Compilare: main.cpp: In function 'int main()': main.cpp:38:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(p1 < ones.size() && p3 < threes.size()) { ~~~^~~~~~~~~~~~~ main.cpp:38:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(p1 < ones.size() && p3 < threes.size()) { ~~~^~~~~~~~~~~~~~~ main.cpp:49:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(p1 < ones.size()) { ~~~^~~~~~~~~~~~~ main.cpp:55:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(p3 < threes.size()) { ~~~^~~~~~~~~~~~~~~ main.cpp:67:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(p2 < twos.size()) { ~~~^~~~~~~~~~~~~ main.cpp:76:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < ans[i].size(); j++) { ~~^~~~~~~~~~~~~~~ main.cpp:16:32: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &m); ^ main.cpp:21:30: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &x); ^