Compilare: user.cpp: In function ‘int main()’: user.cpp:107:10: warning: variable ‘c’ set but not used [-Wunused-but-set-variable] char c, prev = 'a' - TAJK; ^ user.cpp:113:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d %d\n", &V, &N, &M); ^ user.cpp:168:54: warning: ‘answer’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(f, "%d %d\n%c\n", L, C, answer + prev); ^