Compilare: main.cpp: In function 'std::vector<Complex> FFT(std::vector<Complex>&, int)': main.cpp:64:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < A.size(); i++){ ~~^~~~~~~~~~ main.cpp: In function 'void Solve(std::vector<double>, std::vector<double>)': main.cpp:123:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < A.size(); i++) ~~^~~~~~~~~~ main.cpp:130:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < B.size(); i++) ~~^~~~~~~~~~ main.cpp:143:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < X.size(); i++){ ~~^~~~~~~~~~ main.cpp:147:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i < C.size(); i++){ ~~^~~~~~~~~~ main.cpp: In function 'void Read()': main.cpp:93:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ main.cpp:101:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &r); ^ main.cpp:107:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &M); ^ main.cpp:110:24: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &r); ^ main.cpp: In function 'int main()': main.cpp:160:40: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("bacterii2.in", "r", stdin); ^ main.cpp:161:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("bacterii2.out", "w", stdout); ^ main.cpp:162:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &T); ^