Compilare: main.cpp: In function 'int main()': main.cpp:61:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<pal.size();i++) ~^~~~~~~~~~~ main.cpp:64:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sec.size();i++) ~^~~~~~~~~~~ main.cpp:100:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<pal.size();i++) ~^~~~~~~~~~~ main.cpp:103:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sec.size();i++) ~^~~~~~~~~~~ main.cpp:136:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<pal.size();i++) ~^~~~~~~~~~~ main.cpp:139:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sec.size();i++) ~^~~~~~~~~~~ main.cpp:11:32: 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:12:34: 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:16:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&l); ^ main.cpp:18:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&f[i]); ^