Compilare: user.c: In function ‘main’: user.c:9:1: warning: implicit declaration of function ‘memset’ [-Wimplicit-function-declaration] memset(frecv, 0, 10 * 10 * sizeof(int)); ^ user.c:9:1: warning: incompatible implicit declaration of built-in function ‘memset’ [enabled by default] user.c:14:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%d", &N); ^ user.c:15:7: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%d", &K); ^ user.c:18:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(file1, "%d", &number); ^