Compilare: main.cpp: In function 'void write()': main.cpp:49:36: warning: format '%d' expects argument of type 'int', but argument 2 has type 'std::vector<int>::size_type {aka long unsigned int}' [-Wformat=] printf("%d ", out[i].size()); ^ main.cpp: In function 'void euler(int)': main.cpp:63:5: warning: this 'if' clause does not guard... [-Wmisleading-indentation] if(!cnt) return; ++nrsol; ^~ main.cpp:63:22: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if' if(!cnt) return; ++nrsol; ^~ main.cpp: In function 'void read()': main.cpp:27:37: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("johnie.in", "r", stdin); ^ main.cpp:28:26: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &m); ^ main.cpp:32:30: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^ main.cpp: In function 'void write()': main.cpp:46:39: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("johnie.out", "w", stdout); ^