Compilare: user.cpp: In function ‘int main()’: user.cpp:51:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(idx[i] != a[i].size()) ^ user.cpp:57:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(idx[x] == a[x].size()) --vf; ^ user.cpp:60:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(idx[y] != a[y].size()) stiva[++vf] = y; ^ user.cpp:20:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&N,&K); ^ user.cpp:23:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d %d",&l,&c); ^ user.cpp:24:29: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin," %c",&p); ^ user.cpp:27:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%s",t); ^ user.cpp:44:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%c",&p); ^