Compilare: main.cpp: In function 'int main()': main.cpp:42:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 42 | if(p - i > b.size()) continue; | ~~~~~~^~~~~~~~~~ main.cpp:44:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 44 | if(p - j > b.size()) continue; | ~~~~~~^~~~~~~~~~ main.cpp:50:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | if(pi >= 0 && pj < a.size() && a[pi] == a[pj]) dp[p][i][j] += dp[p - 1][i - 1][j - 1]; | ~~~^~~~~~~~~~ main.cpp:51:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 51 | if(pi >= 0 && pj2 < b.size() && a[pi] == b[pj2]) dp[p][i][j] += dp[p - 1][i - 1][j]; | ~~~~^~~~~~~~~~ main.cpp:52:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 52 | if(pi2 >= 0 && pj < a.size() && b[pi2] == a[pj]) dp[p][i][j] += dp[p - 1][i][j - 1]; | ~~~^~~~~~~~~~ main.cpp:53:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 53 | if(pi2 >= 0 && pj2 < b.size() && b[pi2] == b[pj2]) dp[p][i][j] += dp[p - 1][i][j]; | ~~~~^~~~~~~~~~ main.cpp:64:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | if(nr_op - i > b.size() || nr_op - j > b.size()) continue; | ~~~~~~~~~~^~~~~~~~~~ main.cpp:64:50: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | if(nr_op - i > b.size() || nr_op - j > b.size()) continue; | ~~~~~~~~~~^~~~~~~~~~ main.cpp:65:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 65 | if(2 * nr_op - i - j > b.size()) continue; | ~~~~~~~~~~~~~~~~~~^~~~~~~~~~ main.cpp:22:9: warning: unused variable 'm' [-Wunused-variable] 22 | int m = b.size(); | ^