Compilare: main.cpp: In function 'int main()': main.cpp:31:18: warning: operation on 'A[i][0]' may be undefined [-Wsequence-point] A[0][i]=A[i][0]=A[i][n+1]=A[i][0]=-1; ~~~~~~~^~~~~~~~~~~~~~~~~~~~~ main.cpp:15:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d %d",&n,&m); ^ main.cpp:18:21: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d",&x); ^ main.cpp:24:28: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d",&A[i][j]); ^