Compilare: main.cpp: In function 'void write()': main.cpp:137:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(a[l+1][pos]<nr && a[n-l][n-pos+2]==a[n-l][n-pos+1]) ~~~~~~~~~~~^~~ main.cpp: In function 'void read()': main.cpp:19:46: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d %d %d %d",&task,&n,&st,&dr); ^ main.cpp:25:37: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d",&a[i][j]); ^