Compilare: main.c: In function 'main': main.c:25:5: warning: implicit declaration of function 'memset' [-Wimplicit-function-declaration] memset(mat, 0, n * m * sizeof(int)); ^~~~~~ main.c:25:5: warning: incompatible implicit declaration of built-in function 'memset' main.c:25:5: note: include '<string.h>' or provide a declaration of 'memset' main.c:13:5: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d %d", &n, &m); ^~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:18:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &v1[i]); ^~~~~~~~~~~~~~~~~~~~~~~ main.c:22:9: warning: ignoring return value of 'fscanf', declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &v2[j]); ^~~~~~~~~~~~~~~~~~~~~~~