Compilare: user.cpp: In function ‘void calc(int)’: user.cpp:29:10: warning: unused variable ‘nw’ [-Wunused-variable] int i, nw, lin, j, ii; ^ user.cpp: In function ‘int main()’: user.cpp:52:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d%d%d", &n, &k, &a, &b); ^ user.cpp:45:18: warning: ‘lin’ may be used uninitialized in this function [-Wmaybe-uninitialized] rez += d[lin][x]; ^ user.cpp:29:14: note: ‘lin’ was declared here int i, nw, lin, j, ii; ^