Submission #671103

#	Time	Username	Problem	Language	Result	Execution time	Memory
671103		gavgav	Star triangles (IZhO11_triangle)	C++17	100 / 100	272 ms	12160 KiB

triangle

#include <bits/stdc++.h>
using namespace std;
#define ll long long

struct point{
    int x, y;
};
int main(){
    int pointsNumber; scanf("%d", &pointsNumber);

    point points[pointsNumber];
    map <int, int> pointsInRow, pointsInColumn;
    for (int i = 0; i < pointsNumber; ++i){
        scanf("%d%d", &(points[i].x), &(points[i].y));
        ++pointsInRow[points[i].y];
        ++pointsInColumn[points[i].x];
    }

    ll trianglesNumber = 0;
    for (int i = 0; i < pointsNumber; ++i){
        trianglesNumber += (pointsInColumn[points[i].x] - 1) * (pointsInRow[points[i].y] - 1);
    }

    printf("%lld", trianglesNumber);
}

Compilation message (stderr)

triangle.cpp: In function 'int main()':
triangle.cpp:9:28: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 |     int pointsNumber; scanf("%d", &pointsNumber);
      |                       ~~~~~^~~~~~~~~~~~~~~~~~~~~
triangle.cpp:14:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |         scanf("%d%d", &(points[i].x), &(points[i].y));
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100