Compilare: user.cpp: In function ‘int main()’: user.cpp:273:31: warning: suggest parentheses around assignment used as truth value [-Wparentheses] if (j = pairedWithL[i]) { ^ user.cpp:242:36: warning: unused variable ‘k’ [-Wunused-variable] int edges, i, j, answer, x, y, k; ^ user.cpp:243:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &n, &edges); ^ user.cpp:247:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &i, &j); ^