Compilare: main.cpp: In function 'int main()': main.cpp:11:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d",&n); ^ main.cpp:15:12: warning: 's' may be used uninitialized in this function [-Wmaybe-uninitialized] s+=j-1; ~^~~~~