Compilare: user.cpp: In function ‘int main()’: user.cpp:78:24: warning: format ‘%s’ expects argument of type ‘char*’, but argument 3 has type ‘char (*)[100001]’ [-Wformat=] fscanf (fin, "%s", &s); ^ user.cpp:77:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d", &c); ^ user.cpp:78:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%s", &s); ^ user.cpp:81:39: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d%d%lld", &a, &b, &E); ^ user.cpp: In function ‘void eval()’: user.cpp:45:7: warning: ‘nr’ may be used uninitialized in this function [-Wmaybe-uninitialized] if (nr == -1) { ^~ user.cpp:42:22: warning: ‘semn’ may be used uninitialized in this function [-Wmaybe-uninitialized] ss = ss + nr * semn; ~~~^~~~~~