fork(1) download
  1. /***********Template Starts Here***********/
  2. #include <bits/stdc++.h>
  3.  
  4. #define pb push_back
  5. #define nl puts ("")
  6. #define sp printf ( " " )
  7. #define phl printf ( "hello\n" )
  8. #define ff first
  9. #define ss second
  10. #define POPCOUNT __builtin_popcountll
  11. #define RIGHTMOST __builtin_ctzll
  12. #define LEFTMOST(x) (63-__builtin_clzll((x)))
  13. #define MP make_pair
  14. #define FOR(i,x,y) for(vlong i = (x) ; i <= (y) ; ++i)
  15. #define ROF(i,x,y) for(vlong i = (y) ; i >= (x) ; --i)
  16. #define CLR(x,y) memset(x,y,sizeof(x))
  17. #define UNIQUE(V) (V).erase(unique((V).begin(),(V).end()),(V).end())
  18. #define MIN(a,b) ((a)<(b)?(a):(b))
  19. #define MAX(a,b) ((a)>(b)?(a):(b))
  20. #define NUMDIGIT(x,y) (((vlong)(log10((x))/log10((y))))+1)
  21. #define SQ(x) ((x)*(x))
  22. #define ABS(x) ((x)<0?-(x):(x))
  23. #define FABS(x) ((x)+eps<0?-(x):(x))
  24. #define ALL(x) (x).begin(),(x).end()
  25. #define LCM(x,y) (((x)/gcd((x),(y)))*(y))
  26. #define SZ(x) ((vlong)(x).size())
  27. #define NORM(x) if(x>=mod)x-=mod;
  28.  
  29. using namespace std;
  30.  
  31. typedef long long vlong;
  32. typedef unsigned long long uvlong;
  33. typedef pair < int, int > pii;
  34. typedef pair < vlong, vlong > pll;
  35. typedef vector<pii> vii;
  36. typedef vector<int> vi;
  37.  
  38. const vlong inf = 2147383647;
  39. const double pi = 2 * acos ( 0.0 );
  40. const double eps = 1e-9;
  41.  
  42.  
  43. /***********Template Ends Here***********/
  44. struct {
  45. int n;
  46. }_g;
  47. pll point[1010];
  48.  
  49. vlong getArea ( int a, int b, int c ) {
  50. if ( b >= _g.n ) b -= _g.n;
  51. if ( c >= _g.n ) c -= _g.n;
  52. vlong res = point[a].ff * point[b].ss + point[b].ff * point[c].ss + point[c].ff * point[a].ss;
  53. res -= point[a].ff * point[c].ss + point[b].ff * point[a].ss + point[c].ff * point[b].ss;
  54. return ABS(res);
  55. }
  56.  
  57. int mxlimit[1010][1010];
  58.  
  59. int binarySearch ( int i, int j, int m , int n, vlong k ) {
  60.  
  61. ///First search between (j + 1) - m
  62. int low = j + 1, high = m;
  63.  
  64. ///Upper Bound
  65. while ( low <= high ) {
  66. int mid = ( low + high ) / 2;
  67.  
  68. vlong a = getArea( i, j, mid );
  69.  
  70. if ( a <= k ) {
  71. low = mid + 1;
  72. }
  73. else {
  74. high = mid - 1;
  75. }
  76. }
  77.  
  78. int res = ( low - j - 1 );
  79.  
  80. ///Now search between m+1 - (n-1)
  81. m = MAX(m+1,j+1);
  82.  
  83. if ( m >= n ) return res; ///No more segment
  84.  
  85. low = m; high = n - 1;
  86.  
  87. ///Lower Bound
  88. while ( low <= high ) {
  89. int mid = ( low + high ) / 2;
  90.  
  91. vlong a = getArea( i, j, mid );
  92.  
  93. if ( a <= k ) {
  94. high = mid - 1;
  95. }
  96. else {
  97. low = mid + 1;
  98. }
  99. }
  100.  
  101. res += ( n - 1 ) - low + 1;
  102.  
  103. return res;
  104. }
  105.  
  106. int main () {
  107. #ifdef forthright48
  108. freopen ( "input.txt", "r", stdin );
  109. //freopen ( "output.txt", "w", stdout );
  110. #endif // forthright48
  111.  
  112. int kase;
  113. scanf ( "%d", &kase );
  114.  
  115. while ( kase-- ) {
  116. int n;
  117. vlong lim;
  118. scanf ( "%d %lld", &n, &lim );
  119. lim *= 2;
  120. _g.n = n;
  121.  
  122. FOR(i,0,n-1){
  123. scanf ( "%lld %lld", &point[i].ff, &point[i].ss );
  124. }
  125.  
  126. if ( n <= 2 ) {
  127. printf ( "0\n" );
  128. continue;
  129. }
  130.  
  131.  
  132. ///Find the point which gives maximum area for given points (i,j)
  133. FOR(i,0,n-1){
  134. int s = i + 1; ///Initiate two pointer
  135. vlong prev = 0;
  136. FOR(f,i+1,n-1){
  137. prev = getArea( i, f, s );
  138. ///Make s go forward as much as possible
  139. while ( 1 ) {
  140. if ( s + 1 >= n ) break; ///Not possible to go forward
  141. vlong cur = getArea( i, f, s + 1 );
  142. if ( cur >= prev ) {
  143. prev = cur;
  144. s++;
  145. }
  146. else break;
  147. }
  148.  
  149. mxlimit[i][f] = s;
  150. }
  151. }
  152.  
  153. vlong res = 0;
  154.  
  155. ///Binary Search
  156. FOR(i,0,n-3){
  157. FOR(j,i+1,n-2){
  158. int m = mxlimit[i][j];
  159. res += binarySearch ( i, j, m, n, lim );
  160. }
  161. }
  162.  
  163. printf ( "%lld\n", res );
  164. }
  165.  
  166. return 0;
  167. }
  168.  
Runtime error #stdin #stdout 0.01s 7460KB
stdin
Standard input is empty
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