Compilare: user.c: In function ‘main’: user.c:126:7: warning: implicit declaration of function ‘memset’ [-Wimplicit-function-declaration] memset(dist[i], 0, sizeof dist[i]); ^ user.c:126:7: warning: incompatible implicit declaration of built-in function ‘memset’ [enabled by default] user.c:120:23: warning: variable ‘ci’ set but not used [-Wunused-but-set-variable] int t, n, i, j, li, ci, lf, cf, k; ^ user.c:120:19: warning: variable ‘li’ set but not used [-Wunused-but-set-variable] int t, n, i, j, li, ci, lf, cf, k; ^ user.c:121:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &t); ^ user.c:123:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d ", &n); ^ user.c:125:12: warning: ignoring return value of ‘fgets’, declared with attribute warn_unused_result [-Wunused-result] fgets(s[i], n + 2, in); ^ user.c:141:18: warning: ‘cf’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(!(dist[lf][cf] & 1)) ^ user.c:141:18: warning: ‘lf’ may be used uninitialized in this function [-Wmaybe-uninitialized]