Compilare: main.cpp: In function 'int main()': main.cpp:17:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a.length();i++) ~^~~~~~~~~~~ main.cpp:24:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a.length();i++) ~^~~~~~~~~~~ main.cpp:29:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<q.length();i++) ~^~~~~~~~~~~ main.cpp:30:27: warning: array subscript has type 'char' [-Wchar-subscripts] if(letter[q[i]].size()==0) {printf("0"); continue;} ^ main.cpp:37:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a.length();i++) ~^~~~~~~~~~~ main.cpp:44:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(cr==q.length()) {pus=1; break;} ~~^~~~~~~~~~~~ main.cpp:14:27: warning: unused variable 'x' [-Wunused-variable] int val,cr,va,n,k,i,j,x; ^ main.cpp:12:38: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("balbaiala.in","r",stdin); ^ main.cpp:13:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("balbaiala.out","w",stdout); ^ main.cpp:15:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d\n",&n,&k); ^