Compilare: main.cpp: In function 'int main()': main.cpp:31:33: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d ",&c,&n,&m); ^ main.cpp:33:26: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets(mat[i]+1,N,fin); ^ main.cpp:79:10: warning: 'cmax' may be used uninitialized in this function [-Wmaybe-uninitialized] fprintf(fout,"%d %d\n%c",xmax,ymax,cmax); ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~