Compilare: user.cpp: In function ‘int main()’: user.cpp:39:9: warning: variable ‘m’ set but not used [-Wunused-but-set-variable] int m, n; ^ user.cpp:40:9: warning: unused variable ‘dmax’ [-Wunused-variable] int dmax = -1, distc, i1, i2; ^ user.cpp:40:20: warning: unused variable ‘distc’ [-Wunused-variable] int dmax = -1, distc, i1, i2; ^ user.cpp:40:27: warning: unused variable ‘i1’ [-Wunused-variable] int dmax = -1, distc, i1, i2; ^ user.cpp:40:31: warning: unused variable ‘i2’ [-Wunused-variable] int dmax = -1, distc, i1, i2; ^ user.cpp:43:12: warning: unused variable ‘maxl’ [-Wunused-variable] int i, maxl, maxd, md = -1, ml =-1; ^ user.cpp:43:24: warning: variable ‘md’ set but not used [-Wunused-but-set-variable] int i, maxl, maxd, md = -1, ml =-1; ^ user.cpp:43:33: warning: unused variable ‘ml’ [-Wunused-variable] int i, maxl, maxd, md = -1, ml =-1; ^ user.cpp: In function ‘char nextch()’: user.cpp:11:58: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(pos==BUF_SIZE) fread(buf, BUF_SIZE, 1, fin), pos=0; ^ user.cpp: In function ‘int main()’: user.cpp:59:37: warning: ‘maxd’ may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(fout, "%d", a + b - maxd); ^