Submission #3482

#TimeUsernameProblemLanguageResultExecution timeMemory
3482hhosu107Divide into triangle (kriii1_D)C++98
Compilation error
0 ms0 KiB
#include<stdio.h> #include<math.h> #define PI (4*atan(1.0)) int N; int no[900]; int dot[900][2]; double angle[900]; int temp; double temp2; void swap(int *, int *); void swap2(double *, double *); int main(){ int i = 0; scanf("%d", &N); while(N--){ do{ scanf("%d %d", &dot[i][0], &dot[i][1]); angle[i] = atan2((double)dot[i][1], (double)dot[i][0]); if(angle[i] < 0.0) angle[i] += 2 * PI; i++; no[i - 1] = i; }while(i % 3); } int j, k; for(j = 0; j < i - 1; j++){ for(k = j + 1; k < i; k++){ if(angle[j] > angle[k]){ swap2(&angle[j], &angle[k]); swap(&dot[j][0], &dot[k][0]); swap(&dot[j][1], &dot[k][1]); swap(&no[j], &no[k]); } else if(angle[j] == angle[k]){ if(abs(dot[j][0]) > abs(dot[k][0])){ swap2(&angle[j], &angle[k]); swap(&dot[j][0], &dot[k][0]); swap(&dot[j][1], &dot[k][1]); swap(&no[j], &no[k]); } } } } j = 0; do{ printf("%d %d %d\n", no[3 * j], no[3 * j + 1], no[3 * j + 2]); j++; }while(j * 3 != i); return 0; } void swap(int *x, int *y){ int temp; temp = *x; *x = *y; *y = temp; } void swap2(double *x, double *y){ double temp; temp = *x; *x = *y; *y = temp; }

Compilation message (stderr)

D.cpp: In function 'int main()':
D.cpp:40:21: error: 'abs' was not declared in this scope
D.cpp:19:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
D.cpp:22:42: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]