Compilare: main.cpp: In function 'void solve()': main.cpp:47:33: warning: unused variable 'ind' [-Wunused-variable] int aux, cate=0, max_extra, ind, i, j, sum=0, sum2=0; ^~~ main.cpp:47:38: warning: unused variable 'i' [-Wunused-variable] int aux, cate=0, max_extra, ind, i, j, sum=0, sum2=0; ^ main.cpp:47:41: warning: unused variable 'j' [-Wunused-variable] int aux, cate=0, max_extra, ind, i, j, sum=0, sum2=0; ^ main.cpp: In function 'void read()': main.cpp:24:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d)",&n,&m); ^ main.cpp:27:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&x,&y); ^