Compilare: user.cpp: In function ‘void Read(int&)’: user.cpp:38:56: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if (++poz == DIM) fread(buff, 1, DIM, fin), poz = 0; ^ user.cpp:42:60: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if (++poz == DIM) fread(buff, 1, DIM, fin), poz = 0; ^ user.cpp: In function ‘void Input()’: user.cpp:85:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d\n",&N,&Q); ^ user.cpp:86:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%s",str); ^ user.cpp: In function ‘int sgn(int)’: user.cpp:116:20: warning: ‘b’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(2 * pos > a + b){ ~~^~~ user.cpp:117:12: warning: ‘a’ may be used uninitialized in this function [-Wmaybe-uninitialized] l1 = a; ~~~^~~ user.cpp: In function ‘int main()’: user.cpp:212:71: warning: ‘a’ may be used uninitialized in this function [-Wmaybe-uninitialized] res = min(res, (sum1[R] - sum1[L-1]) - (sum0[L-1] - sum0[a-1])); ~^~ user.cpp:179:8: warning: ‘pR’ may be used uninitialized in this function [-Wmaybe-uninitialized] l2 = pR; r2 = N; ~~~^~~~ user.cpp:178:16: warning: ‘pL’ may be used uninitialized in this function [-Wmaybe-uninitialized] l1 = 1; r1 = pL; ~~~^~~~ user.cpp:196:25: warning: ‘f’ may be used uninitialized in this function [-Wmaybe-uninitialized] res = sum0[f] - sum0[R] - (sum1[R] - sum1[L-1]); ~~~~~~^