Compilare: main.cpp: In function 'int main()': main.cpp:8:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("expresie3.in","r",stdin); ^ main.cpp:9:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("expresie3.out","w",stdout); ^ main.cpp:11:26: warning: ignoring return value of 'char* fgets(char*, int, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fgets (v,20001,stdin); ^ main.cpp:86:18: warning: iteration 29 invokes undefined behavior [-Waggressive-loop-optimizations] if (con[i]!=50000) ~~~~~^ main.cpp:84:15: note: within this loop for (i=1;i<=30;i++) ~^~~~ main.cpp:14:15: warning: iteration 29 invokes undefined behavior [-Waggressive-loop-optimizations] con[i]=50000; ~~~~~~^~~~~~ main.cpp:13:16: note: within this loop for (i=1; i<=30; i++) ~^~~~