Compilare: user.c: In function ‘suma’: user.c:17:23: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if (!l[i] && !c[j] || l[i] && c[j]) ^ user.c: In function ‘back’: user.c:38:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^ user.c: In function ‘main’: user.c:55:5: warning: format ‘%d’ expects argument of type ‘int *’, but argument 3 has type ‘char *’ [-Wformat=] fscanf(f, "%d", &n); ^ user.c:56:5: warning: format ‘%d’ expects argument of type ‘int *’, but argument 3 has type ‘char *’ [-Wformat=] fscanf(f, "%d", &m); ^ user.c:61:13: warning: format ‘%d’ expects argument of type ‘int *’, but argument 3 has type ‘char *’ [-Wformat=] fscanf(f, "%d", &v[i][j]); ^ user.c:55:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &n); ^ user.c:56:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &m); ^ user.c:61:19: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &v[i][j]); ^