Compilare: user.cpp: In function ‘int main()’: user.cpp:36:34: warning: unused variable ‘sgn’ [-Wunused-variable] int testCase, i, j, N, K, L, sgn, val; ^ user.cpp:36:39: warning: unused variable ‘val’ [-Wunused-variable] int testCase, i, j, N, K, L, sgn, val; ^ user.cpp:39:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &testCase); ^ user.cpp:41:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d %d\n", &N, &K); ^ user.cpp:44:32: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(STR, MAX_STR, in); ^