Compilare: user.cpp: In function ‘int check(int)’: user.cpp:23:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < target.size() && pos < s.size() && s[pos] == target[i]) { ~~^~~~~~~~~~~~~~~ user.cpp:23:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < target.size() && pos < s.size() && s[pos] == target[i]) { ~~~~^~~~~~~~~~ user.cpp:27:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i == target.size()) ~~^~~~~~~~~~~~~~~~ user.cpp:29:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pos < s.size() && i < target.size() && s[pos] < target[i]) ~~~~^~~~~~~~~~ user.cpp:29:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(pos < s.size() && i < target.size() && s[pos] < target[i]) ~~^~~~~~~~~~~~~~~ user.cpp: In function ‘int bs(int)’: user.cpp:37:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ans + step < s.size() && check(sol[ans + step].z) < lim) ~~~~~~~~~~~^~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:52:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < s.size(); i ++) ~~^~~~~~~~~~ user.cpp:54:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; (1 << (i-1)) < s.size(); i ++) { ~~~~~~~~~~~~~^~~~~~~~~~ user.cpp:56:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j < s.size(); j ++) { ~~^~~~~~~~~~ user.cpp:65:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 1; j < s.size(); j ++) { ~~^~~~~~~~~~