Compilare: main.cpp: In function 'int findnum(int)': main.cpp:23:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | if( idx[i] > s[i].size() - length ) | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp:31:55: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | while( searched > copies[i][idx[i]] && idx[i] <= s[i].size() - length ) | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp:33:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | if( idx[i] > s[i].size() - length ) | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:45:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 45 | for( int j = 0; j < s[i].size(); j++ ) | ~~^~~~~~~~~~~~~ main.cpp:52:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 52 | for( int j = 0; j < s[i].size(); j++ ) copies[i][j] = nr[i][j]; | ~~^~~~~~~~~~~~~ main.cpp:58:33: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 58 | while( g == 0 && idx[0] <= s[0].size() - length ) | ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp:62:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 62 | for( int j = 0; j < s[i].size() - length; j++ ) nr[i][j] = 2 * nr[i][j] + ( s[i][j+length] - 'a' ); | ~~^~~~~~~~~~~~~~~~~~~~~~