Compilare: main.cpp: In function 'void calcul_rest()': main.cpp:94:11: warning: statement has no effect [-Wunused-value] for(lg; lg <= N; lg<<=1); ^ main.cpp:105:19: warning: statement has no effect [-Wunused-value] for(lg; lg <= N; lg<<=1); ^ main.cpp: In function 'void c1()': main.cpp:27:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s", s); ^ main.cpp: In function 'void c2()': main.cpp:116:19: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%s", s); ^ main.cpp:178:34: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &a, &b, &E); ^ main.cpp: In function 'int main()': main.cpp:186:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("eq4.in", "r", stdin); ^ main.cpp:187:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("eq4.out", "w", stdout); ^ main.cpp:188:22: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d\n", &c); ^