Compilare: main.cpp: In function 'void fft(std::vector<Complex>&, int)': main.cpp:95:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Complex>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 95 | for (int i = 0; i < pol.size(); ++i) | ~~^~~~~~~~~~~~ main.cpp:99:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Complex>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 99 | for (int len = 1; len < pol.size(); len*= 2) { | ~~~~^~~~~~~~~~~~ main.cpp:102:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Complex>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 102 | for (int pos = 0; pos < pol.size(); pos+= len * 2) { | ~~~~^~~~~~~~~~~~ main.cpp:113:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Complex>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 113 | for (int i = 0; i < pol.size(); ++i) | ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:131:21: warning: comparison of integer expressions of different signedness: 'std::vector<Complex>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 131 | while (v1.size() <= t) | ~~~~~~~~~~^~~~ main.cpp:137:21: warning: comparison of integer expressions of different signedness: 'std::vector<Complex>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 137 | while (v2.size() <= t) | ~~~~~~~~~~^~~~ main.cpp:143:32: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses] 143 | while (v1.size() & v1.size() - 1) | ~~~~~~~~~~^~~ main.cpp:149:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Complex>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 149 | for (int i = 0; i < v1.size(); ++i) | ~~^~~~~~~~~~~ main.cpp:153:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<Complex>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 153 | for (int i = 0; i < v1.size(); ++i) | ~~^~~~~~~~~~~