Compilare: main.cpp: In function 'int main()': main.cpp:26:1: warning: this 'for' clause does not guard... [-Wmisleading-indentation] for(i=1;i<=n;i++) ^~~ main.cpp:29:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for' for(i1=1;i1<=n;i1++) ^~~ main.cpp:25:18: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(f,"%d",&n); ^ main.cpp:28:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] {fscanf(f,"%d",&a[i][j]);al[i][j]=1;} ^