9 Correct 1 ms 332 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 1 ms 332 KB Output is correct
12 Correct 7 ms 972 KB Output is correct
13 Correct 7 ms 972 KB Output is correct
14 Correct 12 ms 1356 KB Output is correct
15 Correct 115 ms 6096 KB Output is correct
16 Correct 125 ms 6428 KB Output is correct
17 Correct 117 ms 6084 KB Output is correct
18 Correct 116 ms 6068 KB Output is correct
19 Correct 329 ms 11544 KB Output is correct
20 Correct 250 ms 9156 KB Output is correct
21 Correct 348 ms 12136 KB Output is correct
22 Correct 358 ms 12132 KB Output is correct