Compilare: user.cpp: In function ‘int main()’: user.cpp:66:84: warning: array subscript has type ‘char’ [-Wchar-subscripts] dp[conf] = std::min(dp[conf], dp[aux] + cst[bits[i]][bits[j]][bits[k]]); ^ user.cpp:66:93: warning: array subscript has type ‘char’ [-Wchar-subscripts] dp[conf] = std::min(dp[conf], dp[aux] + cst[bits[i]][bits[j]][bits[k]]); ^ user.cpp:66:102: warning: array subscript has type ‘char’ [-Wchar-subscripts] dp[conf] = std::min(dp[conf], dp[aux] + cst[bits[i]][bits[j]][bits[k]]); ^ user.cpp:34:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d " ,&n); ^ user.cpp:36:51: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%lf %lf " ,&pts[i].x,&pts[i].y); ^