Compilare: main.cpp: In function 'int main()': main.cpp:67:8: warning: unused variable 'i' [-Wunused-variable] ui i, dim = 0; ^ main.cpp:67:11: warning: unused variable 'dim' [-Wunused-variable] ui i, dim = 0; ^~~ main.cpp:68:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("substr.in","r",stdin); ^ main.cpp:69:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("substr.out","w",stdout); ^ main.cpp:71:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%u %u\n%s", &n, &k, S); ^