Compilare: user.cpp: In function ‘int main()’: user.cpp:54:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, n, m, op, a, b, ta, tb, cost=0, lg=0; ^ user.cpp:54:21: warning: unused variable ‘op’ [-Wunused-variable] int i, j, n, m, op, a, b, ta, tb, cost=0, lg=0; ^ user.cpp:54:25: warning: unused variable ‘a’ [-Wunused-variable] int i, j, n, m, op, a, b, ta, tb, cost=0, lg=0; ^ user.cpp:54:28: warning: unused variable ‘b’ [-Wunused-variable] int i, j, n, m, op, a, b, ta, tb, cost=0, lg=0; ^ user.cpp:55:32: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 2000, stdin); ^ user.cpp: In function ‘void read(int&)’: user.cpp:15:121: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] while((buff[pos] < '0' || buff[pos] > '9') && buff[pos]!='-') if(++pos == 2000) fread(buff, 1, 2000, stdin), pos = 0; ^ user.cpp:20:63: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++pos == 2000) fread(buff, 1, 2000, stdin), pos = 0; ^ user.cpp:27:63: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++pos == 2000) fread(buff, 1, 2000, stdin), pos = 0; ^