Compilare: main.cpp: In function 'int p1(char*)': main.cpp:51:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i(0); i < strlen(c); ++i) ~~^~~~~~~~~~~ main.cpp: In function 'long long unsigned int p2(int, int)': main.cpp:66:15: warning: unused variable 'M' [-Wunused-variable] long long M(MOD); ^ main.cpp: In function 'int main()': main.cpp:78:15: warning: unused variable 'd' [-Wunused-variable] char *c, *d; ^ main.cpp:72:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("spion.in", "r", stdin); ^ main.cpp:73:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("spion.out", "w", stdout); ^