Compilare: user.cpp: In function ‘void Input()’: user.cpp:34:32: 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:35:25: 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 main()’: user.cpp:99:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&L,&R); ^ user.cpp: In function ‘int sgn(int)’: user.cpp:65:21: warning: ‘b’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(2 * pos >= a + b){ ~~^~~ user.cpp:66:12: warning: ‘a’ may be used uninitialized in this function [-Wmaybe-uninitialized] l1 = a; ~~~^~~ user.cpp: In function ‘int main()’: user.cpp:145:25: warning: ‘f’ may be used uninitialized in this function [-Wmaybe-uninitialized] res = sum0[f] - sum0[R] - (sum1[R] - sum1[L-1]); ~~~~~~^