Compilare: main.cpp: In function 'int main()': main.cpp:43:9: warning: variable 's3' set but not used [-Wunused-but-set-variable] int s2,s3; ^~ main.cpp:6:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("sume.in", "r", stdin); ^ main.cpp:7:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("sume.out", "w", stdout); ^