Compilare: main.cpp: In function 'int main()': main.cpp:69:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(d1.size()>=l) { ~~~~~~~~~^~~ main.cpp:93:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<d1.size(); i++) ~^~~~~~~~~~ main.cpp:96:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<d2.size(); i++) ~^~~~~~~~~~ main.cpp:25:10: warning: unused variable 'pas' [-Wunused-variable] bool pas=0; ^~~ main.cpp:7:32: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pal.in","r",stdin); ^ main.cpp:8:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("pal.out","w",stdout); ^ main.cpp:10:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&l); ^ main.cpp:12:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&f[i]); ^