Compilare: main.cpp: In function 'int main()': main.cpp:9:32: warning: unused variable 'ip' [-Wunused-variable] long long i,c1,c1square,c2,ip,factor1,factor2,divizor,minc2=-1; ^~ main.cpp:7:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pitagora2.in", "r", stdin); ^ main.cpp:8:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pitagora2.out","w",stdout); ^