Compilare: main.cpp: In function 'int prim(int)': main.cpp:9:5: warning: this 'else' clause does not guard... [-Wmisleading-indentation] else ^~~~ main.cpp:13:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else' return 1; ^~~~~~ main.cpp: In function 'int main()': main.cpp:63:42: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("inversmodular.in","r",stdin); ^ main.cpp:64:44: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("inversmodular.out","w",stdout); ^