Compilare: main.cpp: In function 'int main()': main.cpp:9:18: warning: unused variable 'par' [-Wunused-variable] int n, k, i, par, imp; ^~~ main.cpp:9:23: warning: unused variable 'imp' [-Wunused-variable] int n, k, i, par, imp; ^~~ main.cpp:7:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cardinal.in", "r", stdin); ^ main.cpp:8:41: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("cardinal.out", "w", stdout); ^ main.cpp:10:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &k); ^ main.cpp:13:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^