Compilare: user.cpp: In function ‘int main()’: user.cpp:32:19: warning: unused variable ‘c’ [-Wunused-variable] int n, m, p, l, c, x, y, ans, k; ^ user.cpp:32:22: warning: unused variable ‘x’ [-Wunused-variable] int n, m, p, l, c, x, y, ans, k; ^ user.cpp:32:25: warning: unused variable ‘y’ [-Wunused-variable] int n, m, p, l, c, x, y, ans, k; ^ user.cpp:34:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d%d", &n, &m, &p); ^ user.cpp:36:62: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d%d%d%d", &a[i].y, &a[i].x, &b[i].y, &b[i].x); ^