Compilare: main.cpp: In function 'int main()': main.cpp:73:51: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(r[i][j]==ju[i][j]&&r[i][j]&&r[i][j]<min) ~~~~~~~^~~~ main.cpp: In function 'void read()': main.cpp:17:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d %d",&n,&m); ^