Compilare: main.c: In function 'main': main.c:13:13: warning: this 'if' clause does not guard... [-Wmisleading-indentation] if (i!=j && !a[i][j]); ^~ main.c:14:17: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' a[i][j]==INF; ^ main.c:14:24: warning: statement with no effect [-Wunused-value] a[i][j]==INF; ^ main.c:8:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d", &n); ^~~~~~~~~~~~~~~~~~~~~~ main.c:12:13: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf (fin, "%d", &a[i][j]); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~